The biosynthesis of kitasamycin in Streptomyces kitasatoensis B-896 was profoundly influenced by the addition of precursors to complex and defined media: l-valine and l-leucine directed biosynthesis towards the pairs A(4)/A(5) (R(2) = butyryl) and A(1)/A(3) (R(2) = isovaleryl), respectively, and total kitasamycin titers were doubled and quadrupled, respectively. S. kitasatoensis B-896 was very ...

Abstract The stability constants of some the binary and ternary system involving Nickel(II) have been studied. Bis-(pyridyl) benzilidene acts as a primary ligand. Glycine, L-alanine, L-phenylalanine, L-leucine L-valine were secondary complex are calculated by SCOGS computer program. reported values ± 0.02 log unit accuracy. protonation increase with an increasing percentage dimethyl sulphoxide....

The Escherichia coli K-12 mutant strain AE4107 (livH::Mu) is defective in the high-affinity binding protein-mediated uptake system for L-leucine, L-valine, and L-isoleucine (LIV-I). We have used this strain to produce mutations in the residual LIV-II membrane-bound branched-chain amino acid uptake system. Mutants selected for their inability to utilize exogenous L-leucine were found to be defec...

Growing and nongrowing cells of Clostridium sporogenes fermented betaine with l-alanine, l-valine, l-leucine, and l-isoleucine as electron donors in a coupled oxidation-reduction reaction (Stickland reaction). For the substrate combinations betaine and l-alanine and betaine and l-valine balance studies were performed; the results were in agreement with the following fermentation equation: 1 R- ...

6556 Background: Polymorphisms in FcγRIIIA (CD16) receptor expression modulate human IgG1 binding, and antibody dependent cell mediated cytotoxicity, and may therefore impact responses to rituximab in patients with WM. METHODS We therefore performed sequencing of all DNA coding regions for FcγRIIIA in 58 patients with Waldenstrom's macroglobulinemia (WM) treated with rituximab. Two distinct, ...

The steps in the pathway of formation of valine are: decarbosylation of pyruvate to an acetaldehyde-thiamine pyrophosphate intermediate which condenses with another molecule of pyruvate to yield ar-acetolactic acid, migration of the a-methyl carbon to form ar-keto-fl-hydroxyisovaleric acid, reduction of this acid to produce (Y ,&dihydroxyisovaleric acid, dehydration to yield ar-ketoisovaleric a...

These studies have examined whether skeletal muscle during fasting uses amino acids derived from muscle protein breakdown as an energy source or as precursors in the synthesis of glutamine and alanine. Diaphragms from fasting rats were incubated in vitro to study the fates of aspartate, asparagine, glutamate, isoleucine, and valine, the only amino acids that can be converted to tricarboxylic ac...

The data obtained in these experiments show that the nitrile nitrogen of dhurrin is directly derived from the a-amino group of L-tyrosine. This is analogous to the retention of the a-amino nitrogen of valine on its conversion to linamarin (6). The biosynthetic route from L-tyrosine to dhurrin must involve the modification of the amino acid in a manner such that the C&z-N unit remains intact. 15...