Mobile origin-licensing factors confer resistance to conflicts with RNA polymerase.
Cell Rep
; 38(12): 110531, 2022 03 22.
Article
en En
| MEDLINE
| ID: mdl-35320708
Fundamental to our understanding of chromosome duplication is the idea that replication origins function both as sites where MCM helicases are loaded during the G1 phase and where synthesis begins in S phase. However, the temporal delay between phases exposes the replisome assembly pathway to potential disruption prior to replication. Using multicolor, single-molecule imaging, we systematically study the consequences of encounters between actively transcribing RNA polymerases (RNAPs) and replication initiation intermediates in the context of chromatin. We demonstrate that RNAP can push multiple licensed MCM helicases over long distances with nucleosomes ejected or displaced. Unexpectedly, we observe that MCM helicase loading intermediates also can be repositioned by RNAP and continue origin licensing after encounters with RNAP, providing a web of alternative origin specification pathways. Taken together, our observations reveal a surprising mobility in origin-licensing factors that confers resistance to the complex challenges posed by diverse obstacles encountered on chromosomes.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Origen de Réplica
/
Replicación del ADN
Idioma:
En
Revista:
Cell Rep
Año:
2022
Tipo del documento:
Article
País de afiliación:
Alemania
Pais de publicación:
Estados Unidos