7T1A image
Entry Detail
PDB ID:
7T1A
Keywords:
Title:
Rev1 Ternary Complex with dATP and Ca2+
Biological Source:
PDB Version:
Deposition Date:
2021-12-01
Release Date:
2022-05-25
Method Details:
Experimental Method:
Resolution:
1.81 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:DNA repair protein REV1
Chain IDs:C (auth: A)
Chain Length:451
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*GP*GP*GP*GP*TP*GP*TP*GP*GP*TP*AP*G)-3')
Chain IDs:A (auth: P)
Chain Length:12
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*AP*TP*CP*GP*CP*TP*AP*CP*CP*AP*CP*AP*CP*CP*CP*C)-3')
Chain IDs:B (auth: T)
Chain Length:17
Number of Molecules:1
Biological Source:synthetic construct
Primary Citation
Mechanism of nucleotide discrimination by the translesion synthesis polymerase Rev1.
Nat Commun 13 2876 2876 (2022)
PMID: 35610266 DOI: 10.1038/s41467-022-30577-0

Abstact

Rev1 is a translesion DNA synthesis (TLS) polymerase involved in the bypass of adducted-guanine bases and abasic sites during DNA replication. During damage bypass, Rev1 utilizes a protein-template mechanism of DNA synthesis, where the templating DNA base is evicted from the Rev1 active site and replaced by an arginine side chain that preferentially binds incoming dCTP. Here, we utilize X-ray crystallography and molecular dynamics simulations to obtain structural insight into the dCTP specificity of Rev1. We show the Rev1 R324 protein-template forms sub-optimal hydrogen bonds with incoming dTTP, dGTP, and dATP that prevents Rev1 from adopting a catalytically competent conformation. Additionally, we show the Rev1 R324 protein-template forms optimal hydrogen bonds with incoming rCTP. However, the incoming rCTP adopts an altered sugar pucker, which prevents the formation of a catalytically competent Rev1 active site. This work provides novel insight into the mechanisms for nucleotide discrimination by the TLS polymerase Rev1.

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