DNA polymerase IV - Q47155 (DPO4_ECOLI)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q47155: 30
 
Function
Poorly processive, error-prone DNA polymerase involved in translesion repair and untargeted mutagenesis (PubMed:10488344, PubMed:10801133). Copies undamaged DNA at stalled replication forks, which arise in vivo from mismatched or misaligned primer ends. These misaligned primers can be extended by Pol IV. Exhibits no 3'-5' exonuclease (proofreading) activity (PubMed:10488344). Overexpression of Pol IV results in increased frameshift mutagenesis. It is required for stationary-phase adaptive mutation, which provides the bacterium with flexibility in dealing with environmental stress, enhancing long-term survival and evolutionary fitness. Not seen to be involved in translesion snythesis even when stimulated by the beta slding-clamp and clamp-loading complex, which do however increase non-targeted DNA polymerase efficiency 3,000-fold, may be due to targeting to stalled replication forks on nondamaged DNA (PubMed:10801133, PubMed:16168375). Involved in translesional synthesis, in conjunction with the beta clamp from PolIII (PubMed:14592985, PubMed:14729336). UniProt
Catalytic Activity
a 2'-deoxyribonucleoside 5'-triphosphate + DNAn = diphosphate + DNAn+1 UniProt
Pathway Maps
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Subunit Structure
Monomer. Interacts with beta sliding clamp, which confers increased processivity (PubMed:14592985, PubMed:14729336,PubMed:16168375). UniProt
Domain
The catalytic core consists of fingers, palm and thumb subdomains, but the fingers and thumb subdomains are much smaller than in high-fidelity polymerases; residues from five sequence motifs of the Y-family cluster around an active site cleft that can accommodate DNA and nucleotide substrates with relaxed geometric constraints, with consequently higher rates of misincorporation and low processivity. It lacks the O helices present in high-fidelity DNA polymerases in the fingers domain (By similarity). UniProt
  • Other Gene names: dinB, dinP, b0231, JW0221
This protein in other organisms (by gene name):
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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Validation Track

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Data in red indicates combined ranges of Homology Models from the SWISS-MODEL Repository  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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