ubiquitin-like (Ubl) domain found in UV excision repair protein RAD23 homolog A (HR23A); HR23A, also termed RAD23A, is a DNA repair protein that binds to 19S subunit of the 26S proteasome and shuttles ubiquitinated proteins to the proteasome for degradation, which is required for efficient nucleotide excision repair (NER), a primary mechanism for removing UV-induced DNA lesions. HR23A also plays a critical role in the interaction of HIV-1 viral protein R (Vpr) with the proteasome, especially facilitating Vpr to promote protein poly-ubiquitination. HR23A contains an N-terminal ubiquitin-like (Ubl) domain that binds proteasomes and two C-terminal ubiquitin-associated (UBA) domains that bind ubiquitin or multi-ubiquitinated substrates. In addition, it has a XPC protein-binding domain that might be necessary for its efficient NER function.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 4826964    3 VTITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGRDAFPVAGQKLIYAGKILSDDVPIRDYRIDEKNFVVVMVTK 78
Cdd:cd17126   1 VTITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGRDAFPVAGQKLIYAGKILSDDVPIRDYRIDEKNFVVVMVTK 76

Ubiquitin family; This family contains a number of ubiquitin-like proteins: SUMO (smt3 homolog), Nedd8, Elongin B, Rub1, and Parkin. A number of them are thought to carry a distinctive five-residue motif termed the proteasome-interacting motif (PIM), which may have a biologically significant role in protein delivery to proteasomes and recruitment of proteasomes to transcription sites.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 4826964      5 ITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGrdaFPVAGQKLIYAGKILSDDVPIRDYRIDEKNFVVVMVTKT 79
Cdd:pfam00240   1 ITVKTLDGKKITLEVDPTDTVLELKEKIAEKEG---VPPEQQRLIYSGKVLEDDQTLGEYGIEDGSTIHLVLRQR 72

ubiquitin-like (Ubl) domain found in UV excision repair protein RAD23 homolog A (HR23A); HR23A, also termed RAD23A, is a DNA repair protein that binds to 19S subunit of the 26S proteasome and shuttles ubiquitinated proteins to the proteasome for degradation, which is required for efficient nucleotide excision repair (NER), a primary mechanism for removing UV-induced DNA lesions. HR23A also plays a critical role in the interaction of HIV-1 viral protein R (Vpr) with the proteasome, especially facilitating Vpr to promote protein poly-ubiquitination. HR23A contains an N-terminal ubiquitin-like (Ubl) domain that binds proteasomes and two C-terminal ubiquitin-associated (UBA) domains that bind ubiquitin or multi-ubiquitinated substrates. In addition, it has a XPC protein-binding domain that might be necessary for its efficient NER function.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 4826964    3 VTITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGRDAFPVAGQKLIYAGKILSDDVPIRDYRIDEKNFVVVMVTK 78
Cdd:cd17126   1 VTITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGRDAFPVAGQKLIYAGKILSDDVPIRDYRIDEKNFVVVMVTK 76

ubiquitin-like (Ubl) domain found in UV excision repair protein RAD23 homolog B (HR23B); HR23B, also termed xeroderma pigmentosum group C (XPC) repair-complementing complex 58 kDa protein (p58), is tightly complexed with XPC protein to form the XPC-HR23B complex. Although it displays a high affinity for both single- and double-stranded DNA, the XPC-HR23B complex functions as a global genome repair (GGR)-specific repair factor that is specifically involved in global genome but not transcription-coupled nucleotide excision repair (NER). HR23B also interacts specifically with S5a subunit of the human 26S proteasome, and plays an important role in shuttling ubiquitinated cargo proteins to the proteasome. HR23B contains an N-terminal ubiquitin-like (Ubl) domain that binds proteasomes and two C-terminal ubiquitin-associated (UBA) domains that bind ubiquitin or multi-ubiquitinated substrates. In addition, it has a XPC protein-binding domain that might be necessary for its efficient NER function.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 4826964    5 ITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGRDAFPVAGQKLIYAGKILSDDVPIRDYRIDEKNFVVVMVTKTK 80
Cdd:cd16126   3 ITLKTLQQQTFKIDIDPEETVKALKEKIESEKGKDAFPVAGQKLIYAGKILNDDTALKEYKIDEKNFVVVMVTKPK 78

