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Crystal structure of thermostable DNA photolyase: pyrimidine-dimer recognition mechanism.

Authors
  • Komori, H
  • Masui, R
  • Kuramitsu, S
  • Yokoyama, S
  • Shibata, T
  • Inoue, Y
  • Miki, K
Type
Published Article
Journal
Proceedings of the National Academy of Sciences of the United States of America
Publication Date
Nov 20, 2001
Volume
98
Issue
24
Pages
13560–13565
Identifiers
PMID: 11707580
Source
Medline
License
Unknown

Abstract

DNA photolyase is a pyrimidine-dimer repair enzyme that uses visible light. Photolyase generally contains two chromophore cofactors. One is a catalytic cofactor directly contributing to the repair of a pyrimidine-dimer. The other is a light-harvesting cofactor, which absorbs visible light and transfers energy to the catalytic cofactor. Photolyases are classified according to their second cofactor into either a folate- or deazaflavin-type. The native structures of both types of photolyases have already been determined, but the mechanism of substrate recognition remains largely unclear because of the lack of structural information regarding the photolyase-substrate complex. Photolyase from Thermus thermophilus, the first thermostable class I photolyase found, is favorable for function analysis, but even the type of the second cofactor has not been identified. Here, we report the crystal structures of T. thermophilus photolyase in both forms of the native enzyme and the complex along with a part of its substrate, thymine. A structural comparison with other photolyases suggests that T. thermophilus photolyase has structural features allowing for thermostability and that its light-harvesting cofactor binding site bears a close resemblance to a deazaflavin-type photolyase. One thymine base is found at the hole, a putative substrate-binding site near the catalytic cofactor in the complex form. This structural data for the photolyase-thymine complex allow us to propose a detailed model for the pyrimidine-dimer recognition mechanism.

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