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Science 16 April 1982:
Vol. 216. no. 4543, pp. 303 - 305
DOI: 10.1126/science.7063887
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Articles

Science, Vol 216, Issue 4543, 303-305
Copyright © 1982 by American Association for the Advancement of Science

articles

Role of vitamin B12 in methyl transfer for methane biosynthesis by Methanosarcina barkeri

JM Wood, I Moura, JJ Moura, MH Santos, AV Xavier, J LeGall, and M Scandellari

When Methanosarcina barkeri is grown on methanol as the sole carbon source, a B12-containing protein is synthesized by this organism. This B12 protein contains bound aquocobalamin, and when this cofactor is reduced and methylated with [14C]methyl iodide, the resultant [14C]methyl B12 protein is extremely active in the biosynthesis of 14C-labeled methane. These findings indicate that a B12-dependent system is operative in the biological formation of methane in addition to other systems that are B12-independent.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)