UBA1 domain of Rad23 proteins found in metazoa; The family includes mammalian orthologs of yeast nucleotide excision repair (NER) proteins, Rad23p (in Saccharomyces cerevisiae) and Rhp23p (in Schizosaccharomyces pombe). Rad23 proteins play dual roles in DNA repair as well as in proteosomal degradation. They have affinity for both the proteasome and ubiquitinylated proteins and participate in translocating polyubiquitinated proteins to the proteasome. Rad23 proteins carry a ubiquitin-like (UBL) and two ubiquitin-associated (UBA) domains, as well as a xeroderma pigmentosum group C (XPC) protein-binding domain. UBL domain is responsible for the binding to proteasome. UBA domains are important for binding of ubiquitin (Ub) or multi-ubiquitinated substrates which suggests Rad23 proteins might be involved in certain pathways of ubiquitin metabolism. Both UBL domain and XPC-binding domain are necessary for efficient NER function of Rad23 proteins. This model corresponds to the UBA1 domain.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|
gi 4826964  162 EYETMLTEIMSMGYERERVVAALRASYNNPHRAVEYLLTG 201
Cdd:cd14377   1 EYENMVTEIMSMGFERDQVVRALRASFNNPDRAVEYLLSG 40

Ubiquitin homologues; Ubiquitin-mediated proteolysis is involved in the regulated turnover of proteins required for controlling cell cycle progression

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 4826964       3 VTITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGRdafPVAGQKLIYAGKILSDDVPIRDYRIDEKNFVVVMVT 77
Cdd:smart00213   1 IELTVKTLDGKTITLEVKPSDTVSELKEKIAELTGI---PPEQQRLIYKGKVLEDDRTLADYGIQDGSTIHLVLR 72

UBA2 domain of UV excision repair protein RAD23 homolog B (HR23B) found in vertebrates; HR23B, also called xeroderma pigmentosum group C (XPC) repair-complementing complex 58 kDa protein (p58), is tightly complexed with XPC protein to form the XPC-HR23B complex. Although it displays a high affinity for both single- and double-stranded DNA, the XPC-HR23B complex functions as a global genome repair (GGR)-specific repair factor that is specifically involved in global genome but not transcription-coupled nucleotide excision repair (NER). HR23B also interacts specifically with S5a subunit of the human 26 S proteasome, and plays an important role in shuttling ubiquitinated cargo proteins to the proteasome. HR23B contains an N-terminal ubiquitin-like (UBL) domain that binds proteasomes and two C-terminal ubiquitin-associated (UBA) domains that bind ubiquitin or multi-ubiquitinated substrates. In addition, it has a XPC protein-binding domain that might be necessary for its efficient NER function. This model corresponds to the UBA2 domain.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|....*
gi 4826964  319 QEKEAIERLKALGFPESLVIQAYFACEKNENLAANFLLSQNFDDE 363
Cdd:cd14428   1 QEKEAIERLKALGFPEGLVIQAYFACEKNENLAANFLLQQNFDDD 45

UBA1 domain of Rad23 proteins found in eukaryotes; The Rad23 family includes the yeast nucleotide excision repair (NER) proteins, Rad23p (in Saccharomyces cerevisiae) and Rhp23p (in Schizosaccharomyces pombe), their mammalian orthologs HR23A and HR23B, and putative DNA repair proteins from plants. Rad23 proteins play dual roles in DNA repair as well as in proteosomal degradation. They have affinity for both the proteasome and ubiquitinylated proteins and participate in translocating polyubiquitinated proteins to the proteasome. Rad23 proteins carry a ubiquitin-like (UBL) and two ubiquitin-associated (UBA) domains, as well as a xeroderma pigmentosum group C (XPC) protein-binding domain. UBL domain is responsible for the binding to proteasome. UBA domains are important for binding of ubiquitin (Ub) or multi-ubiquitinated substrates which suggests Rad23 proteins might be involved in certain pathways of ubiquitin metabolism. Both UBL domain and XPC-binding domain are necessary for efficient NER function of Rad23 proteins. This model corresponds to the UBA1 domain.

