The genome sequence of the capnophilic rumen bacterium Mannheimia succiniciproducens

Nat Biotechnol. 2004 Oct;22(10):1275-81. doi: 10.1038/nbt1010. Epub 2004 Sep 19.


The rumen represents the first section of a ruminant animal's stomach, where feed is collected and mixed with microorganisms for initial digestion. The major gas produced in the rumen is CO(2) (65.5 mol%), yet the metabolic characteristics of capnophilic (CO(2)-loving) microorganisms are not well understood. Here we report the 2,314,078 base pair genome sequence of Mannheimia succiniciproducens MBEL55E, a recently isolated capnophilic Gram-negative bacterium from bovine rumen, and analyze its genome contents and metabolic characteristics. The metabolism of M. succiniciproducens was found to be well adapted to the oxygen-free rumen by using fumarate as a major electron acceptor. Genome-scale metabolic flux analysis indicated that CO(2) is important for the carboxylation of phosphoenolpyruvate to oxaloacetate, which is converted to succinic acid by the reductive tricarboxylic acid cycle and menaquinone systems. This characteristic metabolism allows highly efficient production of succinic acid, an important four-carbon industrial chemical.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Bacterial Proteins / genetics
  • Bacterial Proteins / metabolism
  • Base Sequence
  • Carbon Dioxide / metabolism*
  • Chromosome Mapping / methods*
  • Gene Expression Regulation, Bacterial / physiology*
  • Genome, Bacterial
  • Mannheimia / genetics*
  • Mannheimia / metabolism*
  • Models, Biological*
  • Molecular Sequence Data
  • Proteome / genetics
  • Proteome / metabolism*
  • Rumen / microbiology
  • Succinic Acid / metabolism


  • Bacterial Proteins
  • Proteome
  • Carbon Dioxide
  • Succinic Acid

Associated data

  • GENBANK/AE016827