P-loop containing Nucleoside Triphosphate Hydrolases; Members of the P-loop NTPase domain superfamily are characterized by a conserved nucleotide phosphate-binding motif, also referred to as the Walker A motif (GxxxxGK[S/T], where x is any residue), and the Walker B motif (hhhh[D/E], where h is a hydrophobic residue). The Walker A and B motifs bind the beta-gamma phosphate moiety of the bound nucleotide (typically ATP or GTP) and the Mg2+ cation, respectively. The P-loop NTPases are involved in diverse cellular functions, and they can be divided into two major structural classes: the KG (kinase-GTPase) class which includes Ras-like GTPases and its circularly permutated YlqF-like; and the ASCE (additional strand catalytic E) class which includes ATPase Binding Cassette (ABC), DExD/H-like helicases, 4Fe-4S iron sulfur cluster binding proteins of NifH family, RecA-like F1-ATPases, and ATPases Associated with a wide variety of Activities (AAA). Also included are a diverse set of nucleotide/nucleoside kinase families.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767914422   1 MRVVLNKADQIETQQLMRVYGALMWSLGKIVNTPEVIRVYIGSFWSHPLLIPDNRKLFEAEEQDLFRDIQSLPRNAALRK 80
Cdd:cd09913  155 IRIVLNKADMVDTQQLMRVYGALMWSLSKVINTPEVPRVYIGSFWDQPYEPDTNRKLFLEEEIDLLRDLNSLPRNAALRK 234

                 ....*..
gi 767914422  81 LNDLIKR 87
Cdd:cd09913  235 LNDLIKR 241

Eps15 homology domain (EHD), C-terminal domain; Dynamin-like C-terminal Eps15 homology domain (EHD) proteins regulate endocytic events; they have been linked to a number of Rab proteins through their association with mutual effectors, suggesting a coordinate role in endocytic regulation. Eukaryotic EHDs comprise four members (EHD1-4) in mammals and single members in Caenorhabditis elegans (Rme-1), Drosophila melanogaster (Past1) as well as several eukaryotic parasites. EHD1 regulates trafficking of multiple receptors from the endocytic recycling compartment (ERC) to the plasma membrane; EHD2 regulates trafficking from the plasma membrane by controlling Rac1 activity; EHD3 regulates endosome-to-Golgi transport, and preserves Golgi morphology; EHD4 is involved in the control of trafficking at the early endosome and regulates exit of cargo toward the recycling compartment as well as late endocytic pathway. Rme-1, an ortholog of human EHD1, controls the recycling of internalized receptors from the endocytic recycling compartment to the plasma membrane. In D. melanogaster, deletion of the Past1 gene leads to infertility as well as premature death of adult flies. Arabidopsis thaliana also has homologs of EHD proteins (AtEHD1 and AtEHD2), possibly involved in regulating endocytosis and signaling.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767914422   1 MRVVLNKADQIETQQLMRVYGALMWSLGKIVNTPEVIRVYIGSFWSHPLLIPDNRKLFEAEEQDLFRDIQSLPRNAALRK 80
Cdd:cd09913  155 IRIVLNKADMVDTQQLMRVYGALMWSLSKVINTPEVPRVYIGSFWDQPYEPDTNRKLFLEEEIDLLRDLNSLPRNAALRK 234

                 ....*..
gi 767914422  81 LNDLIKR 87
Cdd:cd09913  235 LNDLIKR 241

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 767914422 235 YDEIFYTLSPV-DGKITGANAKKEMVRSKLPNSVLGKIWKLADIDKDGMLDDDEFALANHLIKVKLE 300
Cdd:cd00052    1 YDQIFRSLDPDgDGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67

Eps15 homology domain (EHD), C-terminal domain; Dynamin-like C-terminal Eps15 homology domain (EHD) proteins regulate endocytic events; they have been linked to a number of Rab proteins through their association with mutual effectors, suggesting a coordinate role in endocytic regulation. Eukaryotic EHDs comprise four members (EHD1-4) in mammals and single members in Caenorhabditis elegans (Rme-1), Drosophila melanogaster (Past1) as well as several eukaryotic parasites. EHD1 regulates trafficking of multiple receptors from the endocytic recycling compartment (ERC) to the plasma membrane; EHD2 regulates trafficking from the plasma membrane by controlling Rac1 activity; EHD3 regulates endosome-to-Golgi transport, and preserves Golgi morphology; EHD4 is involved in the control of trafficking at the early endosome and regulates exit of cargo toward the recycling compartment as well as late endocytic pathway. Rme-1, an ortholog of human EHD1, controls the recycling of internalized receptors from the endocytic recycling compartment to the plasma membrane. In D. melanogaster, deletion of the Past1 gene leads to infertility as well as premature death of adult flies. Arabidopsis thaliana also has homologs of EHD proteins (AtEHD1 and AtEHD2), possibly involved in regulating endocytosis and signaling.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767914422   1 MRVVLNKADQIETQQLMRVYGALMWSLGKIVNTPEVIRVYIGSFWSHPLLIPDNRKLFEAEEQDLFRDIQSLPRNAALRK 80
Cdd:cd09913  155 IRIVLNKADMVDTQQLMRVYGALMWSLSKVINTPEVPRVYIGSFWDQPYEPDTNRKLFLEEEIDLLRDLNSLPRNAALRK 234

                 ....*..
gi 767914422  81 LNDLIKR 87
Cdd:cd09913  235 LNDLIKR 241

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 767914422 235 YDEIFYTLSPV-DGKITGANAKKEMVRSKLPNSVLGKIWKLADIDKDGMLDDDEFALANHLIKVKLE 300
Cdd:cd00052    1 YDQIFRSLDPDgDGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67