                        10        20        30
                ....*....|....*....|....*....|....*....
gi 4826964  162 EYETMLTEIMSMGYERERVVAALRASYNNPHRAVEYLLT 200
Cdd:cd14280   1 ELEATINNIMSMGFEREQVVRALRAAFNNPDRAVEYLLS 39

UBA1 domain of UV excision repair protein RAD23 homolog A (HR23A) found in vertebrates; HR23A, also called Rad23A, is a DNA repair protein that binds to 19S subunit of the 26S proteasome and shuttles ubiquitinated proteins to the proteasome for degradation which is required for efficient nucleotide excision repair (NER), a primary mechanism for removing UV-induced DNA lesions. HR23A also plays a critical role in the interaction of HIV-1 viral protein R (Vpr) with proteasome, especially facilitating Vpr to promote protein poly-ubiquitination. HR23A contains an N-terminal ubiquitin-like (UBL) domain that binds proteasomes and two C-terminal ubiquitin-associated (UBA) domains that bind ubiquitin or multi-ubiquitinated substrates. In addition, it has a XPC protein-binding domain that might be necessary for its efficient NER function. This model corresponds to the UBA1 domain.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|
gi 4826964  162 EYETMLTEIMSMGYERERVVAALRASYNNPHRAVEYLLTG 201
Cdd:cd14425   1 EYETMLTEIMSMGYERERVVAALRASYNNPHRAVEYLLTG 40

UBA2 domain of Rad23 proteins found in eukaryotes; The Rad23 family includes the yeast nucleotide excision repair (NER) proteins, Rad23p (in Saccharomyces cerevisiae) and Rhp23p (in Schizosaccharomyces pombe), their mammalian orthologs HR23A and HR23B, and putative DNA repair proteins from plants. Rad23 proteins play dual roles in DNA repair as well as in proteosomal degradation. They have affinity for both the proteasome and ubiquitinylated proteins and participate in translocating polyubiquitinated proteins to the proteasome. Rad23 proteins carry a ubiquitin-like (UBL) and two ubiquitin-associated (UBA) domains, as well as a xeroderma pigmentosum group C (XPC) protein-binding domain. UBL domain is responsible for the binding to proteasome. UBA domains are important for binding of ubiquitin (Ub) or multi-ubiquitinated substrates which suggests Rad23 proteins might be involved in certain pathways of ubiquitin metabolism. Both UBL domain and XPC-binding domain are necessary for efficient NER function of Rad23 proteins. This model corresponds to the UBA2 domain.

                        10        20        30
                ....*....|....*....|....*....|....*...
gi 4826964  319 QEKEAIERLKALGFPESLVIQAYFACEKNENLAANFLL 356
Cdd:cd14281   1 EEREAIERLVALGFSRDQAIEAYLACDKNEELAANYLF 38

UBA1 domain of putative DNA repair proteins Rad23 found in plant; The radiation sensitive 23 (Rad23) subfamily consists of four isoforms of putative DNA repair proteins from Arabidopsis thaliana and similar proteins from other plants. The nuclear-enriched Rad23 proteins function in the cell cycle, morphology, and fertility of plants through their delivery of ubiquitin (Ub)/26S proteasome system (UPS) substrates to the 26S proteasome. Rad23 proteins contain an N-terminal ubiquitin-like (UBL) domain that associates with the 26S proteasome Ub receptor RPN10, and two C-terminal ubiquitin-associated (UBA) domains that bind Ub conjugates. This model corresponds to the UBA1 domain.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|
gi 4826964  157 LVTGSEYETMLTEIMSMG---YERERVVAALRASYNNPHRAVEYLLTGIP 203
Cdd:cd14379   1 LVAGSSLEQTVQQIMDMGggsWDRDTVVRALRAAYNNPERAVEYLYSGIP 50

