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Conformational dynamics of a multienzyme complex in anaerobic carbon fixation.
Science
January 2025
Redox and Metalloprotein Research Group, Max Planck Institute of Biophysics, Frankfurt am Main, Germany.
In the ancient microbial Wood-Ljungdahl pathway, carbon dioxide (CO) is fixed in a multistep process that ends with acetyl-coenzyme A (acetyl-CoA) synthesis at the bifunctional carbon monoxide dehydrogenase/acetyl-CoA synthase complex (CODH/ACS). In this work, we present structural snapshots of the CODH/ACS from the gas-converting acetogen , characterizing the molecular choreography of the overall reaction, including electron transfer to the CODH for CO reduction, methyl transfer from the corrinoid iron-sulfur protein (CoFeSP) partner to the ACS active site, and acetyl-CoA production. Unlike CODH, the multidomain ACS undergoes large conformational changes to form an internal connection to the CODH active site, accommodate the CoFeSP for methyl transfer, and protect the reaction intermediates.
View Article and Find Full Text PDFTIR signaling activates caspase-like immunity in bacteria.
Science
January 2025
Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.
Caspase family proteases and Toll/interleukin-1 receptor (TIR)-domain proteins have central roles in innate immunity and regulated cell death in humans. We describe a bacterial immune system comprising both a caspase-like protease and a TIR-domain protein. We found that the TIR protein, once it recognizes phage invasion, produces the previously unknown immune signaling molecule adenosine 5'-diphosphate-cyclo[N7:1'']-ribose (N7-cADPR).
View Article and Find Full Text PDFComputational analysis of the effect of a binding protein (RbpA) on the dynamics of Mycobacterium tuberculosis RNA polymerase assembly.
PLoS One
January 2025
Molecular Biophysics Unit, Indian Institute of Science, Bengaluru, Karnataka, India.
Article Synopsis
- RbpA is a critical protein for Mycobacterium tuberculosis growth, impacting transcription and antibiotic response, but its regulatory mechanisms are not fully understood.
- Significant structural changes in RNA polymerase occur when it interacts with RbpA, revealing important amino acids for transcription regulation and dynamic behavior of the complex.
- The study identifies potential ligands for RbpA's interaction site, laying the groundwork for future research on developing inhibitors that target RbpA's regulatory role in transcription.
Analysis of glutamate-dependent mechanism and optimization of fermentation conditions for poly-gamma-glutamic acid production by Bacillus subtilis SCP017-03.
PLoS One
January 2025
College of life Sciences, Sichuan Normal University, Chengdu, Sichuan, China.
Poly-gamma-glutamic acid (γ-PGA) is mainly synthesized by glutamate-dependent strains in the manufacturing industry. Therefore, understanding glutamate-dependent mechanisms is imperative. In this study, we first systematically analyzed the response of Bacillus subtilis SCP017-03 to glutamate addition by comparing transcriptomics and proteomics.
View Article and Find Full Text PDFGuards and decoys: RIPoptosome and inflammasome pathway regulators of bacterial effector-triggered immunity.
PLoS Pathog
January 2025
Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, United States of America.
Virulent microbes produce proteins that interact with host cell targets to promote pathogenesis. For example, virulent bacterial pathogens have proteins called effectors that are typically enzymes and are secreted into host cells. To detect and respond to the activities of effectors, diverse phyla of host organisms evolved effector-triggered immunity (ETI).
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