» Articles » PMID: 28334993

The Mechanism of the Glycosylase Reaction with HOGG1 Base-excision Repair Enzyme: Concerted Effect of Lys249 and Asp268 During Excision of 8-oxoguanine

Overview
Specialty Biochemistry
Date 2017 Mar 24
PMID 28334993
Citations 3
Authors
Affiliations
Soon will be listed here.
Abstract

The excision of 8-oxoguanine (oxoG) by the human 8-oxoguanine DNA glycosylase 1 (hOGG1) base-excision repair enzyme was studied by using the QM/MM (M06-2X/6-31G(d,p):OPLS2005) calculation method and nuclear magnetic resonance (NMR) spectroscopy. The calculated glycosylase reaction included excision of the oxoG base, formation of Lys249-ribose enzyme-substrate covalent adduct and formation of a Schiff base. The formation of a Schiff base with ΔG# = 17.7 kcal/mol was the rate-limiting step of the reaction. The excision of the oxoG base with ΔG# = 16.1 kcal/mol proceeded via substitution of the C1΄-N9 N-glycosidic bond with an H-N9 bond where the negative charge on the oxoG base and the positive charge on the ribose were compensated in a concerted manner by NH3+(Lys249) and CO2-(Asp268), respectively. The effect of Asp268 on the oxoG excision was demonstrated with 1H NMR for WT hOGG1 and the hOGG1(D268N) mutant: the excision of oxoG was notably suppressed when Asp268 was mutated to Asn. The loss of the base-excision function was rationalized with QM/MM calculations and Asp268 was confirmed as the electrostatic stabilizer of ribose oxocarbenium through the initial base-excision step of DNA repair. The NMR experiments and QM/MM calculations consistently illustrated the base-excision reaction operated by hOGG1.

Citing Articles

Assessment of hOGG1 Genetic Polymorphism (rs1052133) and DNA Damage in Radiation-Exposed Workers.

Surniyantoro H, Yusuf D, Rahardjo T, Rahajeng N, Kisnanto T, Nurhayati S Asian Pac J Cancer Prev. 2022; 23(12):4005-4012.

PMID: 36579980 PMC: 9971479. DOI: 10.31557/APJCP.2022.23.12.4005.


Hexavalent chromium disrupts chromatin architecture.

VonHandorf A, Zablon H, Puga A Semin Cancer Biol. 2021; 76:54-60.

PMID: 34274487 PMC: 8627925. DOI: 10.1016/j.semcancer.2021.07.009.


Association Between the hOGG1 1245C>G (rs1052133) Polymorphism and Susceptibility to Colorectal Cancer: a Meta-analysis Based on 7010 Cases and 10,674 Controls.

Ghelmani Y, Asadian F, Antikchi M, Dastgheib S, Shaker S, Jafari-Nedooshan J J Gastrointest Cancer. 2020; 52(2):389-398.

PMID: 33025423 DOI: 10.1007/s12029-020-00532-7.

References
1.
David S, OShea V, Kundu S . Base-excision repair of oxidative DNA damage. Nature. 2007; 447(7147):941-50. PMC: 2896554. DOI: 10.1038/nature05978. View

2.
Sychrovsky V, Vokacova Z, Trantirek L . Guanine bases in DNA G-quadruplex adopt nonplanar geometries owing to solvation and base pairing. J Phys Chem A. 2012; 116(16):4144-51. DOI: 10.1021/jp2110049. View

3.
Boiteux S, Radicella J . The human OGG1 gene: structure, functions, and its implication in the process of carcinogenesis. Arch Biochem Biophys. 2000; 377(1):1-8. DOI: 10.1006/abbi.2000.1773. View

4.
Lee S, Radom C, Verdine G . Trapping and structural elucidation of a very advanced intermediate in the lesion-extrusion pathway of hOGG1. J Am Chem Soc. 2008; 130(25):7784-5. PMC: 2878488. DOI: 10.1021/ja800821t. View

5.
Radicella J, Dherin C, Desmaze C, Fox M, Boiteux S . Cloning and characterization of hOGG1, a human homolog of the OGG1 gene of Saccharomyces cerevisiae. Proc Natl Acad Sci U S A. 1997; 94(15):8010-5. PMC: 21547. DOI: 10.1073/pnas.94.15.8010. View