ArticleBiochemistry2022
Mechanistic Insights into IscU Conformation Regulation for Fe-S Cluster Biogenesis Revealed by Variable Temperature Electrospray Ionization Native Ion Mobility Mass Spectrometry.
Article in Biochemistry, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
What it found
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Who cites it
5 citing papers in PubMed, 10 citations in OpenAlex.
- Structural heterogeneity of iron-sulfur cluster scaffold protein IscU: Metamorphic or partially folded?Structural dynamics (Melville, N.Y.) · 2026Review
- Intricacies in iron-sulfur cluster function and biogenesis: functional versatility, sulfur sources, and enzyme specificity.RSC chemical biology · 2026Review
- IscS Kinetics in Native Mass Spectrometry Buffers Reveal Key Physiochemical Properties that Influence Enzyme Activity.Journal of the American Society for Mass Spectrometry · 2026Article
- Structure of a putative immature form of a Rieske-type iron-sulfur protein in complex with zinc chloride.Communications chemistry · 2023Article
- Dissecting the Thermodynamics of ATP Binding to GroEL One Nucleotide at a Time.ACS central science · 2023Article
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
Abstract
Iron-sulfur (Fe-S) cluster (ISC) cofactors are required for the function of many critical cellular processes. In the ISC Fe-S cluster biosynthetic pathway, IscU assembles Fe-S cluster intermediates from iron, electrons, and inorganic sulfur, which is provided by the cysteine desulfurase enzyme IscS. IscU also binds to Zn, which mimics and competes for binding with the Fe-S cluster. Crystallographic and nuclear magnetic resonance spectroscopic studies reveal that IscU is a metamorphic protein that exists in multiple conformational states, which include at least a structured form and a disordered form. The structured form of IscU is favored by metal binding and is stable in a narrow temperature range, undergoing both cold and hot denaturation. Interestingly, the form of IscU that binds IscS and functions in Fe-S cluster assembly remains controversial. Here, results from variable temperature electrospray ionization (vT-ESI) native ion mobility mass spectrometry (nIM-MS) establish that IscU exists in structured, intermediate, and disordered forms that rearrange to more extended conformations at higher temperatures. A comparison of Zn-IscU and apo-IscU reveals that Zn(II) binding attenuates the cold/heat denaturation of IscU, promotes refolding of IscU, favors the structured and intermediate conformations, and inhibits the disordered high charge states. Overall, these findings provide a structural rationalization for the role of Zn(II) in stabilizing IscU conformations and IscS in altering the IscU active site to prepare for Zn(II) release and cluster synthesis. This work highlights how vT-ESI-nIM-MS can be applied as a powerful tool in mechanistic enzymology by providing details of relationships among temperature, protein conformations, and ligand/protein binding.
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