UBA2 domain of Schizosaccharomyces pombe UV excision repair protein Rhp23p and its fungal homologs; The subfamily contains several fungal multiubiquitin receptors, including Schizosaccharomyces pombe Rhp23p and Saccharomyces cerevisiae Rad23p, both of which are orthologs of human HR23A. They play roles in nucleotide excision repair (NER) and in cell cycle regulation. They also function as shuttle proteins transporting ubiquitinated substrates destined for degradation from the E3 ligase to the 26S proteasome. For instance, S. pombe Rhp23p forms a complex with Rhp41p to recognize photolesions and help initiate DNA repair, and it also protects ubiquitin chains against disassembly by deubiquitinating enzymes. Like human HR23A, members in this subfamily interact with the proteasome through their N-terminal ubiquitin-like domain (UBL), and with ubiquitin (Ub), or multi-ubiquitinated substrates, through their two ubiquitin-associated domains (UBA), termed internal UBA1 and C-terminal UBA2. In addition, they contain a xeroderma pigmentosum group C (XPC) protein-binding domain that might be necessary for its efficient NER function. This model corresponds to the UBA2 domain.

                        10        20        30
                ....*....|....*....|....*....|....*....
gi 4826964  319 QEKEAIERLKALGFPESLVIQAYFACEKNENLAANFLLS 357
Cdd:cd14381   1 EEDQAIDRLCELGFDRDLVIQAYLACDKNEEMAANFLFE 39

ubiquitin-like (Ubl) domain found in Saccharomyces cerevisiae proteasome interacting protein Dsk2p and similar proteins; The family contains several fungal multiubiquitin receptors, including Saccharomyces cerevisiae Dsk2p and Schizosaccharomyces pombe Dph1p, both of which have been characterized as shuttle proteins transporting ubiquitinated substrates destined for degradation from the E3 ligase to the 26S proteasome. They interact with the proteasome through their N-terminal ubiquitin-like domain (Ubl) and with ubiquitin (Ub) through their C-terminal Ub-associated domain (UBA). S. cerevisiae Dsk2p is a nuclear-enriched protein that may involve in the ubiquitin-proteasome proteolytic pathway through interacting with K48-linked polyubiquitin and the proteasome. Moreover, it has been implicated in spindle pole duplication through assisting in Cdc31 assembly into the new spindle pole body (SPB). S. pombe Dph1p is an ubiquitin (Ub0 receptor working in concert with the class V myosin, Myo52, to target the degradation of the S. pombe CLIP-170 homolog, Tip1. It also can protect Ub chains against disassembly by deubiquitinating enzymes.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 4826964    3 VTITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGrdaFPVAGQKLIYAGKILSDDVPIRDYRIdEKNFVVVMV 76
Cdd:cd16106   1 IKVTVKCSNGKKFTVEVEPDATVLELKELIAEKSD---IPAEQQRLIYKGKILKDEETLSSYKI-QDGHTVHLV 70

