期刊
MOLECULAR CELL
卷 6, 期 6, 页码 1449-1460出版社
CELL PRESS
DOI: 10.1016/S1097-2765(00)00141-6
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资金
- NIAID NIH HHS [AI30492] Funding Source: Medline
- NIGMS NIH HHS [GM52543] Funding Source: Medline
Salmonella spp. utilize a specialized protein secretion system to deliver a battery of effector proteins into host cells. Several of these effecters stimulate Cdc42- and Rad-dependent cytoskeletal changes that promote bacterial internalization. These potentially cytotoxic alterations are rapidly reversed by the effector SptP, a tyrosine phosphatase and GTPase activating protein (GAP) that targets Cdc42 and Rac1. The 2.3 Angstrom resolution crystal structure of an SptP-Rac1 transition state complex reveals an unusual GAP architecture that mimics host functional homologs. The phosphatase domain possesses a conserved active site but distinct surface properties. Binding to Rad induces a dramatic stabilization in SptP of a four-helix bundle that makes extensive contacts with the Switch I and Switch II regions of the GTPase.
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