Publications [#234983] of Weitao Yang

Journal Articles
  1. Ping, L; Yang, W; Pedersen, LC; Negishi, M; Pedersen, LG, Searching for the minimum energy path in the sulfuryl transfer reaction catalyzed by human estrogen sulfotransferase: Role of enzyme dynamics, International Journal of Quantum Chemistry, vol. 106 no. 14 (2006), pp. 2981-2998 [doi] .

    Abstract:
    The enzymatic transfer of a sulfuryl group from the ubiquitous biological source of sulfate 3′-phosphoadenosine 5′-phosphosulfate (PAPS) to estrogen is investigated by the pseudo-bond quantum mechanical/molecular mechanical method (QM/MM) method. Calculations of the reaction path are performed starting with models based on two crystal structures, which differ in information about the cofactor and substrates. In addition, a subsequent relaxation of the enzyme was performed with the found transition state frozen, followed by redetermination of the path. An activation barrier of 22 kcal/mol is estimated. The reaction mechanism features a proton transfer from the estrogen to a catalytic histidine followed by the rate determining SO 3 transfer. The mechanism found is largely dissociative. © 2006 Wiley Periodicals, Inc.