Interlocking activities of DNA polymerase ß in the base excision repair pathway.
Proc Natl Acad Sci U S A
; 119(10): e2118940119, 2022 03 08.
Article
em En
| MEDLINE
| ID: mdl-35238634
ABSTRACT
SignificanceBase excision repair (BER) is one of the major DNA repair pathways used to fix a myriad of cellular DNA lesions. The enzymes involved in BER, including DNA polymerase ß (Polß), have been identified and characterized, but how they act together to efficiently perform BER has not been fully understood. Through gel electrophoresis, mass spectrometry, and kinetic analysis, we discovered that the two enzymatic activities of Polß can be interlocked, rather than functioning independently from each other, when processing DNA intermediates formed in BER. The finding prompted us to hypothesize a modified BER pathway. Through conventional and time-resolved X-ray crystallography, we solved 11 high-resolution crystal structures of cross-linked Polß complexes and proposed a detailed chemical mechanism for Polß's 5'-deoxyribose-5-phosphate lyase activity.
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Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Dano ao DNA
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DNA Polimerase beta
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Reparo do DNA
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Ano de publicação:
2022
Tipo de documento:
Article