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  • Title: Mapping and identification of Brucella melitensis proteins by two-dimensional electrophoresis and microsequencing.
    Author: Teixeira-Gomes AP, Cloeckaert A, Bézard G, Dubray G, Zygmunt MS.
    Journal: Electrophoresis; 1997 Jan; 18(1):156-62. PubMed ID: 9059838.
    Abstract:
    Two-dimensional (2-D) gel electrophoresis was used to map Brucella melitensis proteins. The 2-D proteins map of B. melitensis B115 revealed 595 silver-stained protein spots separated by both isoelectric point and molecular mass. Twenty-five proteins were identified either by immunoblotting using monoclonal antibodies (MAbs) or by N-terminal microsequencing. The protein spots identified by MAbs were the 89 kDa outer membrane protein, DnaK, bacterioferritin, CP24, and BP26. Some spots were identified by N-terminal microsequencing as proteins whose sequences had been reported previously from Brucella, such as three heat-shock proteins, namely DnaK, GroEL and GroES; bacterioferritin; Cu-Zn superoxide dismutase; and the 50S ribosomal protein L7/L12. Other proteins had amino acid sequences homologous with those of various proteins from other bacteria found in protein databases: ClpP; the 10K-S protein; the ORFU phosphoprotein; succinyl-CoA synthetase alpha sub-unit; an inorganic pyrophosphatase; the Fe and/or Mn superoxide dismutase; the nucleoside diphosphate kinase, an amino acid ABC type transporter, and an electron transfer flavoprotein small subunit. Seven proteins were identified with N-terminal sequences not yet reported in databases. The 2-D map established in this study will be the basis for comparative studies of protein expression in Brucella.
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