α-C-Mannosyltryptophan is not recognized by conventional mannose-binding lectins
摘要:
alpha-C-Mannosyltryptophan (C-Man-Trp) is a novel, naturally occurring C-linked carbohydrate-protein linkage first found in 1994 from human ribonuclease 2. Since then, a number of C-Man-Trp residue have been found from several important proteins such as interleukin 12beta, components of complement system, thrombospondin-1, and erythropoietin receptor, however, the biological functions have remained unknown even though its biosynthetic pathway has been revealed. In order to find a clue as to the biological functions, we examined the affinity of C-Man-Trp with conventional mannose lectin such as concanavarin A (Con A) and mannose-binding lectin (MBL). The affinity of C-Man-Trp with Con A, a typical mannose-binding lectin from plant was examined using a Con A-Sepharose column. Unlike.p-nitrophenyl-alpha-O-Man, C-Man-Trp was not retained on the column. MBL-C, a major mannose-binding lectin purified from mouse serum, did not bind with N-biotinylated C-Man-Trp, judging from ELISA based assay. These results imply that C-Man-Trp may be recognized with the other specific proteins associated with its unknown biological functions. (C) 2004 Elsevier Ltd. All rights reserved.
Compound 2-amino-3-[2-(&agr;-mannopyranosyl)indol-3-yl]propionic acid, process for preparing the same, and method for inspecting function of living body with the novel compound
申请人:Kyowa Medex Co., Ltd.
公开号:US06610502B1
公开(公告)日:2003-08-26
The present invention relates to a novel endogenous compound 2-amino-3-[2-(&agr;-mannopyranosyl)indole-3-yl]propionic acid; to a method for testing a biological function by quantitating 2-amino-3-[2-(&agr;-mannopyranosyl)indole-3-yl]propionic acid in a collected biological sample and determining the biological function based on the quantitated values; to an antibody specifically reactive with 2-amino-3-[2-(&agr;-mannopyranosyl)indole-3-yl]propionic acid; to a hybridoma that produces the antibody; to a method for immunologically quantitating 2-amino-3-[2-(&agr;-mannopyranosyl)indole-3-yl]propionic acid in a sample by using the antibody; and to a process for producing a 2-amino-3-[2-(&agr;-mannopyranosyl)indole-3-yl]propionic acid derivative.
We describe the palladium-catalyzed direct C–H glycosylation of free N-H indole or tryptophan for the stereoselective synthesis of 2-glycosylindoles and tryptophan-C-glycosides. This reaction relies on the ortho-directing transient mediator norbornene, which underwent regioselectiveC–H functionalization at the indole or tryptophan ring, providing high chemoselectivity. This method offers a more straightforward
NOVEL COMPOUND 2-AMINO-3-[2-(a)-MANNOPYRANOSYL)INDOL-3-YL]PROPIONIC ACID, PROCESS FOR PREPARING THE SAME, AND METHOD FOR INSPECTING FUNCTION OF LIVING BODY WITH THE NOVEL COMPOUND
申请人:KYOWA MEDEX CO., LTD.
公开号:EP1016866A1
公开(公告)日:2000-07-05
A novel in vivo compound 2-amino-3-[2-(α-mannopyranosyl)indol-3-yl]propionic acid; a method for inspecting the function of the living body, characterized by quantitatively determining 2-amino-3-[2-(α-mannopyranosyl)indol-3-yl]propionic acid in a harvested living body sample and judging the function of the living body from the determined value; an antibody which specifically reacts with 2-amino-3-[2-(α-mannopyranosyl)indol-3-yl]propionic acid; a hybridoma which produces the antibody; a method for immunologically assaying 2-amino-3-[2-(α-mannopyranosyl)indol-3-yl]propionic acid, characterized by immunologically assaying 2-amino-3-[2-(α-mannopyranosyl)indol-3-yl]propionic acid in a sample with the antibody; and a process for preparing 2-amino-3-[2-(α-mannopyranosyl)indol-3-yl]propionic acid derivatives.
NOVEL COMPOUND 2-AMINO-3-[2-(ALPHA-MANNOPYRANOSYL) INDOL-3-YL] PROPIONIC ACID, PROCESS FOR PREPARING THE SAME, AND METHOD FOR INSPECTING FUNCTION OF LIVING BODY WITH THE NOVEL COMPOUND