Reference: Jeruzalmi D, et al. (2001) Crystal structure of the processivity clamp loader gamma (gamma) complex of E. coli DNA polymerase III. Cell 106(4):429-41

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Abstract


The gamma complex, an AAA+ ATPase, is the bacterial homolog of eukaryotic replication factor C (RFC) that loads the sliding clamp (beta, homologous to PCNA) onto DNA. The 2.7/3.0 A crystal structure of gamma complex reveals a pentameric arrangement of subunits, with stoichiometry delta':gamma(3):delta. The C-terminal domains of the subunits form a circular collar that supports an asymmetric arrangement of the N-terminal ATP binding domains of the gamma motor and the structurally related domains of the delta' stator and the delta wrench. The structure suggests a mechanism by which the gamma complex switches between a closed state, in which the beta-interacting element of delta is hidden by delta', and an open form similar to the crystal structure, in which delta is free to bind to beta.

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Journal Article | Research Support, U.S. Gov't, P.H.S.
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Jeruzalmi D, O'Donnell M, Kuriyan J
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