3'-5' exonuclease family protein may cleave nucleotides one at a time from the end (exo) of a polynucleotide chain| 3'-5' exonuclease has a fundamental role in reducing polymerase errors and is involved in proofreading activity
DEDDh 3'-5' exonuclease domain of three prime repair exonuclease (TREX)1, TREX2, and similar ...
10-204
8.13e-89
DEDDh 3'-5' exonuclease domain of three prime repair exonuclease (TREX)1, TREX2, and similar proteins; Three prime repair exonuclease (TREX)1 and TREX2 are closely related DEDDh-type DnaQ-like 3'-5' exonucleases. They contain three conserved sequence motifs known as ExoI, II, and III, with a specific Hx(4)D conserved pattern at ExoIII. These motifs contain four conserved acidic residues that participate in coordination of divalent metal ions required for catalysis. Both proteins play a role in the metabolism and clearance of DNA. TREX1 is the major 3'-5' exonuclease activity detected in mammalian cells. Mutations in the human TREX1 gene can cause Aicardi-Goutieres syndrome (AGS), which is characterized by perturbed innate immunity and presents itself as a severe neurological disease. TREX1 degrades ssDNA generated by aberrant replication intermediates to prevent checkpoint activation and autoimmune disease. There are distinct structural differences between TREX1 and TREX2 that point to different biological roles for these proteins. The main difference is the presence of about 70 amino acids at the C-terminus of TREX1. In addition, TREX1 has a nonrepetitive proline-rich region that is not present in the TREX2 protein. Furthermore, TREX2 contains a conserved DNA binding loop positioned adjacent to the active site that has a sequence distinct from the corresponding loop in TREX1. Truncations in the C-terminus of human TREX1 cause autosomal dominant retinal vasculopathy with cerebral leukodystrophy (RVCL), a neurovascular syndrome featuring a progressive loss of visual acuity combined with a variable neurological picture.
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Pssm-ID: 99839 [Multi-domain] Cd Length: 177 Bit Score: 259.96 E-value: 8.13e-89
DEDDh 3'-5' exonuclease domain of three prime repair exonuclease (TREX)1, TREX2, and similar ...
10-204
8.13e-89
DEDDh 3'-5' exonuclease domain of three prime repair exonuclease (TREX)1, TREX2, and similar proteins; Three prime repair exonuclease (TREX)1 and TREX2 are closely related DEDDh-type DnaQ-like 3'-5' exonucleases. They contain three conserved sequence motifs known as ExoI, II, and III, with a specific Hx(4)D conserved pattern at ExoIII. These motifs contain four conserved acidic residues that participate in coordination of divalent metal ions required for catalysis. Both proteins play a role in the metabolism and clearance of DNA. TREX1 is the major 3'-5' exonuclease activity detected in mammalian cells. Mutations in the human TREX1 gene can cause Aicardi-Goutieres syndrome (AGS), which is characterized by perturbed innate immunity and presents itself as a severe neurological disease. TREX1 degrades ssDNA generated by aberrant replication intermediates to prevent checkpoint activation and autoimmune disease. There are distinct structural differences between TREX1 and TREX2 that point to different biological roles for these proteins. The main difference is the presence of about 70 amino acids at the C-terminus of TREX1. In addition, TREX1 has a nonrepetitive proline-rich region that is not present in the TREX2 protein. Furthermore, TREX2 contains a conserved DNA binding loop positioned adjacent to the active site that has a sequence distinct from the corresponding loop in TREX1. Truncations in the C-terminus of human TREX1 cause autosomal dominant retinal vasculopathy with cerebral leukodystrophy (RVCL), a neurovascular syndrome featuring a progressive loss of visual acuity combined with a variable neurological picture.
Pssm-ID: 99839 [Multi-domain] Cd Length: 177 Bit Score: 259.96 E-value: 8.13e-89
exonuclease, DNA polymerase III, epsilon subunit family; All proteins in this family for which ...
6-202
2.36e-05
exonuclease, DNA polymerase III, epsilon subunit family; All proteins in this family for which functions are known are components of the DNA polymerase III complex (epsilon subunit). There is, however, an outgroup that includes paralogs in some gamma-proteobacteria and the n-terminal region of DinG from some low GC gram positive bacteria. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, Degradation of DNA]
Pssm-ID: 129663 [Multi-domain] Cd Length: 217 Bit Score: 43.98 E-value: 2.36e-05
DEDDh 3'-5' exonuclease domain of three prime repair exonuclease (TREX)1, TREX2, and similar ...