ubiquitin-like (Ubl) domain found in neural precursor cell expressed developmentally down-regulated protein 8 (NEDD8) and similar proteins; NEDD8, also termed Neddylin, or RELATED TO UBIQUITIN (RUB/Rub1p) in plant and yeast, is a ubiquitin-like protein that conjugates to nuclear proteins in a manner analogous to ubiquitination and sentrinization. It modifies a family of molecular scaffold proteins called cullins that are responsible for assembling the ROC1/Rbx1 RING-based E3 ubiquitin ligases, of which several play a direct role in tumorigenesis. NEDD8 deamidation and its inhibition of Cullin-RING ubiquitin ligases (CRLs) activity are responsible for Cycle-inhibiting factor (Cif)/Cif homolog in Burkholderia pseudomallei (CHBP)-induced cytopathic effect. NEDD8 contains a single conserved ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, a common structure involved in protein-protein interactions. Polyubiquitination, signals for a diverse set of cellular events via different isopeptide linkages formed between the C terminus of one ubiquitin (Ub) and the epsilon-amine of K6, K11, K27, K29, K33, K48, or K63 of a second Ub. Ubl NEDD8, contains many of the same lysines (K6, K11, K27, K33, K48) as Ub, where K27 has an role (other than conjugation) in the mechanism of protein neddylation.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 4826964    5 ITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGrdaFPVAGQKLIYAGKILSDDVPIRDYRIDE 68
Cdd:cd01806   1 IKVKTLTGKEIEIDIEPTDKVERIKERVEEKEG---IPPQQQRLIFSGKQMNDEKTAADYKIEG 61

UBA/TS-N domain; This small domain is composed of three alpha helices. This family includes the previously defined UBA and TS-N domains. The UBA-domain (ubiquitin associated domain) is a novel sequence motif found in several proteins having connections to ubiquitin and the ubiquitination pathway. The structure of the UBA domain consists of a compact three helix bundle. This domain is found at the N terminus of EF-TS hence the name TS-N. The structure of EF-TS is known and this domain is implicated in its interaction with EF-TU. The domain has been found in non EF-TS proteins such as alpha-NAC and MJ0280.

                          10        20        30
                  ....*....|....*....|....*....|....
gi 4826964    322 EAIERLKALGFPESLVIQAYFACEKNENLAANFL 355
Cdd:pfam00627   4 EAIQRLVEMGFDREQVREALRATGNNVERAAEYL 37

ubiquitin-like (Ubl) domain found in ubiquitin-like proteins UBL4A and similar proteins; UBL4A, also termed GdX, is a ubiquitously expressed ubiquitin-like (Ubl) protein that forms a complex with partner proteins and participates in the protein processing through endoplasmic reticulum (ER), acting as a chaperone. As a key component of the BCL2-associated athanogene 6 (BAG6) chaperone complex, UBL4A plays a role in mediating DNA damage signaling and cell death. UBL4A also regulates insulin-induced Akt plasma membrane translocation through promotion of Arp2/3-dependent actin branching. Moreover, UBL4A specifically stabilizes the TC45/STAT3 association and promotes dephosphorylation of STAT3 to repress tumorigenesis. UBL4B is testis-specific, and encoded by an X-derived retrogene Ubl4b, which is specifically expressed in post-meiotic germ cells in mammals. As a germ cell-specific cytoplasmic protein, UBL4B is not present in somatic cells. Moreover, UBL4B is present in elongated spermatids, but not in spermatocytes and round spermatids, suggesting its function is restricted to late spermiogenesis. The function of UBL4A may be compensated by either UBL4B or other Ubl proteins in normal conditions. Both UBL4A and UBL4B contain a conserved Ubl domain with a beta-grasp Ubl fold, a common structure involved in protein-protein interactions.

                        10        20        30        40        50        60        70
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 4826964    5 ITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGrdaFPVAGQKLIYAGKILSDDVPIRDYRI--DEKNFVVV 74
Cdd:cd01807   3 ITVKILQGKECTIEVSPTESVLTVKQLVAEQLN---VPVSQQRLVFKGKTLADEHSLSDYSIgpGSKIHLVV 71

ubiquitin; Provisional

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 4826964     5 ITLKTLQQQTFKIRMEPDETVKVLKEKIEAEKGRDAFPVagqKLIYAGKILSDDVPIRDYRI 66
Cdd:PTZ00044   3 ILIKTLTGKKQSFNFEPDNTVQQVKMALQEKEGIDVKQI---RLIYSGKQMSDDLKLSDYKV 61

UBA2 domain found in Kip1 ubiquitination-promoting complex protein 2 (KPC2) and similar proteins; KPC2, also called ubiquitin-associated domain-containing protein 1 (UBAC1), or glialblastoma cell differentiation-related protein 1, is one of two subunits of Kip1 ubiquitination-promoting complex (KPC), a novel E3 ubiquitin-protein ligase that also contains KPC1 subunit and regulates the ubiquitin-dependent degradation of the cyclin-dependent kinase (CDK) inhibitor p27 at G1 phase. KPC2 contains a ubiquitin-like (UBL) domain and two ubiquitin-associated (UBA) domains. This model corresponds to the UBA2 domain.

