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Title: Structural Evidence for Dimer-Interface-Driven Regulation of the Type II Cysteine Desulfurase, SufS

Journal Article · · Biochemistry

SufS is a type II cysteine desulfurase and acts as the initial step in the Suf Fe–S cluster assembly pathway. In Escherichia coli, this pathway is utilized under conditions of oxidative stress and is resistant to reactive oxygen species. Mechanistically, this means SufS must shift between protecting a covalent persulfide intermediate and making it available for transfer to the next protein partner in the pathway, SufE. Here, we report five X-ray crystal structures of SufS including a new structure of SufS containing an inward-facing persulfide intermediate on C364. Additional structures of SufS variants with substitutions at the dimer interface show changes in dimer geometry and suggest a conserved β-hairpin structure plays a role in mediating interactions with SufE. Here, these new structures, along with previous HDX-MS and biochemical data, identify an interaction network capable of communication between active-sites of the SufS dimer coordinating the shift between desulfurase and transpersulfurase activities.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Inst. of Health
Grant/Contract Number:
W-31-109-Eng-38; S10_RR25528; S10_RR028976; GM112919
OSTI ID:
1494761
Journal Information:
Biochemistry, Vol. 58, Issue 6; ISSN 0006-2960
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (5)

Hydrogen Sulfide From Cysteine Desulfurase, Not 3-Mercaptopyruvate Sulfurtransferase, Contributes to Sustaining Cell Growth and Bioenergetics in E. coli Under Anaerobic Conditions journal October 2019
Direct observation of intermediates in the SufS cysteine desulfurase reaction reveals functional roles of conserved active-site residues journal June 2019
Snapshots of PLP‐substrate and PLP‐product external aldimines as intermediates in two types of cysteine desulfurase enzymes journal October 2019
A conserved asparagine in a ubiquitin‐conjugating enzyme positions the substrate for nucleophilic attack journal May 2019
The SUF system: an ABC ATPase-dependent protein complex with a role in Fe–S cluster biogenesis journal November 2019