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. 1981 Aug 1;197(2):283–291. doi: 10.1042/bj1970283

The organization of hydrogenase in the cytoplasmic membrane of Escherichia coli.

A Graham
PMCID: PMC1163125  PMID: 7034717

Abstract

The organization of the membrane-bound hydrogenase from Escherichia coli was studied by using two membrane-impermeant probes, diazotized [125I]di-iodosulphanilic acid and lactoperoxidase-catalysed radioiodination. The labelling pattern of the enzyme obtained from labelled spheroplasts was compared with that from predominantly inside-out membrane vesicles, after recovery of hydrogenase by immunoprecipitation. The labelling pattern of F1-ATPase was used as a control for labelling at the cytoplasmic surface throughout these experiments. Hydrogenase (mol.wt. approx. 63 000) is transmembranous. Crossed immunoelectrophoresis with anti-(membrane vesicle) immunoglobulins, coupled with successive immunoadsorption of the antiserum with spheroplasts, confirmed the location of hydrogenase at the periplasmic surface. Immunoadsorption with sonicated spheroplasts suggests that the enzyme is also exposed at the cytoplasmic surface. Inside-out vesicles were prepared by agglutination of sonicated spheroplasts, and the results of immunoadsorption using these vesicles confirms the location of hydrogenase at the cytoplasmic surface.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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