                        10        20        30
                ....*....|....*....|....*....|....*.
gi 4826964  164 ETMLTEIMSMGYERERVVAALRASYNNPHRAVEYLL 199
Cdd:cd14304   3 PRAVQSLMEMGFEEEDVLEALRVTRNNQNAACEWLL 38

ubiquitin-like (Ubl) domain found in homocysteine-inducible endoplasmic reticulum stress protein HERP; HERP is an endoplasmic reticulum (ER) integral membrane protein containing an N-terminal ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold. The Ubl domain is required for the degradation of HERP itself as well as for HERP-mediated anti-apoptotic effects. HERP is induced by the ER stress response pathway and is involved in improving the balance of folding capacity and protein loads in the ER. There are two types of HERP, HERP1 and HERP2, which are encoded by the HERPUD1 and HERPUD2 genes, respectively.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 4826964    3 VTITLKTLQQ--QTFKIRMEPDETVKVLKEKIEaekgrDAFP----VAGQKLIYAGKILSDDVPIRD 63
Cdd:cd01790   1 VTLVVKSPNQriQDLTVNCTLGWTVLKLKEHLS-----EVYPskplPEDQKLIYSGKLLEDHQTLKD 62

UBA domain found in proteins involved in ubiquitin-mediated proteolysis; The ubiquitin-associated (UBA) domains are commonly occurring sequence motifs found in proteins involved in ubiquitin-mediated proteolysis. They contribute to ubiquitin (Ub) binding or ubiquitin-like (UbL) domain binding. However, some kinds of UBA domains can only the bind UbL domain, but not the Ub domain. UBA domains are normally comprised of compact three-helix bundles which contain a conserved GF/Y-loop. They can bind polyubiquitin with high affinity. They also bind monoubiquitin and other proteins. Most UBA domain-containing proteins have one UBA domain, but some harbor two or three UBA domains.

                        10        20        30
                ....*....|....*....|....*....|
gi 4826964  167 LTEIMSMGYERERVVAALRASYNNPHRAVE 196
Cdd:cd14270   1 LAQLVEMGFSREQARRALRATNGDVEAAVE 30

UBA2 domain found in ubiquitin carboxyl-terminal hydrolase 5 (UBP5); UBP5, also called deubiquitinating enzyme 5, Isopeptidase T (IsoT), ubiquitin thioesterase 5, or ubiquitin-specific-processing protease 5, is a deubiquitinating enzyme largely responsible for the disassembly of the majority of unanchored polyubiquitin in the cell. Zinc is required for its catalytic activity. UBP5 contains four ubiquitin (Ub)-binding sites including an N-terminal zinc finger (ZnF) domain, a catalytic ubiquitin-specific processing protease (UBP) domain (catalytic C-box and H-box), and two ubiquitin-associated (UBA) domains. ZnF domain binds the proximal ubiquitin. UBP domain forms the active site. UBA domains are involved in binding linear or K48-linked polyubiquitin. This model corresponds to the UBA2 domain.

