H2-independent growth of the hydrogenotrophic methanogen Methanococcus maripaludis.

ABSTRACT:

Unlabelled

Hydrogenotrophic methanogenic Archaea require reduced ferredoxin as an anaplerotic source of electrons for methanogenesis. H(2) oxidation by the hydrogenase Eha provides these electrons, consistent with an H(2) requirement for growth. Here we report the identification of alternative pathways of ferredoxin reduction in Methanococcus maripaludis that operate independently of Eha to stimulate methanogenesis. A suppressor mutation that increased expression of the glycolytic enzyme glyceraldehyde-3-phosphate:ferredoxin oxidoreductase resulted in a strain capable of H(2)-independent ferredoxin reduction and growth with formate as the sole electron donor. In this background, it was possible to eliminate all seven hydrogenases of M. maripaludis. Alternatively, carbon monoxide ox

SUBMITTER: Costa KC 

PROVIDER: S-EPMC3585446 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature