Proteome reference map and comparative proteomic analysis between a wild type clostridium acetobutylicumDSM 1731 and its mutant with enhanced butanol tolerance and butanol yield

Shaoming Mao, Yuanming Luo, Tianrui Zhang, Jinshan Li, Guanhui Bao, Yan Zhu, Zugen Chen, Yanping Zhang, Yin Li, Yanhe Ma

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The solventogenic bacterium Clostridium acetobutylicum is an important species of the Clostridium community. To develop a fundamental tool that is useful for biological studies of C. acetobutylicum, we established a high resolution proteome reference map for this species. We identified 1206 spots representing 564 different proteins by mass spectrometry, covering approximately 50% of major metabolic pathways. To better understand the relationship between butanol tolerance and butanol yield, we performed a comparative proteomic analysis between the wild type strain DSM 1731 and the mutant Rh8, which has higher butanol tolerance and higher butanol yield. Comparative proteomic analysis of two strains at acidogenic and solventogenic phases revealed 102 differentially expressed proteins that are mainly involved in protein folding, solvent formation, amino acid metabolism, protein synthesis, nucleotide metabolism, transport, and others. Hierarchical clustering analysis revealed that over 70% of the 102 differentially expressed proteins in mutant Rh8 were either upregulated (e.g., chaperones and solvent formation related) or downregulated (e.g., amino acid metabolism and protein synthesis related) in both acidogenic and solventogenic phase, which, respectively, are only upregulated or downregulated in solventogenic phase in the wild type strain. This suggests that Rh8 cells have evolved a mechanism to prepare themselves for butanol challenge before butanol is produced, leading to an increased butanol yield. This is the first report on the comparative proteome analysis of a mutant strain and a base strain of C. acetobutylicum. The fundamental proteomic data and analyses will be useful for further elucidating the biological mechanism of butanol tolerance and/or enhanced butanol production.

Original languageEnglish
Pages (from-to)3046-3061
Number of pages16
JournalJournal of Proteome Research
Issue number6
Publication statusPublished - 4 Jun 2010
Externally publishedYes


  • acidogenesis
  • butanol tolerance
  • butanol yield
  • Clostridium acetobutylicum
  • comparative proteome analysis
  • proteome reference map
  • solventogenesis
  • two-dimensional gel electrophoresis

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