The first model of the iron hydrogenase active site has been prepared in which an amine ligand is loosely coordinated to an Fe(i) centre, and can be replaced by a solvent molecule; irrespective of the ligand set, the one electron reduction of both complexes is chemically reversible and is shown to proceed through the same species which features a bridging CO ligand.

The cytoplasmic, NAD-reducing hydrogenase (SH) of Alcaligenes eutrophus H16 is a heterotetrameric enzyme which contains several cofactors and undergoes a complex maturation during biogenesis. HoxH is the Ni-carrying subunit, and together with HoxY it forms the hydrogenase dimer. HoxF and HoxU represent the flavin-containing diaphorase moiety, which is closely related to NADH:ubiquinone oxidored...

[NiFe]-hydrogenases are regulated by various factors to fulfill their physiological functions in bacterial cells. The photosynthetic purple sulfur bacterium Thiocapsa roseopersicina harbors four functional [NiFe]-hydrogenases: HynSL, HupSL, Hox1, and Hox2. Most of these hydrogenases are functionally linked to sulfur metabolism, and thiosulfate has a central role in this organism. The membrane-a...

Among cyanobacteria, the heterocystous, N2-fixing Anabaena variabilis and the unicellular Anacystis nidulans have recently been shown to possess an NAD+-dependent, bidirectional hydrogenase. A 5.0 kb DNA segment of the `4. nidulans genome is now identified to harbor the structural genes hoxUYH coding for three subunits of the bidirectional hydrogenase. The gene arrangement in A. nidulans and in...

aloe vera is a medicinal plant as antioxidants reduce cell damage and used. the purpose of this study was to determine the effect of aloe vera on lactate de-hydrogenase after a period of aerobic exercise in male athletes.methods this study applied the method according to the nature of the study, based on semi-empirical research and a review of the pre-test, post-test supplements and placebo gro...