DNA polymerase type-B family catalytic domain. DNA-directed DNA polymerases elongate DNA by ...
476-949
0e+00
DNA polymerase type-B family catalytic domain. DNA-directed DNA polymerases elongate DNA by adding nucleotide triphosphate (dNTP) residues to the 5'-end of the growing chain of DNA. DNA-directed DNA polymerases are multifunctional with both synthetic (polymerase) and degradative modes (exonucleases) and play roles in the processes of DNA replication, repair, and recombination. DNA-dependent DNA polymerases can be classified in six main groups based upon their phylogenetic relationships with E. coli polymerase I (class A), E. coli polymerase II (class B), E. coli polymerase III (class C), euryarchaeota polymerase II (class D), human polymerase beta (class x), E. coli UmuC/DinB, and eukaryotic RAP 30/Xeroderma pigmentosum variant (class Y). Family B DNA polymerases include E. coli DNA polymerase II, some eubacterial phage DNA polymerases, nuclear replicative DNA polymerases (alpha, delta, epsilon, and zeta), and eukaryotic viral and plasmid-borne enzymes. DNA polymerase is made up of distinct domains and sub-domains. The polymerase domain of DNA polymerase type B (Pol domain) is responsible for the template-directed polymerization of dNTPs onto the growing primer strand of duplex DNA that is usually magnesium dependent. In general, the architecture of the Pol domain has been likened to a right hand with fingers, thumb, and palm sub-domains with a deep groove to accommodate the nucleic acid substrate. There are a few conserved motifs in the Pol domain of family B DNA polymerases. The conserved aspartic acid residues in the DTDS motifs of the palm sub-domain is crucial for binding to divalent metal ion and is suggested to be important for polymerase catalysis.
The actual alignment was detected with superfamily member cd05535:
Pssm-ID: 353046 Cd Length: 621 Bit Score: 943.26 E-value: 0e+00
Domain of unknown function (DUF1744); This domain is found at the C-terminal of the epsilon ...
1321-1732
0e+00
Domain of unknown function (DUF1744); This domain is found at the C-terminal of the epsilon catalytic subunit of DNA polymerase. It is found C terminal to pfam03104 and pfam00136.
:
Pssm-ID: 462493 Cd Length: 400 Bit Score: 573.72 E-value: 0e+00
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon, a family-B DNA polymerase; ...
218-416
1.84e-148
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon. DNA polymerase epsilon is a family-B DNA polymerase with a catalytic subunit that contains a DEDDy-type DnaQ-like 3'-5' exonuclease domain. It is one of the three DNA-dependent type B DNA polymerases (alpha and delta are the other two) that have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase epsilon plays a role in elongating the leading strand during DNA replication. It is also involved in DNA repair. The catalytic subunit contains both polymerase and 3'-5' exonuclease activities. The N-terminal exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and are involved in metal binding and catalysis. DNA polymerase epsilon also carries a unique large C-terminal domain with an unknown function. Phylogenetic analyses indicate that it is orthologous to the archaeal DNA polymerase B3 rather than to the eukaryotic alpha, delta, or zeta polymerases. The exonuclease domain of family-B polymerases contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation
:
Pssm-ID: 99822 [Multi-domain] Cd Length: 204 Bit Score: 457.11 E-value: 1.84e-148
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
11-325
2.93e-06
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA polymerases.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]
The actual alignment was detected with superfamily member TIGR00592:
Pssm-ID: 273159 [Multi-domain] Cd Length: 1172 Bit Score: 52.75 E-value: 2.93e-06
DNA polymerase type-B epsilon subfamily catalytic domain. Three DNA-dependent DNA polymerases ...
