title: Sterol and steroid catabolites from cholesterol produced by the psychrophile Pseudoalteromonas haloplanktis.
abstract: Pseudoalteromonas haloplanktis, a psychrotrophilic marine bacterium of biotechnological interest, shows anti-biofilm properties and is particularly relevant for cold storage of vacuum packed seafood. We focused our interest on the activation of cholesterol metabolism in this bacterium as the presence in its genome of a putative 3-ketosteroid-Δ(1) -dehydrogenase. This study reports GC-MS and LC-MS/MS profiles of sterols/steroids and their derivatives found in cell extracts of P. haloplanktis grown in a medium with a low content of cholesterol. Here, for the first time, we suggest that P. haloplanktis produces some intermediates of cholesterol catabolism, putatively identified as 24-hydroxycholest-1,4-dien-3-one-26-oic acid, chol-1,4-dien-3-one-24-oic acid, 26-hydroxycholest-4-en-3-one, and pregn-4-en-3-one-20-carboxylic acid, a finding already reported in other microorganisms. The presence of these compounds, also considered steroid precursors, produced by P. haloplanktis in vacuum packed seafood could be of interest for healthy of consumers, as well as, for biotechnological applications in pharmaceutical industry.
authors.affiliation: Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università di Napoli Federico II, 80131, Napoli, Italy.
authors.forename: Monica
authors.initials: M
authors.lastname: Gelzo
authors.forename: Anna
authors.initials: A
authors.lastname: Lamberti
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Spano
authors.forename: Antonio
authors.initials: A
authors.lastname: Dello Russo
authors.forename: Gaetano
authors.initials: G
authors.lastname: Corso
authors.forename: Mariorosario
authors.initials: M
authors.lastname: Masullo
mesh_terms: D002784:Cholesterol / Q000737:chemistry / Q000378:metabolism*; D002853:Chromatography, Liquid / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D031161:Pseudoalteromonas / Q000378:metabolism*; D013256:Steroids / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D013261:Sterols / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D013256:Steroids; D013261:Sterols; D002784:Cholesterol
keywords: GC-MS; LC-MS/MS; Pseudoalteromonas haloplanktis; cholesterol catabolism; steroids