Transport of Free and Peptide-Bound Glycated Amino Acids: Synthesis, Transepithelial Flux at Caco-2 Cell Monolayers, and Interaction with Apical Membrane Transport Proteins
products (MRPs) do not permeate Caco‐2 monolayers when applied as small aminoacids. Bound in dipeptides, however, MRPs are transported into the cells in a manner dependent on their structures. Many Maillard dipeptides are substrates for the peptide transporter PEPT1. After intracellular hydrolysis, the MRPs leave the cells across their basolateral membranes.
l-Arginine appears to behave as a chelating ligand through carboxylate and -NH2 groups in Me2Sn(Arg)2, while in Nα-t-Boc-l-Arginine complex, the Nα-protected amino group being exempted from coordination, only the carboxylate groups are effectors of bonding to the organometallicmoieties. FT-IR spectra give a clear indication that guanidino groups in all the complexes are not involved in coordination, since
Presence of a dipeptidyl aminopeptidase III in Saccharomyces cerevisiae.
作者:Yasuhiro WATANABE、Yuka KUMAGAI、Yukio FUJIMOTO
DOI:10.1248/cpb.38.246
日期:——
The soluble fraction of a cell extract of Saccharomyces cerevisiae was found to contain hydrolytic activity toward arginyl-arginyl-β-naphthylamide (Arg-Arg-βNA). Most of the contaminating Arg-βNA hydrolysis activity was removed by diethylaminoethyl (DEAE)-cellulose column chromatography and the enzyme was partially purified. It is very similar in various properties to mammalian dipeptidyl aminopeptidase III (DAP III), although it differs slightly in some respects.
Synthesis of hpGRF(Somatocrinin) in liquid phase and intermediate
申请人:Sanofi
公开号:US04704450A1
公开(公告)日:1987-11-03
The invention relates to synthesis of hpGRF (Somatocrinin) in liquid phase and to intermediate peptides, comprising: coupling, one after the other and in the order of the sequence of the GRF, the fragments in which: (a) the side acid functions of the aspartic and glutamic acids and the side amine function of the lysine are protected by protector groups stable in the conditions of deprotection of the group Boc, (b) the guanidine function of the arginine is protected by protonation, and (c) the N-terminal amino acid is protected on the amine by the Boc group; selectively eliminating the group Boc from the N-terminal amine of the peptide in phase of elongation by hydrolysis with trifluoroacetic acid, said coupling being effected in an aprotic polar solvent and eliminating, at the end of sequence, all the protector groups by hydrolysis with the aid of a 0.1 to 1M solution of methanesulfonic or trifluoromethanesulfonic acid in trifluoroacetic acid.
Peptide-forming enzyme gene, peptide-forming enzyme, and peptide producing method
申请人:Tonouchi Naoto
公开号:US20050037453A1
公开(公告)日:2005-02-17
The present invention provides a method for producing dipeptide using inexpensively acquirable starting materials by an industrially advantageous and simple pathway. Dipeptide is produced from L-amino acid ester and L-amino acid using a culture of microbes having the ability to produce a dipeptide from an L-amino acid ester and an L-amino acid, using microbial cells isolated from the culture, or a treated microbial cell product of the microbe.