Large-Scale, Protection-Free Synthesis of <i>Se</i>-Adenosyl-<scp>l</scp>-selenomethionine Analogues and Their Application as Cofactor Surrogates of Methyltransferases
                                
                                    
                                        作者:Ian R. Bothwell、Minkui Luo                                    
                                    
                                        DOI:10.1021/ol501169y
                                    
                                    
                                        日期:2014.6.6
                                    
                                    S-Adenosyl-L-methionine (SAM) analogues have previously demonstrated their utility as chemical reporters of methyltransferases. Here we describe the facile, large-scale synthesis of Se-alkyl Se-adenosyl-L-selenomethionine (SeAM) analogues and their precursor, Se-adenosyl-L-selenohomocysteine (SeAH). Comparison of SeAM analogues with their equivalent SAM analogues suggests that sulfonium-to- selenonium substitution can enhance their compatibility with certain protein methyltransferases, favoring otherwise less reactive SAM analogues. Ready access to SeAH therefore enables further application of SeAM analogues as chemical reporters of diverse methyltransferases.