3LLZ

Crystal Structure Analysis of Maclura pomifera agglutinin complex with Gal-beta-1,3-GalNAc

3LLZ の概要

• エントリーDOI: 10.2210/pdb3llz/pdb
• 関連するPDBエントリー: 3LLY 3LM1
• 分子名称: Agglutinin alpha chain, Agglutinin beta-2 chain, beta-D-galactopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-galactopyranose, ... (4 entities in total)
• 機能のキーワード: maclura pomifera agglutinin, mpa, mpa complex, gal-beta-1, 3-galnac;, lectin, sugar binding protein
• 由来する生物種: Maclura pomifera (Osage orange); 詳細
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 16610.54

構造登録者

Huang, J.,Xu, Z.,Wang, D.,Ogato, C.,Hirama, T.,Palczewski, K.,Hazen, S.L.,Lee, X.,Young, N.M. (登録日: 2010-01-29, 公開日: 2010-09-22, 最終更新日: 2023-09-06)

主引用文献

Huang, J.,Xu, Z.,Wang, D.,Ogata, C.M.,Palczewski, K.,Lee, X.,Young, N.M.
Characterization of the secondary binding sites of Maclura pomifera agglutinin by glycan array and crystallographic analyses.
Glycobiology, 20:1643-1653, 2010

PubMed Abstract: The Maclura pomifera agglutinin (MPA) recognizes the T-antigen disaccharide Galβ1,3GalNAc mainly through interaction of the α-GalNAc moiety with its primary site, but the interactions of the two flanking subsites A and B with aglycones and substituents other than Gal, respectively, are not well understood. We therefore characterized the specificity of MPA in more detail by glycan microarray analysis and determined the crystal structures of MPA without ligand and in complexes with Galβ1,3GalNAc and p-nitrophenyl α-GalNAc. In both sugar complexes, pairs of ligands created inter-tetramer hydrogen-bond bridging networks. While subsite A showed increased affinity for hydrophobic aglycones, it also accommodated several sugar substituents. Notably, a GalNAc-O-tripeptide, a Tn-antigen mimic, showed lower affinity than these compounds in surface plasmon resonance (SPR) experiments. The glycan array data that showed subsite B accepted compounds in which the O3 position of the GalNAc was substituted with various sugars other than Gal, but substitutions at O6 led to inactivity. Additions to the Gal moiety of the disaccharide also had only small effects on reactivity. These results are all compatible with the features seen in the crystal structures.

PubMed: 20826825
DOI: 10.1093/glycob/cwq118

実験手法

X-RAY DIFFRACTION (1.55 Å)