Abstract
Two polypeptides present in aerobic and anaerobic cultures of Escherichia coli HB101 were shown to cross-react with antibodies to the 30- and 60-kilodalton (kDa) subunits of the uptake hydrogenase of Rhizobium japonicum. The cross-reactive polypeptides in a series of different E. coli strains are of Mrs ca. 60,000 and 30,000, and both polypeptides are present in proportion to measurable hydrogen uptake (Hup) activity (r = 0.95). The 60-kDa polypeptide from E. coli HB101 comigrated on native gels with detectable Hup activity. The exact role of the 30-kDa polypeptide in E. coli is unclear. E. coli MBM7061, a natural Hup- variant, grown anaerobically or aerobically lacked detectable Hup activity and failed to cross-react with the antisera against the hydrogenase from R. japonicum. Anaerobically cultured E. coli MBM7061, however, did express formate hydrogenlyase activity, indicating that the hydrogenases involved in the oxygen-dependent activation of hydrogen and the formate-dependent evolution of hydrogen are biochemically distinct.
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Selected References
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