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Nickel is an essential nutrient for selected microorganisms where it participates in a variety of cellular processes. Many microbes are capable of sensing cellular nickel ion concentrations and taking up this nutrient via nickel-specific permeases or ATP-binding cassette-type transport systems. The metal ion is specifically incorporated into nickel-dependent enzymes, often via complex assembly processes...
Hydrogenases are proteins which metabolize the most simple of chemical compounds, molecular hydrogen, according to the reaction H 2 2H + + 2e - . These enzymes are found in many microorganisms of great biotechnological interest such as methanogenic, acetogenic, nitrogen fixing, photosynthetic or sulfate-reducing bacteria. The X-ray structure of a dimeric [NiFe] hydrogenase...
A region of DNA 6kb downstream of the hydrogenase (H 2 ase) structural genes and directly downstream of the hypB gene of Bradyrhizobium japonicum was shown by mutational analysis to be necessary for H 2 ase synthesis. Sequencing of this region revealed two complete open reading frames, and the 5 fragment of a third ORF. They encode proteins with homologies to the HypF, HypC and the...
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