Structure and function of extreme TLS DNA polymerase TTEDbh from Thermoanaerobacter tengcongensis.

Abstract

Translesion synthesis (TLS) is a kind of DNA repair that maintains the stability of the genome and ensures the normal growth of life in cells under emergencies. Y-family DNA polymerases, as a kind of error-prone DNA polymerase, mainly perform TLS. Previous studies have suggested that the occurrence of tumors is associated with the overexpression of human DNA polymerase of the Y family. And the combination of Y-family DNA polymerase inhibitors is promising for cancer therapy. Here we report the functional and structural characterization of a member of the Y-family DNA polymerases, TTEDbh. We determine TTEDbh is an extreme TLS polymerase that can cross oxidative damage sites, and further identify the amino acids and novel structures that are critical for DNA binding, synthesis, fidelity, and oxidative damage bypass. Moreover, previously unnoticed structural elements with important functions have been discovered and analyzed. These studies provide a more experimental basis for further elucidating the molecular mechanisms of DNA polymerase in the Y family. It could also shed light on the design of drugs to target tumors.

• Authors: Li-Fei Tian, Hongwei Gao, Shuyu Yang, Yan-Ping Liu, Mingzhou Li, Wenqing Xu, Xiao-Xue Yan
• Journal: International journal of biological macromolecules (Int J Biol Macromol) Vol. 253 Issue Pt 2 Pg. 126770 (Dec 31 2023) ISSN: 1879-0003 [Electronic] Netherlands
• PMID: 37683741 (Publication Type: Journal Article)
• Copyright: Copyright © 2023. Published by Elsevier B.V.

Chemical References

• DNA-Directed DNA Polymerase

Topics

• Humans
• DNA Damage
• DNA-Directed DNA Polymerase (chemistry)
• DNA Repair
• DNA Replication
• Neoplasms