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. 1987 May;169(5):2079–2085. doi: 10.1128/jb.169.5.2079-2085.1987

Purification and properties of a protein linked to the soluble hydrogenase of hydrogen-oxidizing bacteria.

U Kärst, S Suetin, C G Friedrich
PMCID: PMC212095  PMID: 3553156

Abstract

In Alcaligenes eutrophus, the formation of the hydrogenases and of five new peptides is subject to the hydrogenase control system. Of these, the B peptide was purified to homogeneity. This protein (Mr, 37,500) was composed of two identical subunits (Mr, 18,800). Antibodies against the B protein were used for its quantification by rocket immunoelectrophoresis. About 4% of the total protein consisted of the B protein; its molar ratio to the NAD-linked hydrogenase was about 4:1. The B protein appeared to be associated with the NAD-linked hydrogenase, as shown by gel filtration analysis with Sephadex G-200. The B protein was not detected in cells that had not expressed the hydrogenase proteins or that lacked the genetic information of the hydrogen-oxidizing character; it was also not detected in Tn5 insertional mutants that were unable to form soluble hydrogenase antigens. Immunochemical analysis of other species and genera than A. eutrophus revealed that only strains able to form a NAD-linked hydrogenase also formed B-protein antigens. The B protein is not required for the catalytic activity of soluble hydrogenase in vitro; its function is at present unknown.

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Selected References

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