Analysis of the elements of catabolite repression in Clostridium acetobutylicum ATCC 824

Martin Tangney, Anne Galinier, Josef Deutscher, Wilfrid J. Mitchell

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The ptsH gene, encoding the phosphotransferase protein HPr, from Clostridium acetobutylicum ATCC 824 was identified from the genome sequence, cloned and shown to complement a ptsH mutant of Escherichia coli. The deduced protein sequence shares significant homology with HPr proteins from other low-GC gram-positive bacteria, although the highly conserved sequence surrounding the Ser-46 phosphorylation site is not well preserved in the clostridial protein. Nevertheless, the HPr was phosphorylated in an ATP-dependent manner in cell-free extracts of C. acetobutylicum. Furthermore, purified His-tagged HPr from Bacillus subtilis was also a substrate for the clostridial HPr kinase/phosphorylase. This phosphorylation reaction is a key step in the mechanism of carbon catabolite repression proposed to operate in B. subtilisand other low-GC gram-positive bacteria. Putative genes encoding the HPr kinase/phosphorylase and the other element of this model, namely the catabolite control protein CcpA, were identified from the C. acetobutylicum genome sequence, suggesting that a similar mechanism of carbon catabolite repression may operate in this industrially important organism. Copyright © 2003 S. Karger AG, Basel.

Original languageEnglish
Pages (from-to)6-11
Number of pages6
JournalJournal of Molecular Microbiology and Biotechnology
Volume6
Issue number1
DOIs
Publication statusPublished - 2003

Keywords

  • CcpA
  • HPr
  • Phosphotransferase system
  • Protein kinase

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