Identification of the membrane protein SucE and its role in succinate transport in Corynebacterium glutamicum

Appl Microbiol Biotechnol. 2011 Jan;89(2):327-35. doi: 10.1007/s00253-010-2855-1. Epub 2010 Aug 31.

Abstract

Succinic acid is excreted during anaerobiosis by many bacteria, and manifold applications are known making the biotechnological production of succinate attractive. Although the pathways for succinate formation are known, succinate export is not understood in most of the succinate producing bacteria. Here, we present a bioinformatic approach for identification of a putative succinate export system in Corynebacterium glutamicum. The subsequent screening revealed that a mutant in the gene cg2425 is impaired in succinate production or transport under anaerobic conditions. A function of the Cg2425 protein as import system was excluded. In contrast, a role of the Cg2425 protein as succinate export system was indicated by accumulation of increased amounts of internal succinate under anaerobic conditions in a Cg2425-dependent manner and a concomitant impairment of external succinate accumulation. In conclusion, we propose that Cg2425 participates in succinate export in C. glutamicum and suggest the name SucE for the protein.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Proteins / genetics
  • Bacterial Proteins / metabolism*
  • Biological Transport
  • Corynebacterium glutamicum / classification
  • Corynebacterium glutamicum / genetics
  • Corynebacterium glutamicum / metabolism*
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism*
  • Molecular Sequence Data
  • Phylogeny
  • Succinic Acid / metabolism*

Substances

  • Bacterial Proteins
  • Membrane Proteins
  • Succinic Acid