期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 25, 期 3, 页码 233-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41594-018-0034-8
关键词
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资金
- National Key Research and Development Program [2016YFA0500201]
- National Natural Science Foundation of China [31225006, 31700659, 81322023]
- International Early Career Scientist grant from Howard Hughes Medical Institute
- National Basic Research Program of China (973 Program) [2013CB911103, 2014CBA02003, 2014CB542802]
Fusion of the outer mitochondrial membrane is mediated by the dynamin-like GTPase mitofusin (MFN). Here, we determined the structure of the minimal GTPase domain (MGD) of human MFN1 in complex with GDP-BeF3-. The MGD folds into a canonical GTPase fold with an associating four-helix bundle, HB1, and forms a dimer. A potassium ion in the catalytic core engages GDP and BeF3- (GDP-BeF3-). Enzymatic analysis has confirmed that efficient GTP hydrolysis by MFN1 requires potassium. Compared to previously reported MGD structures, the HB1 structure undergoes a major conformational change relative to the GTPase domains, as they move from pointing in opposite directions to point in the same direction, suggesting that a swing of the four-helix bundle can pull tethered membranes closer to achieve fusion. The proposed model is supported by results from in vitro biochemical assays and mitochondria morphology rescue assays in MFN1-deleted cells. These findings offer an explanation for how Charcot-Marie-Tooth neuropathy type 2A (CMT2A)-causing mutations compromise MFN-mediated fusion.
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