10-204
8.13e-89
DEDDh 3'-5' exonuclease domain of three prime repair exonuclease (TREX)1, TREX2, and similar proteins; Three prime repair exonuclease (TREX)1 and TREX2 are closely related DEDDh-type DnaQ-like 3'-5' exonucleases. They contain three conserved sequence motifs known as ExoI, II, and III, with a specific Hx(4)D conserved pattern at ExoIII. These motifs contain four conserved acidic residues that participate in coordination of divalent metal ions required for catalysis. Both proteins play a role in the metabolism and clearance of DNA. TREX1 is the major 3'-5' exonuclease activity detected in mammalian cells. Mutations in the human TREX1 gene can cause Aicardi-Goutieres syndrome (AGS), which is characterized by perturbed innate immunity and presents itself as a severe neurological disease. TREX1 degrades ssDNA generated by aberrant replication intermediates to prevent checkpoint activation and autoimmune disease. There are distinct structural differences between TREX1 and TREX2 that point to different biological roles for these proteins. The main difference is the presence of about 70 amino acids at the C-terminus of TREX1. In addition, TREX1 has a nonrepetitive proline-rich region that is not present in the TREX2 protein. Furthermore, TREX2 contains a conserved DNA binding loop positioned adjacent to the active site that has a sequence distinct from the corresponding loop in TREX1. Truncations in the C-terminus of human TREX1 cause autosomal dominant retinal vasculopathy with cerebral leukodystrophy (RVCL), a neurovascular syndrome featuring a progressive loss of visual acuity combined with a variable neurological picture.
Pssm-ID: 99839 [Multi-domain] Cd Length: 177 Bit Score: 259.96 E-value: 8.13e-89
DEDDh 3'-5' exonuclease domain family; DEDDh exonucleases, part of the DnaQ-like (or DEDD) ...
11-202
2.78e-17
DEDDh 3'-5' exonuclease domain family; DEDDh exonucleases, part of the DnaQ-like (or DEDD) exonuclease superfamily, catalyze the excision of nucleoside monophosphates at the DNA or RNA termini in the 3'-5' direction. These proteins contain four invariant acidic residues in three conserved sequence motifs termed ExoI, ExoII and ExoIII. DEDDh exonucleases are classified as such because of the presence of specific Hx(4)D conserved pattern at the ExoIII motif. The four conserved acidic residues are clustered around the active site and serve as ligands for the two metal ions required for catalysis. Most DEDDh exonucleases are the proofreading subunits (epsilon) or domains of bacterial DNA polymerase III, the main replicating enzyme in bacteria, which functions as the chromosomal replicase. Other members include other DNA and RNA exonucleases such as RNase T, Oligoribonuclease, and RNA exonuclease (REX), among others.
Pssm-ID: 176648 [Multi-domain] Cd Length: 159 Bit Score: 76.19 E-value: 2.78e-17
exonuclease, DNA polymerase III, epsilon subunit family; All proteins in this family for which ...
6-202
2.36e-05
exonuclease, DNA polymerase III, epsilon subunit family; All proteins in this family for which functions are known are components of the DNA polymerase III complex (epsilon subunit). There is, however, an outgroup that includes paralogs in some gamma-proteobacteria and the n-terminal region of DinG from some low GC gram positive bacteria. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, Degradation of DNA]
Pssm-ID: 129663 [Multi-domain] Cd Length: 217 Bit Score: 43.98 E-value: 2.36e-05
DnaQ-like (or DEDD) 3'-5' exonuclease domain superfamily; The DnaQ-like exonuclease superfamily is a structurally conserved group of 3'-5' exonucleases, which catalyze the excision of nucleoside monophosphates at the DNA or RNA termini in the 3'-5' direction. It is also called the DEDD superfamily, after the four invariant acidic residues present in the catalytic site of its members. The superfamily consists of DNA- and RNA-processing enzymes such as the proofreading domains of DNA polymerases, other DNA exonucleases, RNase D, RNase T, Oligoribonuclease and RNA exonucleases (REX). The DnaQ-like exonuclease domain contains three conserved sequence motifs termed ExoI, ExoII and ExoIII, which 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 conservation patterns of the three motifs may vary among different subfamilies. DnaQ-like exonucleases are classified as DEDDy or DEDDh exonucleases depending on the variation of motif III as YX(3)D or HX(4)D, respectively. The significance of the motif differences is still unclear. Almost all RNase families in this superfamily are present only in eukaryotes and bacteria, but not in archaea, suggesting a later origin, which in some cases are accompanied by horizontal gene transfer.
Pssm-ID: 176647 [Multi-domain] Cd Length: 96 Bit Score: 40.89 E-value: 6.48e-05
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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