476-949
0e+00
DNA polymerase type-B epsilon subfamily catalytic domain. Three DNA-dependent DNA polymerases type B (alpha, delta, and epsilon) have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase (Pol) epsilon has been proposed to play a role in elongation of the leading strand during DNA replication. Pol epsilon might also have a role in DNA repair. The structure of pol epsilon is characteristic of this family with the exception that it contains a large c-terminal domain with an unclear function. Phylogenetic analyses indicate that Pol epsilon is the ortholog to the archaeal Pol B3 rather than to Pol alpha, delta, or zeta. This might be because pol epsilon is ancestral to both archaea and eukaryotes DNA polymerases type B.
Pssm-ID: 99918 Cd Length: 621 Bit Score: 943.26 E-value: 0e+00
Domain of unknown function (DUF1744); This domain is found at the C-terminal of the epsilon ...
1321-1732
0e+00
Domain of unknown function (DUF1744); This domain is found at the C-terminal of the epsilon catalytic subunit of DNA polymerase. It is found C terminal to pfam03104 and pfam00136.
Pssm-ID: 462493 Cd Length: 400 Bit Score: 573.72 E-value: 0e+00
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon, a family-B DNA polymerase; ...
218-416
1.84e-148
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon. DNA polymerase epsilon is a family-B DNA polymerase with a catalytic subunit that contains a DEDDy-type DnaQ-like 3'-5' exonuclease domain. It is one of the three DNA-dependent type B DNA polymerases (alpha and delta are the other two) that have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase epsilon plays a role in elongating the leading strand during DNA replication. It is also involved in DNA repair. The catalytic subunit contains both polymerase and 3'-5' exonuclease activities. The N-terminal exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and are involved in metal binding and catalysis. DNA polymerase epsilon also carries a unique large C-terminal domain with an unknown function. Phylogenetic analyses indicate that it is orthologous to the archaeal DNA polymerase B3 rather than to the eukaryotic alpha, delta, or zeta polymerases. The exonuclease domain of family-B polymerases contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation
Pssm-ID: 99822 [Multi-domain] Cd Length: 204 Bit Score: 457.11 E-value: 1.84e-148
DNA polymerase type-B family; DNA polymerase alpha, delta, epsilon and zeta chain (eukaryota), ...
217-674
1.08e-64
DNA polymerase type-B family; DNA polymerase alpha, delta, epsilon and zeta chain (eukaryota), DNA polymerases in archaea, DNA polymerase II in e. coli, mitochondrial DNA polymerases and and virus DNA polymerases
Pssm-ID: 214691 [Multi-domain] Cd Length: 474 Bit Score: 228.57 E-value: 1.08e-64
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
614-931
5.63e-13
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA polymerases.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 273159 [Multi-domain] Cd Length: 1172 Bit Score: 74.71 E-value: 5.63e-13
DNA polymerase family B; This region of DNA polymerase B appears to consist of more than one ...
580-842
5.08e-07
DNA polymerase family B; This region of DNA polymerase B appears to consist of more than one structural domain, possibly including elongation, DNA-binding and dNTP binding activities.
Pssm-ID: 395085 Cd Length: 439 Bit Score: 54.54 E-value: 5.08e-07
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
11-325
2.93e-06
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA polymerases.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 273159 [Multi-domain] Cd Length: 1172 Bit Score: 52.75 E-value: 2.93e-06
DNA polymerase type-B epsilon subfamily catalytic domain. Three DNA-dependent DNA polymerases ...
476-949
0e+00
DNA polymerase type-B epsilon subfamily catalytic domain. Three DNA-dependent DNA polymerases type B (alpha, delta, and epsilon) have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase (Pol) epsilon has been proposed to play a role in elongation of the leading strand during DNA replication. Pol epsilon might also have a role in DNA repair. The structure of pol epsilon is characteristic of this family with the exception that it contains a large c-terminal domain with an unclear function. Phylogenetic analyses indicate that Pol epsilon is the ortholog to the archaeal Pol B3 rather than to Pol alpha, delta, or zeta. This might be because pol epsilon is ancestral to both archaea and eukaryotes DNA polymerases type B.