                        10        20        30
                ....*....|....*....|....*....|....*.
gi 4826964  167 LTEIMSMGYERERVVAALRASYNNPHRAVEYLLTGI 202
Cdd:cd14386   6 VAMLVSMGFTRDQAIKALKATDNNVERAADWIFSHP 41

ubiquitin-like (Ubl) domain found in ubiquitin domain-containing protein UBFD1 and similar proteins; UBFD1, also termed ubiquitin-binding protein homolog (UBPH), is a polyubiquitin binding protein containing a conserved ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, a common structure involved in protein-protein interactions. It may play a role as nuclear factor-kappaB (NF-kappaB) regulator.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 4826964   13 QTFKIRMEPDETVKVLKEKIEAEKGrdaFPVAGQKLIYAGkILSDDVPIRDYRIdeKNFVVVMV 76
Cdd:cd17047  10 EKYDVKFPLDSTIAELKEHIETLTG---VPPAMQKLMYKG-LLKDDKTLRELKV--TKGAKVMV 67

ubiquitin-like (Ubl) domain found in parkin and similar proteins; Parkin, also termed Parkinson juvenile disease protein 2, is a RBR-type E3 ubiquitin-protein ligase that is associated with recessive early onset Parkinson's disease (PD), and exerts a protective effect against dopamine-induced alpha-synuclein-dependent cell toxicity. Mutations in the parkin gene cause autosomal recessive juvenile parkinsonism. Parkin functions within a multiprotein E3 ubiquitin ligase complex, catalyzing the covalent attachment of ubiquitin moieties onto substrate proteins, such as BCL2, SYT11, CCNE1, GPR37, RHOT1/MIRO1, MFN1, MFN2, STUB1, SNCAIP, SEPT5, TOMM20, USP30, ZNF746 and AIMP2. It mediates monoubiquitination as well as Lys-6-, Lys-11-, Lys-48- and Lys-63-linked polyubiquitination of substrates depending on the context. Parkin may enhance cell viability and protects dopaminergic neurons from oxidative stress-mediated death by regulating mitochondrial function. It also limits the production of reactive oxygen species (ROS), and regulates cyclin-E during neuronal apoptosis. Moreover, parkin displays a ubiquitin ligase-independent function in transcriptional repression of p53. Parkin contains an N-terminal ubiquitin-like (Ubl) domain and a C-terminal RBR domain that was previously known as RING-BetweenRING-RING domain or TRIAD [two RING fingers and a DRIL (double RING finger linked)] domain. Based on current understanding of the structural biology of RBR ligases, the nomenclature of RBR has been corrected as RING-BRcat (benign-catalytic)-Rcat (required-for-catalysis) recently. The RBR (RING1-BRcat-Rcat) domain use an auto-inhibitory mechanism to modulate ubiquitination activity, as well as a hybrid mechanism that combines aspects from both RING and HECT E3 ligase function to facilitate the ubiquitination reaction.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|
gi 4826964   14 TFKIRMEPDETVKVLKEKIEAEKGrdaFPVAGQKLIYAGKILSDDVPIRD 63
Cdd:cd01798  10 GFPVEVDSDWSILQLKEVVAKRQG---VPPDQLRIIFAGKELSDDLTLQN 56

UBA domain found in Saccharomyces cerevisiae DNA-damage response protein Ddi1 and similar proteins; Ddi1, also called v-SNARE-master 1 (Vsm1), is a ubiquitin receptor involved in regulation of the cell cycle and late secretory pathway in Saccharomyces cerevisiae. It functions as a ubiquitin association domain (UBA)- ubiquitin-like-domain (UBL) shuttle protein that is required for the proteasome to enable ubiquitin-dependent degradation of its ligands. For instance, Ddi1 plays an essential role in the final stages of proteasomal degradation of Ho endonuclease and of its cognate FBP, Ufo1. Moreover, Ddi1 and its associated protein Rad23p play a cooperative role as negative regulators in yeast PHO pathway. Ddi1 contains an N-terminal UBL domain and a C-terminal UBA domain. It also harbors a central retroviral aspartyl-protease-like domain (RVP) which may be important in cell-cycle control. At this point, Ddi1 may function proteolytically during regulated protein turnover in the cell. This family also includes mammalian regulatory solute carrier protein family 1 member 1 (RSC1A1), also called transporter regulator RS1 (RS1) which mediates transcriptional and post-transcriptional regulation of Na(+)-D-glucose cotransporter SGLT1.

