DNA polymerase type-B zeta subfamily catalytic domain. DNA polymerase (Pol) zeta is a member ...
2472-2920
0e+00
DNA polymerase type-B zeta subfamily catalytic domain. DNA polymerase (Pol) zeta is a member of the eukaryotic B-family of DNA polymerases and distantly related to DNA Pol delta. Pol zeta plays a major role in translesion replication and the production of either spontaneous or induced mutations. Apart from its role in translesion replication, Pol zeta also appears to be involved in somatic hypermutability in B lymphocytes, an important element for the production of high affinity antibodies in response to an antigen.
:
Pssm-ID: 99917 Cd Length: 451 Bit Score: 859.60 E-value: 0e+00
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta, a family-B DNA ...
2208-2446
6.38e-102
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta. DNA polymerase zeta is a family-B DNA polymerase which is distantly related to DNA polymerase delta. It plays a major role in translesion replication and the production of either spontaneous or induced mutations. In addition, DNA polymerase zeta also appears to be involved in somatic hypermutability in B lymphocytes, an important element for the production of high affinity antibodies in response to an antigen. The catalytic subunit contains both polymerase and 3'-5' exonuclease domains, but only exhibits polymerase activity. The DnaQ-like 3'-5' exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, without the four conserved acidic residues that are crucial for metal binding and catalysis.
:
Pssm-ID: 99821 [Multi-domain] Cd Length: 231 Bit Score: 326.88 E-value: 6.38e-102
C4-type zinc-finger of DNA polymerase delta; In fission yeast this zinc-finger domain appears ...
2956-3023
1.74e-18
C4-type zinc-finger of DNA polymerase delta; In fission yeast this zinc-finger domain appears is the region of Pol3 that binds directly to the B-subunit, Cdc1. Pol delta is a hetero-tetrameric enzyme comprising four evolutionarily well-conserved proteins: the catalytic subunit Pol3 and three smaller subunits Cdc1, Cdc27 and Cdm1.
:
Pssm-ID: 464119 Cd Length: 68 Bit Score: 81.65 E-value: 1.74e-18
REV7 binding domain found in protein reversionless 3-like (REV3L) and similar proteins; REV3L, ...
1792-1814
2.99e-08
REV7 binding domain found in protein reversionless 3-like (REV3L) and similar proteins; REV3L, also called REV3-like, or REV3, or DNA polymerase zeta catalytic subunit (POLZ), is the catalytic subunit of the DNA polymerase zeta complex, an error-prone polymerase specialized in translesion DNA synthesis (TLS). REV3L lacks an intrinsic 3'-5' exonuclease activity and thus has no proofreading function. The model corresponds to a conserved region that is responsible for the binding of REV7.
:
Pssm-ID: 412083 Cd Length: 23 Bit Score: 51.41 E-value: 2.99e-08
DNA polymerase type-B zeta subfamily catalytic domain. DNA polymerase (Pol) zeta is a member ...
2472-2920
0e+00
DNA polymerase type-B zeta subfamily catalytic domain. DNA polymerase (Pol) zeta is a member of the eukaryotic B-family of DNA polymerases and distantly related to DNA Pol delta. Pol zeta plays a major role in translesion replication and the production of either spontaneous or induced mutations. Apart from its role in translesion replication, Pol zeta also appears to be involved in somatic hypermutability in B lymphocytes, an important element for the production of high affinity antibodies in response to an antigen.
Pssm-ID: 99917 Cd Length: 451 Bit Score: 859.60 E-value: 0e+00
DNA polymerase family B; This region of DNA polymerase B appears to consist of more than one ...
2468-2915
2.25e-114
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: 371.56 E-value: 2.25e-114
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta, a family-B DNA ...
2208-2446
6.38e-102
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta. DNA polymerase zeta is a family-B DNA polymerase which is distantly related to DNA polymerase delta. It plays a major role in translesion replication and the production of either spontaneous or induced mutations. In addition, DNA polymerase zeta also appears to be involved in somatic hypermutability in B lymphocytes, an important element for the production of high affinity antibodies in response to an antigen. The catalytic subunit contains both polymerase and 3'-5' exonuclease domains, but only exhibits polymerase activity. The DnaQ-like 3'-5' exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, without the four conserved acidic residues that are crucial for metal binding and catalysis.
Pssm-ID: 99821 [Multi-domain] Cd Length: 231 Bit Score: 326.88 E-value: 6.38e-102
DNA polymerase type-B family; DNA polymerase alpha, delta, epsilon and zeta chain (eukaryota), ...
