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. 1984 Jul;75(3):705–709. doi: 10.1104/pp.75.3.705

Purification of Hydrogenase from Chlamydomonas reinhardtii1

Paul G Roessler 1,2, Stephen Lien 1,2
PMCID: PMC1066980  PMID: 16663691

Abstract

A method is described which results in a 2750-fold purification of hydrogenase from Chlamydomonas reinhardtii, yielding a preparation which is approximately 40% pure. With a saturating amount of ferredoxin as the electron mediator, the specific activity of pure enzyme was calculated to be 1800 micromoles H2 produced per milligram protein per minute. The molecular weight was determined to be 4.5 × 104 by gel filtration and 4.75 × 104 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The enzyme has an abundance of acidic side groups, contains iron, and has an activation energy of 55.1 kilojoules per mole for H2 production; these properties are similar to those of bacterial hydrogenases. The enzyme is less thermally stable than most bacterial hydrogenases, however, losing 50% of its activity in 1 hour at 55°C. The Km of purified hydrogenase for ferredoxin is 10 micromolar, and the binding of these proteins to each other is enhanced under slightly acidic conditions. Purified hydrogenase also accepts electrons from a variety of artificial electron mediators, including sodium metatungstate, sodium silicotungstate, and several viologen dyes. A lag period is frequently observed before maximal activity is expressed with these artificial electron mediators, although the addition of sodium thiosulfate at least partially overcomes this lag.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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