SYNTHESIS OF L-ARABINOSE-5-C14

Synthesis of C14-Labeled L-Sorbose and L-Ascorbic Acid

A m ethod is prese nted for preparing C'4-l abeled L-ascorbi c acid (vi tamin C) from labeled banum D-gluconate or D-glucose. The process is adapted from t he commercial synthesis of vi tamin C t hrough sorbitol, L-sorbose and potassium di-O-isopropylidene-2kelo-L-guloll.ate. In .th e cyanohydrin . synt hesis of labeled D-glucose, barium D-gluconate is used as an lI1term ed~at~ . Fo: prepanng l...

Requirement of adenosine-3',5'-cyclic monophosphate for L-arabinose isomerase synthesis in Escherichia coli.

Adenosine-3', 5'-cyclic monophosphate (cyclic AMP) is essential for the synthesis of l-arabinose isomerase in Escherichia coli. Cyclic AMP appears to be required for the transcription of deoxyribonucleic acid into messenger ribonucleic acid (RNA), since the enzyme synthesis is not observed in induced cells to which cyclic AMP is added after messenger RNA synthesis is arrested by rifampin or aft...

The synthesis of 3,4-benzpyrene-5-C14 and of 2-acetylaminofluorene-9-C14.

L-Arabinose-sensitive, L-ribulose 5-phosphate 4-epimerase-deficient mutants of Escherichia coli.

Englesberg, E. (University of Pittsburgh, Pittsburgh, Pa.), R L. Anderson, R. Weinberg, N. Lee, P. Hoffee, G. Huttenhauer, and H. Boyer. l-Arabinose-sensitive, l-ribulose 5-phosphate 4-epimerase-deficient mutants of Escherichia coli. J. Bacteriol. 84:137-146. 1962-l-Arabinose-negative mutants of Escherichia coli B/r, ara-53 and ara-139, are deficient in the enzyme l-ribulose 5-phosphate 4-epime...

L-arabinose operon of Escherichia coli

TIG December 2000, volume 16, No. 12 559 Over forty years of research on the L-arabinose operon of Escherichia coli have provided insights into the mechanism of positive regulation of gene activity. This research also discovered DNA looping and the mechanism by which the regulatory protein changes its DNA-binding properties in response to the presence of arabinose. As is frequently seen in focu...