Background Reading: Chemistry: Oxidation states of Sulfur Biochemistry: Sulfur containing biomolecules Physiology: Midpoint Potentials and Respirations
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چکیده
Why is it that different organisms do so many different things with sulfur? Sulfur exists in many different oxidation states Reduced sulfur is required for many biomolecules Sulfur forms can serve as an electron sources or as electron acceptors Oxidation states of sulfur Sulfur assimilation in bacteria and yeasts Sulfur-containing biomolecules Sulfide Oxidation Sulfate Reduction Sulfur Oxidation and Reduction Chemolithotrophy and Sulfide Oxidation
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New proteins involved in sulfur trafficking in the cytoplasm of Allochromatium vinosum.
The formation of periplasmic sulfur globules is an intermediate step during the oxidation of reduced sulfur compounds in various sulfur-oxidizing microorganisms. The mechanism of how this sulfur is activated and crosses the cytoplasmic membrane for further oxidation to sulfite by the dissimilatory reductase DsrAB is incompletely understood, but it has been well documented that the pathway invol...
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The crystal structure of the bovine Rieske iron-sulfur protein indicates a sulfur atom (S-1) of the iron-sulfur cluster and the sulfur atom (Sgamma) of a cysteine residue that coordinates one of the iron atoms form hydrogen bonds with the hydroxyl groups of Ser-163 and Tyr-165, respectively. We have altered the equivalent Ser-183 and Tyr-185 in the Saccharomyces cerevisiae Rieske iron-sulfur pr...
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Background: We intend to study the inhibitory effect of sulfur compound in Ramsar hot spring mineral on tumor-genesis ability of high natural background radiation. Objective: The radioprotective effect of sulfur compounds was previously shown on radiation-induced chromosomal aberration, micronuclei in mouse bone marrow cells and human peripheral lymphocyte. Ramsar is known for having the highe...
متن کاملX-Ray Absorption Near Edge Spectroscopy of Sulfur in Biomolecules: Two Examples from Glutathione and Insulin
Although a minor constituent of cell and tissues, sulfur is an essential element to fulfil a wide range of biological processes, and it is present in the functional groups of many biomolecules that participate to redox reactions in vivo. Cysteine, one of the two S-containing aminoacids present in proteins, contains sulfur in fully reduced form and its thiol group can undergo a range of reaction...
متن کاملSuperoxide anion generation by the cytochrome bc1 complex.
We have measured the rates of superoxide anion generation by cytochrome bc(1) complexes isolated from bovine heart and yeast mitochondria and by cytochrome bc(1) complexes from yeast mutants in which the midpoint potentials of the cytochrome b hemes and the Rieske iron-sulfur cluster were altered by mutations in those proteins. With all of the bc(1) complexes the rate of superoxide anion produc...
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