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Title: A conformational role for NifW in the maturation of molybdenum nitrogenase P-cluster

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/D1SC06418E· OSTI ID:1847963

Reduction of dinitrogen by molybdenum nitrogenase relies on complex metalloclusters: the [8Fe:7S] P-cluster and the [7Fe:9S:Mo:C:homocitrate] FeMo-cofactor. Although both clusters bear topological similarities and require the reductive fusion of [4Fe:4S] sub-clusters to achieve their respective assemblies, P-clusters are assembled directly on the NifD2K2 polypeptide prior to the insertion of FeMo-co, which is fully assembled separately from NifD2K2. P-cluster maturation involves the iron protein NifH2 as well as several accessory proteins, whose role has not been elucidated. In the present work, two NifD2K2 species bearing immature P-clusters were isolated from an Azotobacter vinelandii strain in which the genes encoding NifH and the accessory protein NifZ were deleted, and characterized by X-ray absorption spectroscopy and EPR. These analyses showed that both NifD2K2 complexes harbor clusters that are electronically and structurally similar, with each NifDK unit containing two [4Fe:4S]2+/+ clusters. Binding of the accessory protein NifW parallels a decrease in the distance between these clusters, as well as a subtle change in their coordination. These results support a conformational role for NifW in P-cluster biosynthesis, bringing the two [4Fe:4S] precursors closer prior to their fusion, which may be crucial in challenging cellular contexts.

Research Organization:
Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Max-Planck Society; Peter und Traudl Engelhorn Stiftung; Bill and Melinda Gates Foundation
Grant/Contract Number:
SC0010834; SC0010867; AC02-76SF00515; OPP1143172; INV-005889
OSTI ID:
1847963
Alternate ID(s):
OSTI ID: 1904224
Journal Information:
Chemical Science, Journal Name: Chemical Science Vol. 13 Journal Issue: 12; ISSN 2041-6520
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United Kingdom
Language:
English

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