9bsm
From Proteopedia
Staphylococcus aureus exfoliative toxin A D164E variant
Structural highlights
FunctionETA_STAAU Has serine protease-like properties and binds to the skin protein profilaggrin. Cleaves substrates after acidic residues. Exfoliative toxins cause impetigous diseases commonly referred as staphylococcal scalded skin syndrome (SSSS).[1] [2] Publication Abstract from PubMedSerine proteases have been proposed to dynamically sample inactive and active conformations, but direct evidence at atomic resolution has remained elusive. Using nuclear magnetic resonance (NMR), we identified a single residue, D164, in exfoliative toxin A (ETA) that acts as a molecular "switch" to regulate global dynamic sampling. Mutations at this site shift the balance between inactive and active states, correlating directly with catalytic activity. Beyond identifying this dynamic switch, we demonstrate how it works in concert with other allosterically coupled sites to rationally control enzyme movements and catalytic function. This study provides a framework for linking conformational dynamics to function and paves the way for engineering enzymes, in particular, proteases, with tailored activities for applications in medicine and biotechnology. Identifying and controlling inactive and active conformations of a serine protease.,Lee E, Tran N, Redzic JS, Singh H, Alamillo L, Holyoak T, Hamelberg D, Eisenmesser EZ Sci Adv. 2025 Apr 11;11(15):eadu7447. doi: 10.1126/sciadv.adu7447. Epub 2025 Apr , 9. PMID:40203097[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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