Abstract
Megaplasmid DNA from mutants has been analysed physically for deletions and insertions in order to identify the location of hydrogenase (hox) genes in Alcaligenes eutrophus. Four classes of mutants have been examined: mutants defective in genes coding for soluble NAD-dependent hydrogenase (hoxS), mutants impaired in the membrane-bound hydrogenase (hoxP), mutants altered in the regulation of hox gene expression (hoxC) and mutants with lesions in the carbon dioxide fixing enzyme system (cfx). A comparison of the restriction patterns with EcoRI, BamHI and HindIII, complementation studies with cloned DNA and DNA - DNA hybridization experiments showed that genes coding for hox and cfx are clustered on a 100-kb region of the 450-kb plasmid pHG1.
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