pH-dependent redox and CO binding properties of chelated protoheme-l-histidine and protoheme-glycyl-l-histidine complexes
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Oxidorhenium(V) complexes with L-histidine and pyranosides.
The reaction of the oxidorhenium(V) precursor [ReOCl(3)(PPh(3))(2)] with the proteinogenic amino acid L-histidine (L-hisH) and the glycosides methyl alpha-D-mannopyranoside (Me-alpha-D-Manp) and methyl beta-D-ribopyranoside (Me-beta-D-Ribp) in methanol/triethylamine yielded the crystalline compounds [ReO(L-his)(Me-alpha-D-Manp2,3H(-2))] x 2MeOH (1) and [ReO(L-his)(Me-beta-D-Ribp3,4H(-2))] x (1/...
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The title compound, C(6)H(8)FN(3)O(2), an analog of histidine, shows a reduced side-chain pK(a) (ca 1). The title structure exhibits a shortening of the bond between the proximal ring N atom and the F-substituted ring C atom, indicating an increase in π-bond character due to an inductive effect of fluorine.
متن کاملTetrahedral complexes of cobalt(II) with L-histidine, histamine, imidazole, and N-acetyl-L-hystidine.
In highly alkaline aqueous solutions, cobalt(I1) forms violet, tetrahedral, bis complexes with L-histidine, histamine, and N-acetyl-L-histidine. Imidazole similarly forms a tetrakis complex. Generation of the tetrahedral complexes is dependent on deprotonation of the imidazole ring pyrrole nitrogen for the L-histidine, histamine, and imidazole complexes, and on two amide hydrogen ionizations fo...
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The major pathway of histidine metabolism in animals and bacteria other than incorporation into protein involves first deamination to urocanic acid, then the anaerobic addition of water to form an intermediate generally considered to be 4(5)imidazolone-5(4)-propionic acid (1, 2). Finally, the ring is split enzymatically to ~formiminoglutamic acid (3) which is converted to free cglutamic acid by...
متن کاملCadmium-induced crystallization of proteins: II. Crystallization of the Salmonella typhimurium histidine-binding protein in complex with L-histidine, L-arginine, or L-lysine.
To further investigate favorable effects of divalent cations on the formation of protein crystals, three complexes of Salmonella typhimurium histidine-binding protein were crystallized with varying concentrations of cadmium salts. For each of the three histidine-binding protein complexes, cadmium cations were found to promote or improve crystallization. The optimal cadmium concentration is liga...
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ژورنال
عنوان ژورنال: JBIC Journal of Biological Inorganic Chemistry
سال: 2005
ISSN: 0949-8257,1432-1327
DOI: 10.1007/s00775-005-0060-y