6PWS

Crystal structure of the cow C-type carbohydrate-recognition domain of CD23 in the presence of alpha-methyl mannoside

6PWS の概要

• エントリーDOI: 10.2210/pdb6pws/pdb
• 分子名称: Fc fragment of IgE receptor II, CALCIUM ION, methyl alpha-D-mannopyranoside, ... (4 entities in total)
• 機能のキーワード: crd, receptor, lectin, metal-binding, sugar binding protein
• 由来する生物種: Bos taurus (Bovine)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 15623.46

構造登録者

Weis, W.I.,Feinberg, H. (登録日: 2019-07-23, 公開日: 2019-09-11, 最終更新日: 2024-11-13)

主引用文献

Jegouzo, S.A.F.,Feinberg, H.,Morrison, A.G.,Holder, A.,May, A.,Huang, Z.,Jiang, L.,Lasanajak, Y.,Smith, D.F.,Werling, D.,Drickamer, K.,Weis, W.I.,Taylor, M.E.
CD23 is a glycan-binding receptor in some mammalian species.
J.Biol.Chem., 294:14845-14859, 2019

PubMed Abstract: CD23, the low-affinity IgE receptor found on B lymphocytes and other cells, contains a C-terminal lectin-like domain that resembles C-type carbohydrate-recognition domains (CRDs) found in many glycan-binding receptors. In most mammalian species, the CD23 residues required to form a sugar-binding site are present, although binding of CD23 to IgE does not involve sugars. Solid-phase binding competition assays, glycoprotein blotting experiments, and glycan array analysis employing the lectin-like domains of cow and mouse CD23 demonstrate that they bind to mannose, GlcNAc, glucose, and fucose and to glycoproteins that bear these sugars in nonreducing terminal positions. Crystal structures of the cow CRD in the presence of α-methyl mannoside and GlcNAcβ1-2Man reveal that a range of oligosaccharide ligands can be accommodated in an open binding site in which most interactions are with a single terminal sugar residue. Although mouse CD23 shows a pattern of monosaccharide and glycoprotein binding similar to cow CD23, the binding is weaker. In contrast, no sugar binding was observed in similar experiments with human CD23. The absence of sugar-binding activity correlates with accumulation of mutations in the gene for CD23 in the primate lineage leading to humans, resulting in loss of key sugar-binding residues. These results are consistent with a role for CD23 in many species as a receptor for potentially pathogenic microorganisms as well as IgE. However, the ability of CD23 to bind several different ligands varies between species, suggesting that it has distinct functions in different organisms.

PubMed: 31488546
DOI: 10.1074/jbc.RA119.010572

実験手法

X-RAY DIFFRACTION (1 Å)