Separation of neurospora crassa myo-inositol-1-phosphate synthase from glucose-6-phosphate dehydrogenase by affinity chromatography

J. Aradi, A. Zsindely, A. Kiss

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Abstract

The purification of Neurospora crassa myo-inositol-1-phosphate synthase (EC 5.5.1.4) was studied by affinity chromatography using the substrate (glucose-6-phosphate), the inhibitor (pyrophosphate), the coenzyme (NAD+) and the coenzyme analogues (5'AMP and Cibacron Blue F3G-A) of the enzyme as adsorbents attached to agarose gel. Myo-inositol-1-phosphate synthase could be separated completely from the contaminating substance, glucose-6- phosphate dehydrogenase (EC 1.1.1.49), on Blue Sepharose CL-613 and on pyrophosphate-Sepharose. The purified enzyme had a specific activity of 16 400 U/mg. The sodium dodecyl sulfate/polyacrylamide gel electrophoresis of 60 pg of this purified enzyme gave a homogenous band. The enzyme was found to be composed of four identical subunits having a molecular weight of 65 000.

Original languageEnglish
Pages (from-to)137-151
Number of pages15
JournalPreparative Biochemistry
Volume12
Issue number2
DOIs
Publication statusPublished - Jan 1 1982

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ASJC Scopus subject areas

  • Biochemistry
  • Genetics

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