4-aminobutyrate aminotransferase (ABAT) is responsible for catabolism of gamma-aminobutyric acid (GABA), an important, mostly inhibitory neurotransmitter in the central nervous system, into succinic semialdehyde. The active enzyme is a homodimer of 50kD subunits complexed to pyridoxal-5-phosphate. The protein sequence is over 95% similar to the pig protein. GABA is estimated to be present in nearly one-third of human synapses. ABAT in liver and brain is controlled by 2 codominant alleles with a frequency in a Caucasian population of 0.56 and 0.44. The ABAT deficiency phenotype includes psychomotor retardation, hypotonia, hyperreflexia, lethargy, refractory seizures, and EEG abnormalities. Multiple alternatively spliced transcript variants encoding the same protein isoform have been found for this gene. Recombinant protein corresponding to aa29-500 from human ABAT, fused to 10xHis-SUMO-Tag at N-terminal and Myc-Tag at C-terminal, expressed in E. coli. Molecular Weight: ~73.3kD AA Sequence: SQ AAAKVDVEFD YDGPLMKTEV PGPRSQELMK QLNIIQNAEA VHFFCNYEES RGNYLVDVDG NRMLDLYSQI SSVPIGYSHP ALLKLIQQPQ NASMFVNRPA LGILPPENFV EKLRQSLLSV APKGMSQLIT MACGSCSNEN ALKTIFMWYR SKERGQRGFS QEELETCMIN QAPGCPDYSI LSFMGAFHGR TMGCLATTHS KAIHKIDIPS FDWPIAPFPR LKYPLEEFVK ENQQEEARCL EEVEDLIVKY RKKKKTVAGI IVEPIQSEGG DNHASDDFFR KLRDIARKHG CAFLVDEVQT GGGCTGKFWA HEHWGLDDPA DVMTFSKKMM TGGFFHKEEF RPNAPYRIFN TWLGDPSKNL LLAEVINIIK REDLLNNAAH AGKALLTGLL DLQARYPQFI SRVRGRGTFC SFDTPDDSIR NKLILIARNK GVVLGGCGDK SIRFRPTLVF RDHHAHLFLN IFSDILADFK Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 6 months after receipt at -20C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
