β-Lactamases (EC 3.5.2.6) confer resistance against β-lactam group-containing antibiotics in bacteria and higher eukaryotes, including humans. Pathogenic bacterial resistance against β-lactam antibiotics is a primary concern for potential therapeutic developments and drug targets. Here, we report putative β-lactamase activity, sulbactam binding (a β-lactam analogue) in the low μM affinity range, and site-specific interaction studies of a 14 kDa UV- and dark-inducible protein (abbreviated as UVI31+, a BolA homologue) from Chlamydomonas reinhartii. Intriguingly, the solution NMR structure of UVI31 + bears no resemblance to other known β-lactamases; however, the sulbactam binding is found at two sites rich in positively charged residues, mainly at the L2 loop regions and the N-terminus. Using NMR spectroscopy, ITC and MD simulations, we map the ligand binding sites in UVI31 + providing atomic-level insights into its β-lactamase activity. Current study is the first report on β-lactamase activity of UVI31+, a BolA analogue, from C. reinhartii. Furthermore, our mutation studies reveal that the active site serine-55 is crucial for β-lactamase activity.

• Klíčová slova
• ITC, MD, NMR, S55A, Sulbactam, UVI31+, β-lactam antibiotics, β-lactamases,
• MeSH
• beta-laktamasy * chemie   metabolismus   MeSH
• Chlamydomonas reinhardtii * enzymologie   MeSH
• magnetická rezonanční spektroskopie metody   MeSH
• nukleární magnetická rezonance biomolekulární metody   MeSH
• rostlinné proteiny chemie   metabolismus   MeSH
• sekvence aminokyselin MeSH
• simulace molekulární dynamiky MeSH
• sulbaktam chemie   farmakologie   MeSH
• vazba proteinů MeSH
• vazebná místa MeSH
• Publikační typ
• časopisecké články MeSH