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B6db references: 8385114

type Journal Article
authors Park, J.; Osei, Y.D.; Churchich, J.E.
title Isolation and characterization of recombinant mitochondrial 4-aminobutyrate aminotransferase
journal J Biol Chem
sel selected
ui 8385114
year (1993)
volume 268
number 11
pages 7636-9
abstract - 4-Aminobutyrate aminotransferase, which catalyzes the conversion of 4-aminobutyrate to succinic semialdehyde, is a key enzyme of the 4-aminobutyrate shunt. The amino acid sequence predicted from the cDNA sequence shows that the precursor protein consists of the mature enzyme of 473 amino acid residues and an amino-terminal segment of 27 amino acids (Kwon, O. S., Park, J., and Churchich, J. E. (1992) J. Biol. Chem. 267, 7215-7216). A recombinant 4-aminobutyrate aminotransferase has been expressed in Escherichia coli using pETIId as expression vector. The protein has been purified and characterized as a dimer (2 x 55 kDa). NH2-terminal sequence analysis has revealed the presence of an extra amino-terminal segment (signal peptide) predicted from the cDNA sequence. The isolated precursor of 4-aminobutyrate aminotransferase contains pyridoxal 5-phosphate and exhibits catalytic activity (18 units/mg) comparable to that of the mature enzyme (20 units/mg). The presequence peptide of the precursor of mitochondrial 4-aminobutyrate aminotransferase does not interfere with the folding and functional properties of the mature moiety of the aminotransferase.
last changed 2009/01/09 13:32

B6db references