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dc.contributor.authorBoyer, Nathaniel R.
dc.contributor.authorTokmina-Lukaszewska, Monika
dc.contributor.authorBueno Batista, Marcelo
dc.contributor.authorMus, Florence
dc.contributor.authorDixon, Ray
dc.contributor.authorBothner, Brian
dc.contributor.authorPeters, John W.
dc.identifier.citationBoyer, N. R., Tokmina-Lukaszewska, M., Bueno Batista, M., Mus, F., Dixon, R., Bothner, B., & Peters, J. W. (2023). Structural insights into redox signal transduction mechanisms in the control of nitrogen fixation by the NifLA system. Proceedings of the National Academy of Sciences, 120(30), e2302732120.en_US
dc.description.abstractNifL is a conformationally dynamic flavoprotein responsible for regulating the activity of the σ54-dependent activator NifA to control the transcription of nitrogen fixation (nif) genes in response to intracellular oxygen, cellular energy, or nitrogen availability. The NifL-NifA two-component system is the master regulatory system for nitrogen fixation. NifL serves as a sensory protein, undergoing signal-dependent conformational changes that modulate its interaction with NifA, forming the NifL–NifA complex, which inhibits NifA activity in conditions unsuitable for nitrogen fixation. While NifL-NifA regulation is well understood, these conformationally flexible proteins have eluded previous attempts at structure determination. In work described here, we advance a structural model of the NifL dimer supported by a combination of scattering techniques and mass spectrometry (MS)-coupled structural analyses that report on the average structure in solution. Using a combination of small angle X-ray scattering-derived electron density maps and MS-coupled surface labeling, we investigate the conformational dynamics responsible for NifL oxygen and energy responses. Our results reveal conformational differences in the structure of NifL under reduced and oxidized conditions that provide the basis for a model for modulating NifLA complex formation in the regulation of nitrogen fixation in response to oxygen in the model diazotroph, Azotobacter vinelandii.en_US
dc.publisherProceedings of the National Academy of Sciencesen_US
dc.subjectstructural insightsen_US
dc.subjectredox signalen_US
dc.subjecttransduction mechanismsen_US
dc.subjectnitrogen fixationen_US
dc.subjectNifLA systemen_US
dc.titleStructural insights into redox signal transduction mechanisms in the control of nitrogen fixation by the NifLA systemen_US
mus.citation.journaltitleProceedings of the National Academy of Sciencesen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentChemistry & Biochemistry.en_US
mus.relation.universityMontana State University - Bozemanen_US

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