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DNA Sequencing> | … an N-terminal His-Tag. The pET-28a(+)-GAD construct was confirmed by sequencing (GenScript Corp., Nanjing, China), and transformed into the host E. coli BL21 (DE3) competent cells by heat shock. E. coli BL21 (DE3) carrying … | Get A Quote |
Glutamate decarboxylase (GAD), which is a unique pyridoxal 5-phosphate (PLP)-dependent enzyme, can catalyze α-decarboxylation of l-glutamate (L-Glu) to γ-aminobutyrate (GABA). The crystal structure of GAD in complex with PLP from Lactobacillus brevis CGMCC 1306 was successfully solved by molecular-replacement, and refined at 2.2 Å resolution to an R factor of 18.76% (R = 23.08%). The coenzyme pyridoxal 5-phosphate (PLP) forms a Schiff base with the active-site residue Lys279 by continuous electron density map, which is critical for catalysis by PLP-dependent decarboxylase. Gel filtration showed that the active (pH 4.8) and inactive (pH 7.0) forms of GAD are all dimer. The residues (Ser126, Se... More