Synthesis of N2-Deoxyguanosine Modified DNAs and the Studies on Their Translesion Synthesis by the E. coli DNA Polymerase IV.
J Org Chem
; 84(4): 1734-1747, 2019 02 15.
Article
em En
| MEDLINE
| ID: mdl-30628447
ABSTRACT
We report the synthesis of N2-aryl (benzyl, naphthyl, anthracenyl, and pyrenyl)-deoxyguanosine (dG) modified phosphoramidite building blocks and the corresponding damaged DNAs. Primer extension studies using E. coli Pol IV, a translesion polymerase, demonstrate that translesion synthesis (TLS) across these N2-dG adducts is error free. However, the efficiency of TLS activity decreases with increase in the steric bulkiness of the adducts. Molecular dynamics simulations of damaged DNA-Pol IV complexes reveal the van der Waals interactions between key amino acid residues (Phe13, Ile31, Gly32, Gly33, Ser42, Pro73, Gly74, Phe76, and Tyr79) of the enzyme and adduct that help to accommodate the bulky damages in a hydrophobic pocket to facilitate TLS. Overall, the results presented here provide insights into the TLS across N2-aryl-dG damaged DNAs by Pol IV.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
DNA Polimerase beta
/
Desoxiguanosina
/
Escherichia coli
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article