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Structure of the eukaryotic replicative CMG helicase suggests a pumpjack motion for translocation.

Yuan Z, Bai L, Sun J, Georgescu R, Liu J, O'Donnell ME, Li H
Nat Struct Mol Biol 23 217-24 (2016)
Related entries: 3jc6, 3jc7

Cited: 96 times
EuropePMC logo PMID: 26854665

Abstract

The CMG helicase is composed of Cdc45, Mcm2-7 and GINS. Here we report the structure of the Saccharomyces cerevisiae CMG, determined by cryo-EM at a resolution of 3.7-4.8 Å. The structure reveals that GINS and Cdc45 scaffold the N tier of the helicase while enabling motion of the AAA+ C tier. CMG exists in two alternating conformations, compact and extended, thus suggesting that the helicase moves like an inchworm. The N-terminal regions of Mcm2-7, braced by Cdc45-GINS, form a rigid platform upon which the AAA+ C domains make longitudinal motions, nodding up and down like an oil-rig pumpjack attached to a stable platform. The Mcm ring is remodeled in CMG relative to the inactive Mcm2-7 double hexamer. The Mcm5 winged-helix domain is inserted into the central channel, thus blocking entry of double-stranded DNA and supporting a steric-exclusion DNA-unwinding model.

Reviews - 3jc5 mentioned but not cited (5)

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Articles - 3jc5 mentioned but not cited (9)

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Articles citing this publication (59)

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