Journal
ARCHIVES OF MICROBIOLOGY
Volume 184, Issue 5, Pages 279-285Publisher
SPRINGER
DOI: 10.1007/s00203-005-0040-1
Keywords
hydrogenase; phototrophic bacteria; metal ions reduction; metal oxidation; metals transformation by hydrogenases
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The ability of hydrogenases isolated from Thiocapsa roseopersicina and Lamprobacter modestohalophilus to reduce metal ions and oxidize metals has been studied. Hydrogenases from both phototrophic bacteria oxidized metallic Fe, Cd, Zn and Ni into their ionic forms with simultaneous evolution of molecular hydrogen. The metal oxidation rate decreased in the series Zn > Fe > Cd > Ni and depended on the pH. The presence of methyl viologen in the reaction system accelerated this process. T. roseopersicina and L. modestohalophilus cells and their hydrogenases reduced Ni(II), Pt(IV), Pd(II) or Ru(III) to their metallic forms under H-2 atmosphere. These results suggest that metals or metal ions can serve as electron donors or acceptors for hydrogenases from phototrophic bacteria.
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