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. 1991 Mar;173(6):1839–1844. doi: 10.1128/jb.173.6.1839-1844.1991

Purification and characterization of the hydrogen uptake hydrogenase from the hyperthermophilic archaebacterium Pyrodictium brockii.

T D Pihl 1, R J Maier 1
PMCID: PMC207711  PMID: 1900502

Abstract

Pyrodictium brockii is a hyperthermophilic archaebacterium with an optimal growth temperature of 105 degrees C. P. brockii is also a chemolithotroph, requiring H2 and CO2 for growth. We have purified the hydrogen uptake hydrogenase from membranes of P. brockii by reactive red affinity chromatography and sucrose gradient centrifugation. The molecular mass of the holoenzyme was 118,000 +/- 19,000 Da in sucrose gradients. The holoenzyme consisted of two subunits by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The large subunit had a molecular mass of 66,000 Da, and the small subunit had a molecular mass of 45,000 Da. Colorometric analysis of Fe and S content in reactive red-purified hydrogenase revealed 8.7 +/- 0.6 mol of Fe and 6.2 +/- 1.2 mol of S per mol of hydrogenase. Growth of cells in 63NiCl2 resulted in label incorporation into reactive red-purified hydrogenase. Growth of cells in 63NiCl2 resulted in label incorporation into reactive red-purified hydrogenase. Temperature stability studies indicated that the membrane-bound form of the enzyme was more stable than the solubilized purified form over a period of minutes with respect to temperature. However, the membranes were not able to protect the enzyme from thermal inactivation over a period of hours. The artificial electron acceptor specificity of the pure enzyme was similar to that of the membrane-bound form, but the purified enzyme was able to evolve H2 in the presence of reduced methyl viologen. The Km of membrane-bound hydrogenase for H2 was approximately 19 microM with methylene blue as the electron acceptor, whereas the purified enzyme had a higher Km value.

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Selected References

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