title: Proteomic based investigation of rhamnolipid production by Pseudomonas chlororaphis strain NRRL B-30761.
abstract: We recently reported that a strain of the non-pathogenic bacterial species Pseudomonas chlororaphis was capable of producing the biosurfactant molecule, rhamnolipids. Previous to this report the organisms known to produce rhamnolipids were almost exclusively pathogens. The newly described P. chlororaphis strain produced rhamnolipids at room temperature in static minimal media, as opposed to previous reports of rhamnolipid production which occurred at elevated temperatures with mechanical agitation. The non-pathogenic nature and energy conserving production conditions make the P. chlororaphis strain an attractive candidate for commercial rhamnolipid production. However, little characterization of molecular/biochemical processes in P. chlororaphis have been reported. In order to achieve a greater understanding of the process by which P. chlororaphis produces rhamnolipids, a survey of proteins differentially expressed during rhamnolipid production was performed. Separation and measurement of the bacteria's proteome was achieved using Beckman Coulter's Proteome Lab PF2D packed column-based protein fractionation system. Statistical analysis of the data identified differentially expressed proteins and known orthologues of those proteins were identified using an AB 4700 Proteomics Analyzer mass spectrometer system. A list of proteins differentially expressed by P. chlororaphis strain NRRL B-30761 during rhamnolipid production was generated, and confirmed through a repetition of the entire separation process.
authors.affiliation: Agricultural Research Service, Eastern Regional Research Center, U.S. Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, PA 19038-8598, USA.
authors.forename: Nereus W
authors.initials: NW
authors.lastname: Gunther
authors.forename: Alberto
authors.initials: A
authors.lastname: Nuñez
authors.forename: Laurie
authors.initials: L
authors.lastname: Fortis
authors.forename: Daniel K Y
authors.initials: DK
authors.lastname: Solaiman
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D001709:Biotechnology / Q000379:methods; D003470:Culture Media; D015964:Gene Expression Regulation, Bacterial; D006017:Glycolipids / Q000096:biosynthesis* / Q000737:chemistry; D013058:Mass Spectrometry; D020543:Proteome; D040901:Proteomics; D011549:Pseudomonas / Q000254:growth & development / Q000378:metabolism*; D013501:Surface-Active Agents
chemical_list: D001426:Bacterial Proteins; D003470:Culture Media; D006017:Glycolipids; D020543:Proteome; D013501:Surface-Active Agents; C418382:rhamnolipid