Transition-state analogues as inhibitors for GABA-aminotransferase
摘要:
Our previous calculations on the reaction catalysed by GABA-aminotransferase (GABA-T) have been utilized in this work in order to synthesize a series of reversible inhibitors of this enzyme. The synthesized transition-state analogues and their precursors inhibited GABA-T competitively in both the holoenzyme and apoenzyme at 10(-3) and 10(-5) M, respectively. In the case of the holoenzyme, the transition-state analogue series (the conformationally restricted series) gave a significant increase in inhibition values over the open (less conformationally restricted) series.
Transition-state analogues as inhibitors for GABA-aminotransferase
作者:MN Iskander、PR Andrews、DA Winkler、RI Brinkworth、C Di Paola、S Cavell、J Issa
DOI:10.1016/0223-5234(91)90022-f
日期:1991.3
Our previous calculations on the reaction catalysed by GABA-aminotransferase (GABA-T) have been utilized in this work in order to synthesize a series of reversible inhibitors of this enzyme. The synthesized transition-state analogues and their precursors inhibited GABA-T competitively in both the holoenzyme and apoenzyme at 10(-3) and 10(-5) M, respectively. In the case of the holoenzyme, the transition-state analogue series (the conformationally restricted series) gave a significant increase in inhibition values over the open (less conformationally restricted) series.
Isolation and characterization of the product of inactivation of γ-aminobutyric acid aminotransferase by gabaculine
作者:Mengmeng Fu、Richard B. Silverman
DOI:10.1016/s0968-0896(99)00081-4
日期:1999.8
Gabaculine (5-amino-1,3-cyclohexadienylcarboxylic acid, 1), a naturally occurring neurotoxin isolated from Streptomyces toyocaenis, has been shown to be a mechanism-based inactivator of gamma-aminobutyric acid aminotransferase (GABA-AT) (Rando, R. R. Biochemistry 1977, 16, 4604). Inactivation results from reaction of gabaculine with the pyridoxal 5'-phosphate (PLP) cofactor. Two HPLC systems for isolating