Biosynthesis of Terpenoids: Efficient Multistep Biotransformation Procedures Affording Isotope-Labeled 2C-Methyl-d-erythritol 4-Phosphate Using Recombinant 2C-Methyl-d-erythritol 4-Phosphate Synthase
摘要:
This paper describes the recombinant expression of the ispC gene of Escherichia coli specifying 2C-methyl-D-erythritol 4-phosphate synthase in a modified form that can be purified efficiently by metal-chelating chromatography. The enzyme was used for the preparation of isotope-labeled 2C-methyl-D-erythritol 4-phosphate employing isotope-labeled glucose and pyruvate as starting materials. The simple one-pot methods described afford numerous isotopomers of 2C-methyl-D-erythritol 4-phosphate carrying H-3, C-13, or C-14 from commercially available precursors. The overall yield based on the respective isotope-labeled starting material is approximately 50%.
This paper describes the recombinant expression of the ispC gene of Escherichia coli specifying 2C-methyl-D-erythritol 4-phosphate synthase in a modified form that can be purified efficiently by metal-chelating chromatography. The enzyme was used for the preparation of isotope-labeled 2C-methyl-D-erythritol 4-phosphate employing isotope-labeled glucose and pyruvate as starting materials. The simple one-pot methods described afford numerous isotopomers of 2C-methyl-D-erythritol 4-phosphate carrying H-3, C-13, or C-14 from commercially available precursors. The overall yield based on the respective isotope-labeled starting material is approximately 50%.
The preparation and susceptibility to hydrolysis of novel O-galacturonoyl derivatives of carbohydrates
作者:John A. Brown、Stephen C. Fry
DOI:10.1016/0008-6215(93)84175-6
日期:1993.2
(1-->4)-alpha-D-galacturonan reacted in aqueous pyridine in the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide with alcohols to yield esters. The alcohols that gave high yields of D-galacturonoyl derivatives were primary and included methanol, ethanol, 1-propanol, D-glucose, D-galactose, methyl beta-D-glucopyranoside, methyl beta-D-galactopyranoside, and cellulose. D-Galacturonic acid itself readily