7poy
Spin labeled IPNS S55C variant in complex with Fe, ACV and NO
Structural highlights
FunctionIPNA_EMENI Isopenicillin N synthase; part of the gene cluster that mediates the biosynthesis of penicillin, the world's most important antibiotic (PubMed:11755401, PubMed:3319778). IpnA catalyzes the cyclization of the tripeptide N-[(5S)-5-amino-5-carboxypentanoyl]-L-cysteinyl-D-valine (LLD-ACV or ACV) to form isopenicillin N (IPN) that contains the beta-lactam nucleus (PubMed:11755401, PubMed:28703303, PubMed:3319778). The penicillin biosynthesis occurs via 3 enzymatic steps, the first corresponding to the production of the tripeptide N-[(5S)-5-amino-5-carboxypentanoyl]-L-cysteinyl-D-valine (LLD-ACV or ACV) by the NRPS acvA. The tripeptide ACV is then cyclized to isopenicillin N (IPN) by the isopenicillin N synthase ipnA that forms the beta-lactam nucleus. Finally, the alpha-aminoadipyl side chain is exchanged for phenylacetic acid by the isopenicillin N acyltransferase penDE to yield penicillin in the peroxisomal matrix (By similarity).[UniProtKB:P08703][1] [2] [3] Publication Abstract from PubMedIsopenicillin N synthase (IPNS) catalyzes formation of the beta-lactam and thiazolidine rings of isopenicillin N from its linear tripeptide l-delta-(alpha-aminoadipoyl)-l-cysteinyl-d-valine (ACV) substrate in an iron- and dioxygen (O(2))-dependent four-electron oxidation without precedent in current synthetic chemistry. Recent X-ray free-electron laser studies including time-resolved serial femtosecond crystallography show that binding of O(2) to the IPNS-Fe(II)-ACV complex induces unexpected conformational changes in alpha-helices on the surface of IPNS, in particular in alpha3 and alpha10. However, how substrate binding leads to conformational changes away from the active site is unknown. Here, using detailed (19)F NMR and electron paramagnetic resonance experiments with labeled IPNS variants, we investigated motions in alpha3 and alpha10 induced by binding of ferrous iron, ACV, and the O(2) analog nitric oxide, using the less mobile alpha6 for comparison. (19)F NMR studies were carried out on singly and doubly labeled alpha3, alpha6, and alpha10 variants at different temperatures. In addition, double electron-electron resonance electron paramagnetic resonance analysis was carried out on doubly spin-labeled variants. The combined spectroscopic and crystallographic results reveal that substantial conformational changes in regions of IPNS including alpha3 and alpha10 are induced by binding of ACV and nitric oxide. Since IPNS is a member of the structural superfamily of 2-oxoglutarate-dependent oxygenases and related enzymes, related conformational changes may be of general importance in nonheme oxygenase catalysis. Spectroscopic studies reveal details of substrate-induced conformational changes distant from the active site in isopenicillin N synthase.,Rabe P, Walla CC, Goodyear NK, Welsh J, Southwart R, Clifton I, Linyard JDS, Tumber A, Claridge TDW, Myers WK, Schofield CJ J Biol Chem. 2022 Sep;298(9):102249. doi: 10.1016/j.jbc.2022.102249. Epub 2022 , Jul 11. PMID:35835215[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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