Pssm-ID: 99918 Cd Length: 621 Bit Score: 943.26 E-value: 0e+00
Domain of unknown function (DUF1744); This domain is found at the C-terminal of the epsilon ...
1321-1732
0e+00
Domain of unknown function (DUF1744); This domain is found at the C-terminal of the epsilon catalytic subunit of DNA polymerase. It is found C terminal to pfam03104 and pfam00136.
Pssm-ID: 462493 Cd Length: 400 Bit Score: 573.72 E-value: 0e+00
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon, a family-B DNA polymerase; ...
218-416
1.84e-148
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase epsilon. DNA polymerase epsilon is a family-B DNA polymerase with a catalytic subunit that contains a DEDDy-type DnaQ-like 3'-5' exonuclease domain. It is one of the three DNA-dependent type B DNA polymerases (alpha and delta are the other two) that have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase epsilon plays a role in elongating the leading strand during DNA replication. It is also involved in DNA repair. The catalytic subunit contains both polymerase and 3'-5' exonuclease activities. The N-terminal exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and are involved in metal binding and catalysis. DNA polymerase epsilon also carries a unique large C-terminal domain with an unknown function. Phylogenetic analyses indicate that it is orthologous to the archaeal DNA polymerase B3 rather than to the eukaryotic alpha, delta, or zeta polymerases. The exonuclease domain of family-B polymerases contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation
Pssm-ID: 99822 [Multi-domain] Cd Length: 204 Bit Score: 457.11 E-value: 1.84e-148
DNA polymerase type-B family; DNA polymerase alpha, delta, epsilon and zeta chain (eukaryota), ...
217-674
1.08e-64
DNA polymerase type-B family; DNA polymerase alpha, delta, epsilon and zeta chain (eukaryota), DNA polymerases in archaea, DNA polymerase II in e. coli, mitochondrial DNA polymerases and and virus DNA polymerases
Pssm-ID: 214691 [Multi-domain] Cd Length: 474 Bit Score: 228.57 E-value: 1.08e-64
DEDDy 3'-5' exonuclease domain of family-B DNA polymerases; The 3'-5' exonuclease domain of ...
221-416
2.11e-53
DEDDy 3'-5' exonuclease domain of family-B DNA polymerases; The 3'-5' exonuclease domain of family-B DNA polymerases. This domain has a fundamental role in reducing polymerase errors and is involved in proofreading activity. Family-B DNA polymerases contain an N-terminal DEDDy DnaQ-like exonuclease domain in the same polypeptide chain as the polymerase domain, similar to family-A DNA polymerases. This domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and contain four conserved acidic residues that serve as ligands for the two metal ions required for catalysis. The exonuclease domain of family B polymerase also contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation. Members include Escherichia coli DNA polymerase II, some eubacterial phage DNA polymerases, nuclear replicative DNA polymerases (alpha, delta, epsilon and zeta), and eukaryotic viral and plasmid-borne enzymes. Nuclear DNA polymerases alpha and zeta lack the four conserved acidic metal-binding residues. Family-B DNA polymerases are predominantly involved in DNA replication and DNA repair.
Pssm-ID: 176646 [Multi-domain] Cd Length: 199 Bit Score: 186.02 E-value: 2.11e-53
DNA polymerase type-B family catalytic domain. DNA-directed DNA polymerases elongate DNA by ...
