A Polysaccharide-Degrading Marine Bacterium Flammeovirga sp.MY04 and Its Extracellular Agarase System-中国期刊网

摘要 BacteriaofthegenusFlammeovirgacandigestcomplexpolysaccharides(CPs),butnodetailshavebeenreportedregardingtheCPdepolymerasesofthesebacteria.MY04,anagarolyticmarinebacteriumisolatedfromcoastalsediments,hasbeenidentifiedasanewmemberofthegenusFlammeovirga.TheMY04strainisabletoutilizemultipleCPsasasolecarbonsourceandgrowswellonagarose,mannan,orxylan.Thisstrainproduceshighconcentrationsofextracellularproteins(490mgL-1±18.2mgL-1liquidculture)thatexhibitefficientandextensivedegradationactivitiesonvariouspolysaccharides,especiallyagarose.Theseproteinshaveanactivityof310Umg-1±9.6Umg-1proteins.Theextracellularagarasesystem(EAS)inthecrudeextracellularenzymescontainsatleastfouragarosedepolymerases,whicharewithmolecularmassesofapproximately30-70kDa.TheEASisstableatawiderangeofpHvalues(6.0-11.0),temperatures(0-50℃),andsodiumchloride(NaCl)concentrations(0-0.9molL-1).TwomajordegradationproductsgeneratedfromagarosebytheEASareidentifiedtobeneoagarotetraoseandneoagarohexaose,suggestingthatβ-agarasesarethemajorconstituentsoftheMY04EAS.TheseresultssuggestthattheFlammeovirgastrainMY04anditspolysac-charide-degradationsystemholdgreatpromiseinindustrialapplications.

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A Polysaccharide-Degrading Marine Bacterium Flammeovirga sp.MY04 and Its Extracellular Agarase System

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A Polysaccharide-Degrading Marine Bacterium Flammeovirga sp.MY04 and Its Extracellular Agarase System

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