Identification of nolR-regulated proteins in Sinorhizobium meliloti using proteome analysis.
Date
2000
Authors
Chen, Hancai
Higgins, Jody
Kondorosi, Eva
Kondorosi, Adam
Djordjevic, Michael
Weinman, Jeremy
Rolfe, Barry
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Wiley-VCH Verlag GMBH
Abstract
Extractable proteins from Sinorhizobium meliloti strains AK631 and EK698 (a Tn5-induced noIR-deficient mutant of AK631), grown in tryptone agar (TA) medium with or without the addition of the plant signal luteolin, were separated by two-dimensional gel electrophoresis and compared. Analysis of silver-stained gels showed that the noIR mutant had 189 proteins that were significantly altered in their levels (101 protein spots up- and 88 downregulated). Coomassie-stained preparative two-dimensional (2-D) gels or polyvinylidene difluoride (PVDF) membranes blotted from preparative gels showed that at least 52 of the altered proteins could be reproducibly detected and isolated from the noIR mutant. These 52 altered protein spots were classified into five groups based on an assessment of protein abundance by computer analysis and the effect of the presence or absence of luteolin addition to the growth medium. N-terminal microsequencing of 38 proteins revealed that the most striking feature of the consequence of the noIR mutation is the number and broad spectrum of cellular functions that are affected by the loss of the NoIR function. These include proteins involved in the tricarboxylic acid (TCA) cycle, heat shock and cold shock proteins, protein synthesis, a translation elongation factor, oxidative stress and cell growth and maintenance functions. We propose that the NoIR repressor is a global regulatory protein which responds to environmental factors to fine-tune intracellular metabolism.
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Keywords: bacterial protein; cold shock protein; heat shock protein; polyvinylidene fluoride; protein noir; proteome; regulator protein; repressor protein; unclassified drug; amino acid sequence; article; bacterial gene; cell growth; cell metabolism; citric acid cy Functional genomics; Gene regulation; Intracellular regulation; Proteomics; Two-dimensional gel electrophoresis
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Source
Electrophoresis
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Journal article
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2037-12-31
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