565-943
3.76e-41
DNA polymerase type-B family catalytic domain. DNA-directed DNA polymerases elongate DNA by adding nucleotide triphosphate (dNTP) residues to the 5'-end of the growing chain of DNA. DNA-directed DNA polymerases are multifunctional with both synthetic (polymerase) and degradative modes (exonucleases) and play roles in the processes of DNA replication, repair, and recombination. DNA-dependent DNA polymerases can be classified in six main groups based upon their phylogenetic relationships with E. coli polymerase I (class A), E. coli polymerase II (class B), E. coli polymerase III (class C), euryarchaeota polymerase II (class D), human polymerase beta (class x), E. coli UmuC/DinB, and eukaryotic RAP 30/Xeroderma pigmentosum variant (class Y). Family B DNA polymerases include E. coli DNA polymerase II, some eubacterial phage DNA polymerases, nuclear replicative DNA polymerases (alpha, delta, epsilon, and zeta), and eukaryotic viral and plasmid-borne enzymes. DNA polymerase is made up of distinct domains and sub-domains. The polymerase domain of DNA polymerase type B (Pol domain) is responsible for the template-directed polymerization of dNTPs onto the growing primer strand of duplex DNA that is usually magnesium dependent. In general, the architecture of the Pol domain has been likened to a right hand with fingers, thumb, and palm sub-domains with a deep groove to accommodate the nucleic acid substrate. There are a few conserved motifs in the Pol domain of family B DNA polymerases. The conserved aspartic acid residues in the DTDS motifs of the palm sub-domain is crucial for binding to divalent metal ion and is suggested to be important for polymerase catalysis.
Pssm-ID: 99912 [Multi-domain] Cd Length: 323 Bit Score: 155.22 E-value: 3.76e-41
DNA polymerase type-B B3 subfamily catalytic domain. Archaeal proteins that are involved in ...
567-947
7.57e-20
DNA polymerase type-B B3 subfamily catalytic domain. Archaeal proteins that are involved in DNA replication are similar to those from eukaryotes. Some members of the archaea also possess multiple family B DNA polymerases (B1, B2 and B3). So far there is no specific function(s) has been assigned for different members of the archaea type B DNA polymerases. Phylogenetic analyses of eubacterial, archaeal, and eukaryotic family B DNA polymerases are support independent gene duplications during the evolution of archaeal and eukaryotic family B DNA polymerases. Structural comparison of the thermostable DNA polymerase type B to its mesostable homolog suggests several adaptations to high temperature such as shorter loops, disulfide bridges, and increasing electrostatic interaction at subdomain interfaces.
Pssm-ID: 99919 Cd Length: 371 Bit Score: 93.93 E-value: 7.57e-20
DEDDy 3'-5' exonuclease domain of Pyrococcus kodakaraensis Kod1 and similar archaeal family-B ...
217-414
5.04e-16
DEDDy 3'-5' exonuclease domain of Pyrococcus kodakaraensis Kod1 and similar archaeal family-B DNA polymerases; The 3'-5' exonuclease domain of archaeal family-B DNA polymerases with similarity to Pyrococcus kodakaraensis Kod1, including polymerases from Desulfurococcus (D. Tok Pol) and Thermococcus gorgonarius (Tgo Pol). Kod1, D. Tok Pol, and Tgo Pol are thermostable enzymes that exhibit both polymerase and 3'-5' exonuclease activities. They are family-B DNA polymerases. Their amino termini harbor a DEDDy-type DnaQ-like 3'-5' exonuclease domain that contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and are involved in metal binding and catalysis. The exonuclease domain of family B polymerases contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation. Members of this subfamily show similarity to eukaryotic DNA polymerases involved in DNA replication. Some archaea possess multiple family-B DNA polymerases. Phylogenetic analyses of eubacterial, archaeal, and eukaryotic family-B DNA polymerases support independent gene duplications during the evolution of archaeal and eukaryotic family-B DNA polymerases.
Pssm-ID: 99823 [Multi-domain] Cd Length: 195 Bit Score: 78.55 E-value: 5.04e-16
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
614-931
5.63e-13
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA polymerases.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 273159 [Multi-domain] Cd Length: 1172 Bit Score: 74.71 E-value: 5.63e-13
Uncharacterized bacterial subgroup of the DEDDy 3'-5' exonuclease domain of family-B DNA ...
