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pubmed-article:16346878pubmed:abstractTextWe compared the metabolism of methanol and acetate when Methanosarcina barkeri was grown in the presence and absence of Desulfovibrio vulgaris. The sulfate reducer was not able to utilize methanol or acetate as the electron donor for energy metabolism in pure culture, but was able to grow in coculture. Pure cultures of M. barkeri produced up to 10 mumol of H(2) per liter in the culture headspace during growth on acetate or methanol. In coculture with D. vulgaris, the gaseous H(2) concentration was </=2 mumol/liter. The fractions of CO(2) produced from [C]methanol and 2-[C]acetate increased from 0.26 and 0.16, respectively, in pure culture to 0.59 and 0.33, respectively, in coculture. Under these conditions, approximately 42% of the available electron equivalents derived from methanol or acetate were transferred and were utilized by D. vulgaris to reduce approximately 33 mumol of sulfate per 100 mumol of substrate consumed. As a direct consequence, methane formation in cocultures was two-thirds that observed in pure cultures. The addition of 5.0 mM sodium molybdate or exogenous H(2) decreased the effects of D. vulgaris on the metabolism of M. barkeri. An analysis of growth and carbon and electron flow patterns demonstrated that sulfate-dependent interspecies H(2) transfer from M. barkeri to D. vulgaris resulted in less methane production, increased CO(2) formation, and sulfide formation from substrates not directly utilized by the sulfate reducer as electron donors for energy metabolism and growth.lld:pubmed
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pubmed-article:16346878pubmed:authorpubmed-author:ZeikusJ GJGlld:pubmed
pubmed-article:16346878pubmed:authorpubmed-author:ConradRRlld:pubmed
pubmed-article:16346878pubmed:authorpubmed-author:PhelpsT JTJlld:pubmed
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pubmed-article:16346878pubmed:pagination589-94lld:pubmed
pubmed-article:16346878pubmed:dateRevised2010-9-20lld:pubmed
pubmed-article:16346878pubmed:year1985lld:pubmed
pubmed-article:16346878pubmed:articleTitleSulfate-Dependent Interspecies H(2) Transfer between Methanosarcina barkeri and Desulfovibrio vulgaris during Coculture Metabolism of Acetate or Methanol.lld:pubmed
pubmed-article:16346878pubmed:affiliationDepartment of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin 53706, and Michigan Biotechnology Institute and Departments of Biochemistry and Microbiology, Michigan State University, East Lansing, Michigan 48824.lld:pubmed
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