title: Identification of a major protein upon phosphate starvation of Pseudomonas aeruginosa PAO1.
abstract: To understand the physiology of non-differentiating bacteria exposed to nutrient deprivation and stress, various approaches have been employed in combination with detailed analysis of protein synthesis pattern. In this study, separation of proteins from clarified cell extracts of Pseudomonas aeruginosa PAO1 grown under phosphorus limiting conditions was achieved by high resolution two-dimensional gel electrophoresis (2-DE). Limitation of phosphate in the growth medium revealed significant differences in the 2-DE pattern of proteins between phosphate starved cells and an unstarved control. A major protein identified as PstS, a phosphate binding protein of the pts operon was exclusively found on 2-DE gels of phosphate starved bacteria. The identity of protein was established based on the results of Edman degradation, amino acid analysis and mass spectrometry. PstS was also found in other pseudomonads, and therefore, it can be used as a landmark protein in proteomic studies. Additionally, we propose utilizing pstS of pseudomonads for testing bioavailable phosphate from soils and water streams.
authors.affiliation: Center for Veterinary Biologics, Animal and Plant Health Inspection Services, USDA, 1800 Dayton Avenue, Ames, Iowa 50010, USA. kunapuli.t.madhusudhan@aphis.usda.gov
authors.forename: Kunapuli T
authors.initials: KT
authors.lastname: Madhusudhan
authors.forename: Robert
authors.initials: R
authors.lastname: McLaughlin
authors.forename: Naoka
authors.initials: N
authors.lastname: Komori
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Matsumoto
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000032:analysis / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods; D026901:Membrane Transport Proteins / Q000235:genetics; D008969:Molecular Sequence Data; D028044:Phosphate-Binding Proteins / Q000302:isolation & purification; D010710:Phosphates / Q000172:deficiency / Q000378:metabolism; D011550:Pseudomonas aeruginosa / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D017385:Sequence Homology
chemical_list: D001426:Bacterial Proteins; D026901:Membrane Transport Proteins; D028044:Phosphate-Binding Proteins; D010710:Phosphates; C090617:SphX protein, Synechococcus sp.