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The heterotrimeric PCNA of the hyperthermophilic archaeon Sulfolobus solfatricus: implications for the clamp loading mechanism.

journal contribution
posted on 2023-06-07, 19:53 authored by Isabelle Dionne, Ravi K Nookala, Stephen P Jackson, Aidan DohertyAidan Doherty, Stephen D Bell
The sliding clamp, PCNA, of the archaeon Sulfolobus solfataricus P2 is a heterotrimer of three distinct subunits (PCNA1, 2, and 3) that assembles in a defined manner. The PCNA heterotrimer, but not individual subunits, stimulates the activities of the DNA polymerase, DNA ligase I, and the flap endonuclease (FEN1) of S. solfataricus. Distinct PCNA subunits contact DNA polymerase, DNA ligase, or FEN1, imposing a defined architecture at the lagging strand fork and suggesting the existence of a preformed scanning complex at the fork. This provides a mechanism to tightly couple DNA synthesis and Okazaki fragment maturation. Additionally, unique subunit-specific interactions between components of the clamp loader, RFC, suggest a model for clamp loading of PCNA.

History

Publication status

  • Published

Journal

Molecular Cell

ISSN

1097-2765

Issue

1

Volume

11

Page range

275-282

Pages

8.0

Department affiliated with

  • Sussex Centre for Genome Damage Stability Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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