                        10        20        30
                ....*....|....*....|....*....|....*
gi 4826964  322 EAIERLKALGFPESLVIQAYFACEKNENLAANFLL 356
Cdd:cd14309   2 EKIAQLMDLGFSREEAIQALEATNGNVELAASLLF 36

UBA domain found in Arabidopsis thaliana E3 ubiquitin-protein ligase UPL1 (atUPL1), UPL2 (atUPL2) and similar proteins; The family includes two highly similar 405-kDa HECT E3 ubiquitin-protein ligases (UPLs), UPL1 and UPL2, from Arabidopsis thaliana. The HECT E3 UPL family plays a prominent role in the ubiquitination of plant proteins. The biological functions of UPL1 and UPL2 remain unclear. Both of them contain a ubiquitin-associated (UBA) domain and a C-terminal HECT domain. UBA domain may be involved in ubiquitin metabolism. HECT domain is necessary and sufficient for their E3 catalytic activity, but requires ATP, E1 and an E2 of the Arabidopsis UBC8 family to ubiquitinate proteins.

                        10        20        30
                ....*....|....*....|....*....|....*..
gi 4826964  166 MLTEIMSMGYERERVVAALRA-SYNNPHRAVEYLLTG 201
Cdd:cd14327   2 AVAQLVEMGFSRERAEEALRAvGTNSVELAMEWLFTN 38

UBA domain found in vacuolar protein sorting-associated protein 13D (VP13D) and similar proteins; VP13D is a chorea-acanthocytosis (CHAC)-similar protein encoded by gene VPS13D. it contains two putative domains, ubiquitin-associated (UBA) domain and lectin domain of ricin B chain profile (ricin-B-lectin), suggesting it may interact with, and be involved in the trafficking of, proteins modified with ubiquitin and/or carbohydrate molecules. Further investigation is required.

                        10        20        30
                ....*....|....*....|....*....|.
gi 4826964  171 MSMGYERERVVAALRASYNNPHRAVEYLLTG 201
Cdd:cd14306   5 MELGFPEEDCIRALRACGGNVEEAANWLLEN 35

UBA domain found in ubiquitin-associated domain-containing protein 2 (UBAC2) and similar proteins; UBAC2, also called phosphoglycerate dehydrogenase-like protein 1, is a ubiquitin-associated domain (UBA)-domain containing protein encoded by gene UBAC2 (or PHGDHL1), a risk gene for Behcet's disease (BD). It may play an important role in the development of BD through its transcriptional modulation. Members in this family contain an N-terminal rhomboid-like domain and a C-terminal UBA domain.

                        10        20        30
                ....*....|....*....|....*....|
gi 4826964  170 IMSMGYERERVVAALRASYNNPHRAVEYLL 199
Cdd:cd14305   9 LVDMGFSREDVLEALRQSNNDVNAATNLLL 38

ubiquitin-like (Ubl) domain found in NEDD8 ultimate buster 1 (NUB1) and similar proteins; NUB1, also termed negative regulator of ubiquitin-like proteins 1, or renal carcinoma antigen NY-REN-18, or protein BS4, is a NEDD8-interacting protein that can be induced by interferon. It functions as a strong post-transcriptional down-regulator of the NEDD8 expression and plays critical roles in regulating many biological events, such as cell growth, NF-kappaB signaling, and biological responses to hypoxia. NUB1 can also interact with aryl hydrocarbon receptor-interacting protein-like 1 (AIPL1), which may function in the regulation of cell cycle progression. NUB1 contains a conserved ubiquitin-like (Ubl) domain with a beta-grasp Ubl fold, three ubiquitin-associated domains (UBA), a bipartite nuclear localization signal (NLS) and a PEST motif.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*...
gi 4826964   22 DETVKVLKEKIEAEKGRDAFPVagqKLIYAGKILSDDVPIRDYRIdeKNFVVVMVTKT 79
Cdd:cd17062  26 DITGSELREKIAEELGVPEDRI---KLISNGKVLKDEKTLAEQGV--KNNSQVMVLVL 78