{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,4]],"date-time":"2022-04-04T09:50:38Z","timestamp":1649065838424},"reference-count":0,"publisher":"American Society for Microbiology","issue":"4","license":[{"start":{"date-parts":[[1988,4,1]],"date-time":"1988-04-01T00:00:00Z","timestamp":575856000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["Antimicrob Agents Chemother"],"published-print":{"date-parts":[[1988,4]]},"abstract":"<jats:p>Upon investigation of penicillin-binding proteins (PBPs) in Haemophilus influenzae strains, five H. influenzae and seven other Haemophilus strains were tested for whole-cell penicillin binding at either 37 or 42 degrees C. Binding of [35S]penicillin G to H. influenzae PBPs 3a and 3b was drastically reduced at 42 degrees C, while PBP 1a showed a temperature-modulated increase in penicillin binding. Further investigation revealed that growth at 42 degrees C causes altered electrophoretic mobility of PBP 3a on sodium dodecyl sulfate-polyacrylamide gel electrophoresis and that cell labeling performed at 42 degrees C showed the differential penicillin binding to target proteins. All Haemophilus spp. tested showed a similar temperature modulation of penicillin binding. Growth measurement and cell viability studies performed at 42 degrees C permitted correlation of PBP 3 temperature sensitivity to H. influenzae resistance to moxalactam at 42 degrees C, and the probable correlation of PBP 1a increased penicillin binding to the more rapid antibacterial activity of penicillin G against H. influenzae at 42 degrees C. Microscopic examination of Haemophilus cells grown at 42 degrees C revealed filamentous cell formation, supporting a role of PBP 3 in the septation process. Results of this study demonstrate that wild-type H. influenzae strains (and possibly all other Haemophilus spp.) possess PBPs 1a and 3, which have distinct and opposite temperature-modulated penicillin-binding activities.<\/jats:p>","DOI":"10.1128\/aac.32.4.498","type":"journal-article","created":{"date-parts":[[2012,6,28]],"date-time":"2012-06-28T00:04:52Z","timestamp":1340841892000},"page":"498-502","update-policy":"http:\/\/dx.doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":9,"title":["Haemophilus influenzae penicillin-binding proteins 1a and 3 possess distinct and opposite temperature-modulated penicillin-binding activities"],"prefix":"10.1128","volume":"32","author":[{"given":"F","family":"Malouin","sequence":"first","affiliation":[{"name":"Department of Microbiology and Infectious Diseases, University of Calgary Health Sciences Centre, Alberta, Canada."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L E","family":"Bryan","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Infectious Diseases, University of Calgary Health Sciences Centre, Alberta, Canada."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"235","container-title":["Antimicrobial Agents and Chemotherapy"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.asm.org\/doi\/pdf\/10.1128\/AAC.32.4.498","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.asm.org\/doi\/pdf\/10.1128\/AAC.32.4.498","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,2,21]],"date-time":"2022-02-21T15:05:16Z","timestamp":1645455916000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.asm.org\/doi\/10.1128\/AAC.32.4.498"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1988,4]]},"references-count":0,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1988,4]]}},"alternative-id":["10.1128\/AAC.32.4.498"],"URL":"https:\/\/doi.org\/10.1128\/aac.32.4.498","relation":{},"ISSN":["0066-4804","1098-6596"],"issn-type":[{"value":"0066-4804","type":"print"},{"value":"1098-6596","type":"electronic"}],"subject":[],"published":{"date-parts":[[1988,4]]},"assertion":[{"value":"1988-04-01","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}