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Saccharomyces cerevisiae glycine biosynthesis from serine

Alanine:glyoxylate aminotransferase (EC 2.6.1.44), which is involved in the glyoxylate pathway of glycine and serine biosynthesis from tricarboxylic acid-cycle intermediates in Saccharomyces cerevisiae, was highly purified and characterized. The enzyme had M(r) about 80,000, with two identical subunits. It was highly specific for L-alanine and glyoxylate and contained pyridoxal 5'-phosphate as cofactor. The apparent K(m) values were 2.1mM and 0.7 mM for L-alanine and glyoxylate respectively. The activity was low (10 nmol/min per mg of protein) with glucose as sole carbon source, but was remarkably high with ethanol or acetate as carbon source (930 and 430 nmol/min per mg respectively). The transamination of glyoxylate is mainly catalysed by this enzyme in ethanol-grown cells. When glucose-grown cells were incubated in medium containing ethanol as sole carbon source, the activity markedly increased, and the increase was completely blocked by cycloheximide, suggesting that the enzyme is synthesized de novo during the incubation period. Similarity in the amino acid composition was observed, but immunological cross-reactivity was not observed among alanine:glyoxylate aminotransferases from yeast and vertebrate liver.

(2005), Biosynthesis of glyoxylate from glycine in Saccharomyces cerevisiae

AB - Alanine:glyoxylate aminotransferase (EC 2.6.1.44), which is involved in the glyoxylate pathway of glycine and serine biosynthesis from tricarboxylic acid-cycle intermediates in Saccharomyces cerevisiae, was highly purified and characterized. The enzyme had M(r) about 80,000, with two identical subunits. It was highly specific for L-alanine and glyoxylate and contained pyridoxal 5'-phosphate as cofactor. The apparent K(m) values were 2.1mM and 0.7 mM for L-alanine and glyoxylate respectively. The activity was low (10 nmol/min per mg of protein) with glucose as sole carbon source, but was remarkably high with ethanol or acetate as carbon source (930 and 430 nmol/min per mg respectively). The transamination of glyoxylate is mainly catalysed by this enzyme in ethanol-grown cells. When glucose-grown cells were incubated in medium containing ethanol as sole carbon source, the activity markedly increased, and the increase was completely blocked by cycloheximide, suggesting that the enzyme is synthesized de novo during the incubation period. Similarity in the amino acid composition was observed, but immunological cross-reactivity was not observed among alanine:glyoxylate aminotransferases from yeast and vertebrate liver.

Saccharomyces cerevisiae S288c can biosynthesize ..

7.6.1.2 Yeast No gene conversion was induced in  Saccharomyces cerevisiae D4 by morpholine concentrations up to 10 µg/litre per plate.

typhimurium TA98/100/1535/1537 not given RA 0.005-10 µl/plate -/- Texaco (1979a) 1538c Saccharomyces D4 not given RA 0.005-10 µl/platec -/- Texaco (1979a) cerevisiae S.

N2 - Alanine:glyoxylate aminotransferase (EC 2.6.1.44), which is involved in the glyoxylate pathway of glycine and serine biosynthesis from tricarboxylic acid-cycle intermediates in Saccharomyces cerevisiae, was highly purified and characterized. The enzyme had M(r) about 80,000, with two identical subunits. It was highly specific for L-alanine and glyoxylate and contained pyridoxal 5'-phosphate as cofactor. The apparent K(m) values were 2.1mM and 0.7 mM for L-alanine and glyoxylate respectively. The activity was low (10 nmol/min per mg of protein) with glucose as sole carbon source, but was remarkably high with ethanol or acetate as carbon source (930 and 430 nmol/min per mg respectively). The transamination of glyoxylate is mainly catalysed by this enzyme in ethanol-grown cells. When glucose-grown cells were incubated in medium containing ethanol as sole carbon source, the activity markedly increased, and the increase was completely blocked by cycloheximide, suggesting that the enzyme is synthesized de novo during the incubation period. Similarity in the amino acid composition was observed, but immunological cross-reactivity was not observed among alanine:glyoxylate aminotransferases from yeast and vertebrate liver.

Glycine biosynthesis (Saccharomyces cerevisiae) - …

Glycine biosynthesis (Saccharomyces cerevisiae) ..

17/01/2006 · Identification of Saccharomyces cerevisiae GLY1 as a ..
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