221-356
8.86e-09
Uncharacterized bacterial subgroup of the DEDDy 3'-5' exonuclease domain of family-B DNA polymerases; A subfamily of the 3'-5' exonuclease domain of family-B DNA polymerases. This subfamily is composed of uncharacterized bacterial family-B DNA polymerases. Family-B DNA polymerases contain an N-terminal DEDDy DnaQ-like exonuclease domain in the same polypeptide chain as the polymerase domain, similar to family-A DNA polymerases. This exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are involved in metal binding and catalysis. The exonuclease domain of family-B DNA polymerases has a fundamental role in proofreading activity. It contains a beta hairpin structure that plays an important role in active site switching in the event of a nucleotide misincorporation. Family-B DNA polymerases are predominantly involved in DNA replication and DNA repair.
Pssm-ID: 99825 [Multi-domain] Cd Length: 208 Bit Score: 57.64 E-value: 8.86e-09
DNA polymerase type-B alpha subfamily catalytic domain. Three DNA-dependent DNA polymerases ...
614-892
5.22e-08
DNA polymerase type-B alpha subfamily catalytic domain. Three DNA-dependent DNA polymerases type B (alpha, delta, and epsilon) have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase (Pol) alpha is almost exclusively required for the initiation of DNA replication and the priming of Okazaki fragments during elongation. In most organisms no specific repair role, other than check point control, has been assigned to this enzyme. Pol alpha contains both polymerase and exonuclease domains, but lacks exonuclease activity suggesting that the exonuclease domain may be for structural purposes only.
Pssm-ID: 99915 Cd Length: 400 Bit Score: 57.59 E-value: 5.22e-08
DNA polymerase family B; This region of DNA polymerase B appears to consist of more than one ...
580-842
5.08e-07
DNA polymerase family B; This region of DNA polymerase B appears to consist of more than one structural domain, possibly including elongation, DNA-binding and dNTP binding activities.
Pssm-ID: 395085 Cd Length: 439 Bit Score: 54.54 E-value: 5.08e-07
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase delta, a family-B DNA polymerase; ...
221-344
1.54e-06
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase delta, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase delta. DNA polymerase delta is a family-B DNA polymerase with a catalytic subunit that contains a DEDDy-type DnaQ-like 3'-5' exonuclease domain. It is one of the three DNA-dependent type B DNA polymerases (alpha and epsilon are the other two) that have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase delta is the enzyme responsible for both elongation and maturation of Okazaki fragments on the lagging strand. It is also implicated in mismatch repair (MMR) and base excision repair (BER). The catalytic subunit displays both polymerase and 3'-5' exonuclease activities. The exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and contain four conserved acidic residues necessary for metal binding and catalysis. The exonuclease domain of family B polymerase also contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation.
Pssm-ID: 99820 [Multi-domain] Cd Length: 230 Bit Score: 51.42 E-value: 1.54e-06
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
11-325
2.93e-06
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA polymerases.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 273159 [Multi-domain] Cd Length: 1172 Bit Score: 52.75 E-value: 2.93e-06
DEDDy 3'-5' exonuclease domain of Sulfurisphaera ohwakuensis DNA polymerase B3 and similar ...
217-331
5.23e-06
DEDDy 3'-5' exonuclease domain of Sulfurisphaera ohwakuensis DNA polymerase B3 and similar archaeal family-B DNA polymerases; The 3'-5' exonuclease domain of archaeal proteins with similarity to Sulfurisphaera ohwakuensis DNA polymerase B3. B3 is a family-B DNA polymerase. Family-B DNA polymerases contain an N-terminal DEDDy DnaQ-like exonuclease domain in the same polypeptide chain as the polymerase domain, similar to family-A DNA polymerases. B3 exhibits both polymerase and 3'-5' exonuclease activities. This exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and are involved in metal binding and catalysis. The exonuclease domain of family B polymerases also contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation. Archaeal proteins that are involved in DNA replication are similar to those from eukaryotes. Some archaea possess multiple family-B DNA polymerases. B3 is mainly found in crenarchaea. Phylogenetic analyses of eubacterial, archaeal, and eukaryotic family B-DNA polymerases support independent gene duplications during the evolution of archaeal and eukaryotic family-B DNA polymerases.
