Palladium-Mediated Approach to Coumarin-Functionalized Amino Acids
作者:Lindon W. K. Moodie、Samy Chammaa、Tomas Kindahl、Christian Hedberg
DOI:10.1021/acs.orglett.7b00854
日期:2017.6.2
hylglycine into proteins is a valuable biological tool. Coumarins are typically accessed via the Pechmann reaction, which requires acidic conditions and lacks substrate flexibility. A Pd-mediated coupling is described between o-methoxyboronic acids and a glutamic acid derived (Z)-vinyl triflate, forming latent coumarins. Global deprotection with BBr3 forms the coumarin scaffold in a single step. This
HIGH-SENSITIVE FLUORESCENT ENERGY TRANSFER ASSAY USING FLUORESCENT AMINO ACIDS AND FLUORESENT PROTEINS
申请人:The Regents of the University of California
公开号:US20150369800A1
公开(公告)日:2015-12-24
The disclosure provides method and composition utilizing fluorescent amino acids and fluorescent proteins comprising a moiety capable of undergoing FRET. The methods and compositions of the disclosure are useful in analyzing protein structure and function, and screening molecular inhibitors.
Hydration of proteins profoundly affects their functions. We describe a simple and general method for site-specific analysis of protein hydration based on the in vivo incorporation of fluorescent unnaturalaminoacids and their analysis by steady-state fluorescence spectroscopy. Using this method, we investigate the hydration of functionally important regions of dehalogenases. The experimental results
Improving a Natural Enzyme Activity through Incorporation of Unnatural Amino Acids
作者:Isaac N. Ugwumba、Kiyoshi Ozawa、Zhi-Qiang Xu、Fernanda Ely、Jee-Loon Foo、Anthony J. Herlt、Chris Coppin、Sue Brown、Matthew C. Taylor、David L. Ollis、Lewis N. Mander、Gerhard Schenk、Nicholas E. Dixon、Gottfried Otting、John G. Oakeshott、Colin J. Jackson
DOI:10.1021/ja106416g
日期:2011.1.19
4-nitrophenolate product of paraoxon hydrolysis. The 8-11-fold improvement of this already highly efficient catalyst through a single rationally designed mutation using an unnaturalaminoacid stands in contrast to the difficulty in improving this native activity through screening hundreds of thousands of mutants with natural aminoacids. These results demonstrate that designer aminoacids provide easy access to
A modified Pifl-like helicase, a construct containing a Pifl-like helicase, and an application thereof in characterizing a target polynucleotide or controlling the movement of a target polynucleotide passing through pores. The present invention also relates to a method for characterizing a target polynucleotide or controlling the movement of a target polynucleotide passing through pores. The Pifl-like helicase can effectively control the movement of a polynucleotide passing through pores and increase the accuracy of a chain sequencing process.