Abstract
A gene bank of a megaplasmid encoding the hydrogen-oxidizing enzyme system (Hox) in Alcaligenes hydrogenophilus was constructed using a broad host range cosmid vector pVK102, and established in Escherichia coli. Hybrid cosmids containing hox genes were identified by transferring the bank into Pseudomonas oxalaticus OX1 and screening colonies for the ability of H2-dependent autotrophic growth. About 800 colonies were formed under autotrophic conditions. One of the Hox+ transconjugants was isolated and its hydrogenases activities were measured. Although soluble hydrogenase was not detected, the Hox+ transconjugant had four times the membrane-bound hydrogenase activity of A. hydrogenophilus.
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