Pssm-ID: 99824 [Multi-domain] Cd Length: 188 Bit Score: 49.25 E-value: 5.23e-06
DNA polymerase type-II subfamily catalytic domain. Bacteria contain five DNA polymerases (I, ...
577-892
5.36e-06
DNA polymerase type-II subfamily catalytic domain. Bacteria contain five DNA polymerases (I, II, III, IV and V). DNA polymerase II (Pol II) is a prototype for the B-family of polymerases. The role of Pol II in a variety of cellular activities, such as repair of DNA damaged by UV irradiation or oxidation has been proven by genetic studies. DNA polymerase III is the main enzyme responsible for replication of the bacterial chromosome; however, In vivo studies have also shown that Pol II is able to participate in chromosomal DNA replication with larger role in lagging-strand replication.
Pssm-ID: 99920 Cd Length: 371 Bit Score: 51.11 E-value: 5.36e-06
Uncharacterized bacterial subgroup of the DEDDy 3'-5' exonuclease domain of family-B DNA ...
222-379
8.21e-06
Uncharacterized bacterial subgroup of the DEDDy 3'-5' exonuclease domain of family-B DNA polymerases; A subfamily of the 3'-5' exonuclease domain of family-B DNA polymerases. This subfamily is composed of uncharacterized bacterial family-B DNA polymerases. Family-B DNA polymerases contain an N-terminal DEDDy DnaQ-like exonuclease domain in the same polypeptide chain as the polymerase domain, similar to family-A DNA polymerases. This exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are involved in metal binding and catalysis. The exonuclease domain of family-B DNA polymerases has a fundamental role in proofreading activity. It contains a beta hairpin structure that plays an important role in active site switching in the event of a nucleotide misincorporation. Family-B DNA polymerases are predominantly involved in DNA replication and DNA repair.
Pssm-ID: 99828 [Multi-domain] Cd Length: 207 Bit Score: 48.95 E-value: 8.21e-06
DEDDy 3'-5' exonuclease domain of Sulfolobus solfataricus DNA polymerase B1 and similar ...
217-416
8.26e-06
DEDDy 3'-5' exonuclease domain of Sulfolobus solfataricus DNA polymerase B1 and similar archaeal family-B DNA polymerases; The 3'-5' exonuclease domain of Sulfolobus solfataricus DNA polymerase B1 and similar archaeal proteins. B1 is a family-B DNA polymerase. Family-B DNA polymerases contain an N-terminal DEDDy DnaQ-like exonuclease domain in the same polypeptide chain as the polymerase domain, similar to family-A DNA polymerases. B1displays thermostable polymerase and 3'-5' exonuclease activities. This exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and are involved in metal binding and catalysis. The exonuclease domain of family-B polymerases also contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation. Family-B DNA polymerases from thermophilic archaea are unique in that they are able to recognize the presence of uracil in the template strand, leading to the stalling of DNA synthesis. This is an additional safeguard mechanism against increased levels of deaminated bases during genome duplication at high temperatures. S. solfataricus B1 also interacts with DNA polymerase Y and may contribute to genome stability mechanisms.
Pssm-ID: 99826 [Multi-domain] Cd Length: 204 Bit Score: 48.85 E-value: 8.26e-06
Predicted 3'-5' exonuclease related to the exonuclease domain of PolB; This domain is found in ...
285-332
2.73e-03
Predicted 3'-5' exonuclease related to the exonuclease domain of PolB; This domain is found in various prokaryotic 3'-5' exonucleases and hypothetical proteins.
Pssm-ID: 462958 [Multi-domain] Cd Length: 210 Bit Score: 41.44 E-value: 2.73e-03
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
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