Visualizing the DNA repair process by a photolyase at atomic resolution.
Science
; 382(6674): eadd7795, 2023 12.
Article
em En
| MEDLINE
| ID: mdl-38033054
ABSTRACT
Photolyases, a ubiquitous class of flavoproteins, use blue light to repair DNA photolesions. In this work, we determined the structural mechanism of the photolyase-catalyzed repair of a cyclobutane pyrimidine dimer (CPD) lesion using time-resolved serial femtosecond crystallography (TR-SFX). We obtained 18 snapshots that show time-dependent changes in four reaction loci. We used these results to create a movie that depicts the repair of CPD lesions in the picosecond-to-nanosecond range, followed by the recovery of the enzymatic moieties involved in catalysis, completing the formation of the fully reduced enzyme-product complex at 500 nanoseconds. Finally, back-flip intermediates of the thymine bases to reanneal the DNA were captured at 25 to 200 microseconds. Our data cover the complete molecular mechanism of a photolyase and, importantly, its chemistry and enzymatic catalysis at work across a wide timescale and at atomic resolution.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Dímeros de Pirimidina
/
Methanosarcina
/
Proteínas Arqueais
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Desoxirribodipirimidina Fotoliase
/
Reparo do DNA
Idioma:
En
Revista:
Science
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Taiwan