2230-2705
2.86e-98
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: 326.79 E-value: 2.86e-98
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
2293-2912
1.49e-50
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: 197.97 E-value: 1.49e-50
C4-type zinc-finger of DNA polymerase delta; In fission yeast this zinc-finger domain appears ...
2956-3023
1.74e-18
C4-type zinc-finger of DNA polymerase delta; In fission yeast this zinc-finger domain appears is the region of Pol3 that binds directly to the B-subunit, Cdc1. Pol delta is a hetero-tetrameric enzyme comprising four evolutionarily well-conserved proteins: the catalytic subunit Pol3 and three smaller subunits Cdc1, Cdc27 and Cdm1.
Pssm-ID: 464119 Cd Length: 68 Bit Score: 81.65 E-value: 1.74e-18
REV7 binding domain found in protein reversionless 3-like (REV3L) and similar proteins; REV3L, ...
1792-1814
2.99e-08
REV7 binding domain found in protein reversionless 3-like (REV3L) and similar proteins; REV3L, also called REV3-like, or REV3, or DNA polymerase zeta catalytic subunit (POLZ), is the catalytic subunit of the DNA polymerase zeta complex, an error-prone polymerase specialized in translesion DNA synthesis (TLS). REV3L lacks an intrinsic 3'-5' exonuclease activity and thus has no proofreading function. The model corresponds to a conserved region that is responsible for the binding of REV7.
Pssm-ID: 412083 Cd Length: 23 Bit Score: 51.41 E-value: 2.99e-08
DNA polymerase type-B zeta subfamily catalytic domain. DNA polymerase (Pol) zeta is a member ...
2472-2920
0e+00
DNA polymerase type-B zeta subfamily catalytic domain. DNA polymerase (Pol) zeta is a member of the eukaryotic B-family of DNA polymerases and distantly related to DNA Pol delta. Pol zeta plays a major role in translesion replication and the production of either spontaneous or induced mutations. Apart from its role in translesion replication, Pol zeta also appears to be involved in somatic hypermutability in B lymphocytes, an important element for the production of high affinity antibodies in response to an antigen.
Pssm-ID: 99917 Cd Length: 451 Bit Score: 859.60 E-value: 0e+00
DNA polymerase family B; This region of DNA polymerase B appears to consist of more than one ...
2468-2915
2.25e-114
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: 371.56 E-value: 2.25e-114
DNA polymerase type-B family catalytic domain. DNA-directed DNA polymerases elongate DNA by ...
2505-2913
6.57e-105
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: 339.73 E-value: 6.57e-105
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta, a family-B DNA ...
2208-2446
6.38e-102
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase zeta. DNA polymerase zeta is a family-B DNA polymerase which is distantly related to DNA polymerase delta. It plays a major role in translesion replication and the production of either spontaneous or induced mutations. In addition, DNA polymerase zeta also appears to be involved in somatic hypermutability in B lymphocytes, an important element for the production of high affinity antibodies in response to an antigen. The catalytic subunit contains both polymerase and 3'-5' exonuclease domains, but only exhibits polymerase activity. The DnaQ-like 3'-5' exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, without the four conserved acidic residues that are crucial for metal binding and catalysis.
Pssm-ID: 99821 [Multi-domain] Cd Length: 231 Bit Score: 326.88 E-value: 6.38e-102
DNA polymerase type-B family; DNA polymerase alpha, delta, epsilon and zeta chain (eukaryota), ...
2230-2705
2.86e-98
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: 326.79 E-value: 2.86e-98
DNA polymerase type-B delta subfamily catalytic domain. Three DNA-dependent DNA polymerases ...
2512-2915
5.32e-92
DNA polymerase type-B delta 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. Presently, no direct data is available regarding the strand specificity of DNA polymerase during DNA replication in vivo. However, mutation analysis supports the hypothesis that DNA polymerase delta is the enzyme responsible for both elongation and maturation of Okazaki fragments on the lagging strand.
Pssm-ID: 99916 Cd Length: 393 Bit Score: 305.34 E-value: 5.32e-92
DNA polymerase type-B alpha subfamily catalytic domain. Three DNA-dependent DNA polymerases ...
2511-2918
1.63e-53
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: 194.33 E-value: 1.63e-53
DEDDy 3'-5' exonuclease domain of family-B DNA polymerases; The 3'-5' exonuclease domain of ...
2222-2446
2.75e-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: 186.41 E-value: 2.75e-53
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
2293-2912
1.49e-50
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: 197.97 E-value: 1.49e-50
DNA polymerase type-B B3 subfamily catalytic domain. Archaeal proteins that are involved in ...
2511-2917
5.43e-50
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: 183.29 E-value: 5.43e-50
DNA polymerase type-II subfamily catalytic domain. Bacteria contain five DNA polymerases (I, ...
