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. 1988 Feb;13(2):147-51.
doi: 10.1007/BF00973326.

The measurement of gamma-glutamyl hydrolase (conjugase) activity in rat brain

D M Hartley  1 , S R Snodgrass, P A Bradshaw
Affiliations

The measurement of gamma-glutamyl hydrolase (conjugase) activity in rat brain

D M Hartley et al. Neurochem Res. 1988 Feb.

Abstract

An assay using the artificial substrate, 2,4-diamino-10-methyl-pteroylglutamyl-gamma-glutamate (MTX-G1), was developed to measure gamma-glutamyl hydrolase (conjugase), which hydrolyzes folylpolyglutamates. This assay allows us to: 1) measure conjugase for the first time in rat brain and 2) measure conjugase in a reliable, sensitive and inexpensive manner. The MTX-binding assay results were compared to samples analyzed by HPLC and found to vary by only 13%. The artificial substrate, MTX-G1, had a lower rate of hydrolysis than pteroylglutamyl-gamma-glutamate (Pte-G2), 70.7 +/- 0.64 and 92.6 +/- 0.22 nmoles/hr/mg protein respectively. Conjugase was semi-purified 24 fold in H2O and found to have a pH optimum of 5.0.

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