PDBsum entry 4jv2

Transferase/DNA

PDB id: 4jv2

Contents

Protein chain

341 a.a.

DNA/RNA

Ligands

DTP

Metals

_CA ×2

Waters ×40

PDB id:

4jv2

Name:

Transferase/DNA

Title:

Ternary complex of gamma-ohpdg adduct modified DNA with DNA (-1 primer) polymerase iv and incoming datp

Structure:

DNA polymerase iv. Chain: a. Synonym: pol iv. Engineered: yes. DNA (5'-d(p Tp (Hn1) p Gp Ap Ap Tp Cp Cp Tp Tp Cp Cp Cp Cp C)-3'). Chain: b. Engineered: yes. DNA (5'-d( Gp Gp Gp Gp Gp Ap Ap Gp Gp Ap Tp Tp C)-3').

Source:

Sulfolobus solfataricus. Organism_taxid: 273057. Strain: atcc 35092 / dsm 1617 / jcm 11322 / p2. Gene: dbh, dpo4, sso2448. Expressed in: escherichia coli. Expression_system_taxid: 562. Synthetic: yes. Synthetic: yes

Resolution:

2.74Å R-factor: 0.209 R-free: 0.265

Authors:

S.Banerjee,G.Shanmugam,M.P.Stone

Key ref:

G.Shanmugam et al. (2013). Ring-opening of the γ-OH-PdG adduct promotes error-free bypass by the Sulfolobus solfataricus DNA polymerase Dpo4. Chem Res Toxicol, 26, 1348-1360. PubMed id: 23947567 DOI: 10.1021/tx400200b

Date:

25-Mar-13 Release date: 28-Aug-13

Protein chain

Q97W02  (DPO4_SULSO) -  DNA polymerase IV from Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)

Seq: 352 a.a.

Struc: 341 a.a.

DNA/RNA chains

T-HN1-G-A-A-T-C-C-T-T-C-C-C-C-C 15 bases

G-G-G-G-G-A-A-G-G-A-T-T-C 13 bases

Enzyme reactions

• Enzyme class: E.C.2.7.7.7 - DNA-directed Dna polymerase.
• Reaction: DNA(n) + a 2'-deoxyribonucleoside 5'-triphosphate = DNA(n+1) + diphosphate

Molecule diagrams generated from .mol files obtained from the KEGG ftp site

Added reference

DOI no: 10.1021/tx400200b

Chem Res Toxicol 26:1348-1360 (2013)

PubMed id: 23947567

Ring-opening of the γ-OH-PdG adduct promotes error-free bypass by the Sulfolobus solfataricus DNA polymerase Dpo4.

G.Shanmugam, I.G.Minko, S.Banerjee, P.P.Christov, I.D.Kozekov, C.J.Rizzo, R.S.Lloyd, M.Egli, M.P.Stone.

ABSTRACT

Acrolein, a mutagenic aldehyde, reacts with deoxyguanosine (dG) to form 3-(2'-deoxy-β-d-erythro-pentofuranosyl)-5,6,7,8-tetrahydro-8-hydroxypyrimido[1,2-a] purin-10(3H)-one (γ-OH-PdG). When placed opposite deoxycytosine (dC) in DNA, γ-OH-PdG undergoes ring-opening to the N(2)-(3-oxopropyl)-dG. Ring-opening of the adduct has been hypothesized to facilitate nonmutagenic bypass, particularly by DNA polymerases of the Y family. This study examined the bypass of γ-OH-PdG by Sulfolobus solfataricus Dpo4, the prototypic Y-family DNA polymerase, using templates that contained the adduct in either the 5'-CXG-3' or the 5'-TXG-3' sequence context. Although γ-OH-PdG partially blocked Dpo4-catalyzed DNA synthesis, full primer extension was observed, and the majority of bypass products were error-free. Conversion of the adduct into an irreversibly ring-opened derivative prior to reaction facilitated bypass and further improved the fidelity. Structures of ternary Dpo4·DNA·dNTP complexes were determined with primers that either were positioned immediately upstream of the lesion (preinsertion complexes) or had a 3'-terminal dC opposite the lesion (postinsertion complexes); the incoming nucleotides, either dGTP or dATP, were complementary to the template 5'-neighbor nucleotide. In both postinsertion complexes, the adduct existed as ring-opened species, and the resulting base-pair featured Watson-Crick hydrogen bonding. The incoming nucleotide paired with the 5'-neighbor template, while the primer 3'-hydroxyl was positioned to facilitate extension. In contrast, γ-OH-PdG was in the ring-closed form in both preinsertion complexes, and the overall structure did not favor catalysis. These data provide insights into γ-OH-PdG chemistry during replication bypass by the Dpo4 DNA polymerase and may explain why γ-OH-PdG-induced mutations due to primer-template misalignment are uncommon.