期刊
NATURE CHEMISTRY
卷 10, 期 5, 页码 568-572出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41557-018-0029-4
关键词
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资金
- NIH-NIGMS [GM67626]
- DOE-BES grant [DE-DC0014470]
- Takeda Science Foundation
- Ministry of Education, Culture, Sports, Science and Technology, Japan [23000007, 16H04116]
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM067626] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON DEAFNESS AND OTHER COMMUNICATION DISORDERS [R01DC014470] Funding Source: NIH RePORTER
The M-cluster is the [(homocitrate) MoFe7S9C] active site of nitrogenase that is derived from an 8Fe core assembled via coupling and rearrangement of two [Fe4S4] clusters concomitant with the insertion of an interstitial carbon and a 'ninth sulfur'. Combining synthetic [Fe4S4] clusters with an assembly protein template, here we show that sulfite can give rise to the ninth sulfur that is incorporated in the catalytically important belt region of the cofactor after the radical S-adenosyl-l-methion-inedependent carbide insertion and the concurrent 8Fe-core rearrangement have already taken place. Based on the differential reactivity of the formed cluster species, we also propose a new [Fe8S8C] cluster intermediate, the L*-cluster, which is similar to the [Fe8S9C] L-cluster, but lacks the ninth sulfur from sulfite. This work provides a semi-synthetic tool for protein reconstitution that could be widely applicable for the functional analysis of other FeS systems.
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