New Insights into the Mechanism of CDP-<scp>d</scp>-Tyvelose 2-Epimerase: An Enzyme-Catalyzing Epimerization at an Unactivated Stereocenter
作者:Tina M. Hallis、Zongbao Zhao、Hung-wen Liu
DOI:10.1021/ja0022021
日期:2000.11.1
the well-studied UDP-d-galactose 4-epimerase, that can invert unactivated stereocenters. To study the mechanism of this enzyme, we have cloned and expressed the tyv gene that encodes CDP-d-tyvelose2-epimerase. The purified tetrameric protein contains approximately one equivalent of bound NAD+ per monomer and a small fraction of NADH. Four possible mechanisms involving NAD+ can be proposed for this enzyme;