期刊
STRUCTURE
卷 17, 期 2, 页码 211-222出版社
CELL PRESS
DOI: 10.1016/j.str.2008.11.010
关键词
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资金
- NIH Cellular and Molecular Biology Training [T32 GM007283]
- American Cancer Society
- National Science Foundation [MCB-023841]
The minichromosome maintenance (MCM) proteins, members of the AAA+ (ATPase associated with diverse cellular activities) superfamily, are believed to constitute the replicative helicase in eukaryotic and archaeal species. Here, we present the 1.9 A resolution crystal structure of a monomeric MCM homolog from Methanopyrus kandleri, the first crystallographic structure of a full-length MCM. We also present an 18 angstrom cryo-electron microscopy reconstruction of the hexameric MCM from Methanothermobacter thermautotrophicus, and fit the atomic resolution crystal structure into the reconstruction in order to generate an atomic model for the oligomeric assembly. These structural data reveal a distinct active site topology consisting of a unique arrangement of critical determinants. The structures also provide a molecular framework for understanding the functional contributions of trans-acting elements that facilitate intersubunit crosstalk in response to DNA binding and ATP hydrolysis.
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