2511-2916
9.27e-29
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: 120.83 E-value: 9.27e-29
DNA polymerase type-B B2 subfamily catalytic domain. Archaeal proteins that are involved in ...
2511-2868
1.65e-21
DNA polymerase type-B B2 subfamily catalytic domain. Archaeal proteins that are involved in DNA replication are similar to those from eukaryotes. Some archaeal members 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.
Pssm-ID: 99914 Cd Length: 352 Bit Score: 98.95 E-value: 1.65e-21
C4-type zinc-finger of DNA polymerase delta; In fission yeast this zinc-finger domain appears ...
2956-3023
1.74e-18
C4-type zinc-finger of DNA polymerase delta; In fission yeast this zinc-finger domain appears is the region of Pol3 that binds directly to the B-subunit, Cdc1. Pol delta is a hetero-tetrameric enzyme comprising four evolutionarily well-conserved proteins: the catalytic subunit Pol3 and three smaller subunits Cdc1, Cdc27 and Cdm1.
Pssm-ID: 464119 Cd Length: 68 Bit Score: 81.65 E-value: 1.74e-18
DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase delta, a family-B DNA polymerase; ...
2283-2403
2.30e-14
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: 74.92 E-value: 2.30e-14
DNA polymerase type-B B1 subfamily catalytic domain. Archaeal proteins that are involved in ...
2511-2883
2.09e-12
DNA polymerase type-B B1 subfamily catalytic domain. Archaeal proteins that are involved in DNA replication are similar to those from eukaryotes. Some archaeal members 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.
Pssm-ID: 99913 Cd Length: 372 Bit Score: 71.61 E-value: 2.09e-12
DNA polymerase (pol2); All proteins in this superfamily for which functions are known are DNA ...
2244-2654
8.24e-09
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: 61.61 E-value: 8.24e-09
REV7 binding domain found in protein reversionless 3-like (REV3L) and similar proteins; REV3L, ...
1792-1814
2.99e-08
REV7 binding domain found in protein reversionless 3-like (REV3L) and similar proteins; REV3L, also called REV3-like, or REV3, or DNA polymerase zeta catalytic subunit (POLZ), is the catalytic subunit of the DNA polymerase zeta complex, an error-prone polymerase specialized in translesion DNA synthesis (TLS). REV3L lacks an intrinsic 3'-5' exonuclease activity and thus has no proofreading function. The model corresponds to a conserved region that is responsible for the binding of REV7.
Pssm-ID: 412083 Cd Length: 23 Bit Score: 51.41 E-value: 2.99e-08
DEDDy 3'-5' exonuclease domain of Pyrococcus kodakaraensis Kod1 and similar archaeal family-B ...
2289-2403
1.64e-07
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: 54.28 E-value: 1.64e-07
DEDDy 3'-5' exonuclease domain of Sulfurisphaera ohwakuensis DNA polymerase B3 and similar ...
2295-2399
6.68e-07
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: 52.33 E-value: 6.68e-07
DNA polymerase type-II B subfamily catalytic domain. Bacteria contain five DNA polymerases (I, ...
2596-2910
2.25e-04
DNA polymerase type-II B 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 proved 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: 99921 Cd Length: 347 Bit Score: 46.33 E-value: 2.25e-04
Uncharacterized bacterial subgroup of the DEDDy 3'-5' exonuclease domain of family-B DNA ...
2294-2401
1.99e-03
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: 42.40 E-value: 1.99e-03
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase alpha, a family-B DNA ...
2236-2403
8.45e-03
inactive DEDDy 3'-5' exonuclease domain of eukaryotic DNA polymerase alpha, a family-B DNA polymerase; The 3'-5' exonuclease domain of eukaryotic DNA polymerase alpha. DNA polymerase alpha is a family-B DNA polymerase with a catalytic subunit that contains a DnaQ-like 3'-5' exonuclease domain. It is one of the three DNA-dependent type B DNA polymerases (delta and epsilon are the other two) that have been identified as essential for nuclear DNA replication in eukaryotes. DNA polymerase alpha is almost exclusively required for the initiation of DNA replication and the priming of Okazaki fragments during elongation. It associates with DNA primase and is the only enzyme able to start DNA synthesis de novo. The catalytic subunit contains both polymerase and 3'-5' exonuclease domains, but only exhibits polymerase activity. The 3'-5' exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, without the four conserved acidic residues that are crucial for metal binding and catalysis. This explains why in most organisms, that no specific repair role, other than check point control, has been assigned to this enzyme. The exonuclease domain may have a structural role.
Pssm-ID: 99819 [Multi-domain] Cd Length: 234 Bit Score: 40.67 E-value: 8.45e-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.
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