The First Experimental Test of the Hypothesis that Enzymes Have Evolved To Enhance Hydrogen Tunneling
作者:Kenneth M. Doll、Bruce R. Bender、Richard G. Finke
DOI:10.1021/ja030120h
日期:2003.9.1
strong evidence for the expected quantummechanicaltunneling in the Ado(*) and 8-MeOAdo(*)-mediated H(*) abstraction reactions from ethylene glycol. More importantly, a comparison of these enzyme-free tunneling data to the same KIE, (E(D) - E(H)) and A(H)/A(D) data for a closely related, Ado(*)-mediated H(*) abstraction reaction from a primary CH(3)- group in AdoCbl-dependent methylmalonyl-CoA mutase
The Elusive 5′-Deoxyadenosyl Radical: Captured and Characterized by Electron Paramagnetic Resonance and Electron Nuclear Double Resonance Spectroscopies
作者:Hao Yang、Elizabeth C. McDaniel、Stella Impano、Amanda S. Byer、Richard J. Jodts、Kenichi Yokoyama、William E. Broderick、Joan B. Broderick、Brian M. Hoffman
DOI:10.1021/jacs.9b05926
日期:2019.7.31
active site at 12 K using a novel approach involving cryogenic photoinduced electron transfer from the [4Fe–4S]+ cluster to the coordinated S-adenosylmethionine (SAM) to induce homolytic S–C5′ bond cleavage. We unequivocally reveal the structure of this long-sought radicalspecies through the use of electronparamagneticresonance (EPR) and electron nuclear double resonance (ENDOR) spectroscopies with