期刊
ACS CHEMICAL BIOLOGY
卷 10, 期 9, 页码 2087-2098出版社
AMER CHEMICAL SOC
DOI: 10.1021/acschembio.5b00212
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资金
- National Institutes of Health [GM066132, DA030604, GM067725]
- Federal funds from National Cancer Institute [ACB-12002]
- National Institute of General Medical Sciences [AGM-12006]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- International Institute of Nanotechnology
When gamma-aminobutyric acid (GABA), the major inhibitory neurotransmitter in the mammalian central nervous system, falls below a threshold level, seizures occur. One approach to raise GABA concentrations is to inhibit GABA aminotransferase (GABA-AT), a pyridoxal 5'-phosphate-dependent enzyme that degrades GABA. We have previously developed (1S,3S)-3-amino-4-difluoromethylene-1-cyclopentanoic acid (CPP-115), which is 186 times more efficient in inactivating GABA-AT than vigabatrin, the only FDA-approved inactivator of GABA-AT. We also developed (E)- and (Z)-(1S,3S)-3-amino-4-fluoromethylenyl-1-cyclopentanoic acid (1 and 2, respectively), monofluorinated analogs of CPP-115, which are comparable to vigabatrin in inactivating GABA-AT. Here, we report the mechanism of inactivation of GABA-AT by 1 and 2. Both produce a metabolite that induces disruption of the Glu270-Arg445 salt bridge to accommodate interaction between the metabolite formyl group and Arg445. This is the second time that Arg445 has interacted with a ligand and is involved in GABA-AT inactivation, thereby confirming the importance of Arg445 in future inactivator design.
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