期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 347, 期 1, 页码 215-220出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2006.06.073
关键词
lectin; GlcNAc; T-antigen disaccharide; carbohydrate binding specificity; frontal affinity chromatography; Agaricus bisporus agglutinin
Agaricus bisporus agglutinin (ABA) is known as a useful lectin to detect T-antigen (Corel) disaccharide (Gal beta-GalNAc alpha) and related O-linked glycans. However, a recent X-ray crystallographic study revealed the presence of another intrinsic sugar-binding site, i.e., for GlcNAc. To confirm this possibility, detailed analysis was performed using two advanced methods: lectin microarray and frontal affinity chromatography (FAC). In the lectin microarray, intense signals were observed on ABA spots for both N-glycanase-treated and beta-glycanase/beta 1-4galactosidase-treated Cy3-labeled asialofetuin. This indicates substantial affinity for both O-linked and agalactosylated (GlcNAc-exposed) N-linked glycans. A further approach by FAC using 20 pNP and 130 PA-oligosaccharides demonstrated that ABA bound to Core I (K-d - 3.4 x 10(-6) M) and Core2 (1.9 x 10(-5) M) but not to Core3 and Core6 O-linked glycans. It also showed substantial affinity to mono-, bi-, and tri-antennary agalactosylated complex-type N-linked glycans (K-d > 1.8 x 10(-5) M). These results establish ABA as a lectin having dual sugar-binding sites with distinct specificity, i.e., for Gal-exposed beta-linked glycans and GlcNAc-exposed N-linked glycans. (c) 2006 Elsevier Inc. All rights reserved.
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