The substrate specificity of yeast hexokinase: reaction with D-arabinose oxime.
By chromatography, electrophoresis, n.m.r. spectroscopy, and spectrophotometric assay, it has been shown that D-arabinose oxime acts as a weak substrate for yeast hexokinase. The enzyme-catalysed phosphorylation of the oxime, which exists as a mixture of E (80%) and Z (20%) acyclic forms in solution at equilibrium, is proposed to proceed via the transient formation of a furanoid species. Weak substrate-activity was also observed with 4-deoxy-D-xylo-hexose, but not with 5-deoxy-D-xylohexose. The relation of these and previous results concerning the carbohydrate-substrate specificity of yeast hexokinase in solution to X-ray crystallographic studies is discussed.
D001089:Arabinose / Q000031:analogs & derivatives; D006593:Hexokinase / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D010091:Oximes; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D013379:Substrate Specificity
D010091:Oximes; C024000:D-arabinose oxime; D001089:Arabinose; D006593:Hexokinase