A triazole-templated ring-closing metathesis for constructing novel fused and bridged triazoles
作者:Xuejun Zhang、Richard P. Hsung、Hongyan Li
DOI:10.1039/b701040k
日期:——
The feasibility of trapping the vinyl copper intermediate generated in situ from azide-[3 + 2] cycloadditions and viability of employing these triazoles as unique templates for ring-closing metathesis are described here; this work effectively combines the two powerful reactions for the first time to construct various de novo fused and bridged triazoles that are otherwise not trivial to synthesize.
作者:Gabriela Chiosis、Julia Aguirre、Christopher V. Nicchitta
DOI:10.1016/j.bmcl.2006.03.092
日期:2006.7
The synthesis and evaluation of several chemical modulators of heat shock protein 90 (Hsp90) dimerization is presented. These agents may represent useful tools to study the importance of N-terminal dimerization and also to determine subunit interface(s) in Hsp90. (c) 2006 Elsevier Ltd. All rights reserved.
Bioorthogonal Profiling of Protein Methylation Using Azido Derivative of <i>S</i>-Adenosyl-<scp>l</scp>-methionine
作者:Kabirul Islam、Ian Bothwell、Yuling Chen、Caitlin Sengelaub、Rui Wang、Haiteng Deng、Minkui Luo
DOI:10.1021/ja2118333
日期:2012.4.4
Protein methyltransferases (PMTs) play critical roles in multiple biological processes. Because PMTs often function in vivo through forming multimeric protein complexes, dissecting their activities in the native contexts is challenging but relevant. To address such a need, we envisioned a Bioorthogonal Profiling of Protein Methylation (BPPM) technology, in which a SAM analogue cofactor can be utilized by multiple rationally engineered PMTs to label substrates of the corresponding native PMTs. Here, 4-azidobut-2-enyl derivative of S-adenosyl-L-methionine (Ab-SAM) was reported as a suitable BPPM cofactor. The resultant cofactor enzyme pairs were implemented to label specifically the substrates of closely related PMTs (e.g., EuHMT1 and EuHMT2) in a complex cellular mixture. The BPPM approach, coupled with mass spectrometric analysis, enables the identification of the nonhistone targets of EuHMT1/2. Comparison of EuHMT1/2's methylomes indicates that the two human PMTs, although similar in terms of their primary sequences, can act on the distinct sets of nonhistone targets. Given the conserved active sites of PMTs, Ab-SAM and its use in BPPM are expected to be transferable to other PMTs for target identification.