{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T18:21:22Z","timestamp":1773166882152,"version":"3.50.1"},"reference-count":28,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2022,5,10]],"date-time":"2022-05-10T00:00:00Z","timestamp":1652140800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100007620","name":"Liaoning Provincial Education Department","doi-asserted-by":"publisher","award":["2017LZD05"],"award-info":[{"award-number":["2017LZD05"]}],"id":[{"id":"10.13039\/501100007620","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100007620","name":"Liaoning Provincial Education Department","doi-asserted-by":"publisher","award":["2019LZD03"],"award-info":[{"award-number":["2019LZD03"]}],"id":[{"id":"10.13039\/501100007620","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,7,30]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>A structurally unique aminoglycoside produced in Streptoalloteichus tenebrarius, Apramycin is used in veterinary medicine or the treatment of Salmonella, Escherichia coli, and Pasteurella multocida infections. Although apramycin was discovered nearly 50 years ago, many biosynthetic steps of apramycin remain unknown. In this study, we identified a HemK family methyltransferase, AprI, to be the 7\u2019-N-methyltransferase in apramycin biosynthetic pathway. Biochemical experiments showed that AprI converted demethyl-aprosamine to aprosamine. Through gene disruption of aprI, we identified a new aminoglycoside antibiotic demethyl-apramycin as the main product in aprI disruption strain. The demethyl-apramycin is an impurity in apramycin product. In addition to demethyl-apramycin, carbamyltobramycin is another major impurity. However, unlike demethyl-apramycin, tobramycin is biosynthesized by an independent biosynthetic pathway in S. tenebrarius. The titer and rate of apramycin were improved by overexpression of the aprI and disruption of the tobM2, which is a crucial gene for tobramycin biosynthesis. The titer of apramycin increased from 2227 \u00b1 320 mg\/L to 2331 \u00b1 210 mg\/L, while the titer of product impurity demethyl-apramycin decreased from 196 \u00b1 36 mg\/L to 51 \u00b1 9 mg\/L. Moreover, the carbamyltobramycin titer of the wild-type strain was 607 \u00b1 111 mg\/L and that of the engineering strain was null. The rate of apramycin increased from 68% to 87% and that of demethyl-apramycin decreased from 1.17% to 0.34%.<\/jats:p>","DOI":"10.1093\/jimb\/kuac011","type":"journal-article","created":{"date-parts":[[2022,5,7]],"date-time":"2022-05-07T11:07:29Z","timestamp":1651921649000},"source":"Crossref","is-referenced-by-count":3,"title":["Characterization and utilization of methyltransferase for apramycin production in <i>Streptoalloteichus tenebrarius<\/i>"],"prefix":"10.1093","volume":"49","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0937-3300","authenticated-orcid":false,"given":"Junyang","family":"Sun","sequence":"first","affiliation":[{"name":"School of Life Science and Biopharmaceutics, Shenyang Pharmaceutical University , Shenyang 110016 , People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hongjing","family":"Gao","sequence":"additional","affiliation":[{"name":"School of Life Science and Biopharmaceutics, Shenyang Pharmaceutical University , Shenyang 110016 , People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Danyang","family":"Yan","sequence":"additional","affiliation":[{"name":"School of Life Science and Biopharmaceutics, Shenyang Pharmaceutical University , Shenyang 110016 , People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Life Science and Biopharmaceutics, Shenyang Pharmaceutical University , Shenyang 110016 , People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xianpu","family":"Ni","sequence":"additional","affiliation":[{"name":"School of Life Science and Biopharmaceutics, Shenyang Pharmaceutical University , Shenyang 110016 , People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Huanzhang","family":"Xia","sequence":"additional","affiliation":[{"name":"School of Life Science and 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