Because sugar-binding proteins, so-called lectins, play important roles in many biological phenomena, the lectin-selective labeling should be useful for investigating biological processes involving lectins as well as providing molecular tools for analysis of saccharides and these derivatives. We describe herein a new strategy for lectin-selective labeling based on an acyl transfer reaction directed by ligand-tethered DIVIAP (4-dimethylaminopyridine). DIVIAP is an effective acyl transfer catalyst, which can activate an acyl ester for its transfer to a nucleophilic residue. To direct the acyl transfer reaction to a lectin of interest, we attached the DIVIAP to a saccharide ligand specific for the target lectin. It was clearly demonstrated by biochemical analyses that the target-selective labeling of Congerin II, an animal lectin having selective affinity for Lactose/LacNAc (N-acetyllactosamine), was achieved in the presence of Lac-tethered DMAPs and acyl donors containing probes such as fluorescent molecules or biotin. Conventional peptide mapping experiments using HPLC and tandem mass-mass analysis revealed that the acyl transfer reaction site-specifically occurred at Tyr 51 of Cong II. This strategy was successfully extended to other lectins by changing the ligand part of the ligand-tethered DMAP. We also demonstrated that this labeling method is applicable not only to purified lectin in test tubes, but also to crude mixtures such as E coli lysates or homogenized animal tissue samples expressing Congerin.
Poly(ethylenimines) with alternative (alkylamino)pyridines as nucleophilic catalysts
作者:Edward J. Delaney、Leigh E. Wood、Irving M. Klotz
DOI:10.1021/ja00367a025
日期:1982.2
ARTIFICIAL CATALYST SYSTEM CAPABLE OF SUBSTITUTING FOR IN VIVO ACYLATION FUNCTION
申请人:The University of Tokyo
公开号:EP3156411B1
公开(公告)日:2021-03-03
ARTIFICIAL CATALYST SYSTEM SUBSTITUTABLE FOR IN VIVO ACYLATION FUNCTION
申请人:The University of Tokyo
公开号:US20170008927A1
公开(公告)日:2017-01-12
An artificial catalyst system substitutable for an in vivo histone acylation function has been successfully established by such an approach of synthetic chromosome acylation using a combination of a chromosome-localizable nucleophilic catalyst and a chromosome-localizable acylating agent.