Abstract
Cellulomonas sp. strain ATCC 21399 is a facultatively anaerobic, cellulose-degrading microorganism that does not evolve hydrogen but produces organic acids during cellulose fermentation. Rhodopseudomonas capsulata cannot utilize cellulose, but grows photoheterotrophically under anaerobic conditions on organic acids or sugars. This report describes an anaerobic coculture of the Cellulomonas strain with wild-type R. capsulata or a mutant strain lacking uptake hydrogenase, which photoevolves molecular hydrogen by the nitrogenase system of R. capsulata with cellulose as the sole carbon source. In coculture, the hydrogenase-negative mutant produced 4.6 to 6.2 mol of H2 per mol of glucose equivalent, compared with 1.2 to 4.3 mol for the wild type.
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