2013.07.01,我院周丛照教授研究组在Journal of Biological Chemistry上在线发表论文:Structure and catalytic mechanism of yeast 4-amino-4-deoxychorismate lyase. 2013 Jul 1. [Epub ahead of print]

作 者:代亚男、池昌标、周康、成望、江永亮、任艳敏、阮科、陈宇星、周丛照*。
Abstract
Saccharomyces cerevisiae Abz2 is a pyridoxal 5'-phosphate (PLP)-dependent lyase that converts 4-amino-4-deoxychorismate (ADC) to para-aminobenzoate and pyruvate. To investigate the catalytic mechanism, we determined the 1.9 Å resolution crystal structure of Abz2 complexed with PLP, representing the first eukaryotic ADC lyase structure. Unlike Escherichia coli ADC lyase whose dimerization is critical to the formation of the active site, the overall structure of Abz2 displays as a monomer of two domains. At the interdomain cleft, a molecule of cofactor PLP forms a Schiff base with residue Lys251. Computational simulations defined a basic clamp to orientate the substrate ADC in a proper pose, which was validated by site-directed mutageneses combined with enzymatic activity assays. All together, we proposed a putative catalytic mechanism of a unique class of monomeric ADC lyases led by yeast Abz2.

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