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. 1986 Nov;168(2):636–641. doi: 10.1128/jb.168.2.636-641.1986

Molecular cloning of structural and regulatory hydrogenase (hox) genes of Alcaligenes eutrophus H16.

G Eberz, C Hogrefe, C Kortlüke, A Kamienski, B Friedrich
PMCID: PMC213528  PMID: 3536856

Abstract

A gene bank of the 450-kilobase (kb) megaplasmid pHG1 from the hydrogen-oxidizing bacterium Alcaligenes eutrophus H16 was constructed in the broad-host-range mobilizable vector pSUP202 and maintained in Escherichia coli. hox DNA was identified by screening the E. coli gene bank for restoration of hydrogenase activity in A. eutrophus Hox mutants. Hybrid plasmids that contained an 11.6-kb EcoRI fragment restored soluble NAD-dependent hydrogenase activity when transferred by conjugation into one class of Hos- mutants. An insertion mutant impaired in particulate hydrogenase was partially restored in Hop activity by an 11-kb EcoRI fragment. A contiguous sequence of two EcoRI fragments of 8.6 and 2.0 kb generated Hox+ recombinants from mutants that were devoid of both hydrogenase proteins. hox DNA was subcloned into the vector pVK101. The resulting recombinant plasmids were used in complementation studies. The results indicate that we have cloned parts of the structural genes coding for Hos and Hop activity and a complete regulatory hox DNA sequence which encodes the thermosensitive, energy-dependent derepression signal of hydrogenase synthesis in A. eutrophus H16.

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Selected References

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