Sulfur metabolism

Magnesium (Mg)-deficiency is one of the most prevalent physiological disorders causing a reduction in Citrus yield and quality. ‘Xuegan’ (Citrus sinensis) seedlings were irrigated for 16 weeks with nutrient solution containing 2 mM (Mg-sufficiency) or 0 mM (Mg-deficiency) Mg(NO3)2.

20p vishikamaru2711 29-04-2020 21 1   Download

Heterodisulfide reductase (Hdr) is a unique disulfide reduc-tase that plays a key role in the energy metabolism of methanogenic archaea. Two types of Hdr have been identi-fied and characterized from distantly related methanogens. Here we show that the sulfate-reducing archaeonArchaeo-globus profunduscultivated on H2/sulfate forms enzymes related toboth typesofHdr.Fromthemembrane fractionof A. profundus, a two-subunit enzyme (HmeCD) composedof ab-type cytochrome and a hydrophilic iron–sulfur protein was isolated. ...

11p dell39 03-04-2013 33 3   Download

Biological nitrogen fixation is a vital process in the global nitrogen cycle, transforming dinitrogen in the atmosphere into ammonia. Being a very energy-demanding and oxygen-sensitive process, both expression and activity of the nitrogenase enzyme are tightly regu-lated. Rhodospirillum rubrumis a free-living, photosynthetic, purple non-sulfur nitrogen-fixing bacterium, which has been extensively used as a model organism for metabolic and regulatory studies regarding nitrogen fixation.

24p galaxyss3 19-03-2013 61 4   Download

Amongst a wide variety of different biochemical reactions in cellular car-bon metabolism, thiamin diphosphate-dependent enzymes catalyze the oxi-dative decarboxylation of 2-keto acids. This type of reaction typically involves redox coupled acyl transfer to CoA or phosphate and is mediated by additional cofactors, such as flavins, iron-sulfur clusters or lipoamide swinging arms, which transmit the reducing equivalents that arise during keto acid oxidation to a final electron acceptor.

15p viettel02 22-02-2013 48 4   Download