4FMI

Merkel cell polyomavirus VP1 in complex with 3'-sialyllactosamine

4FMI の概要

• エントリーDOI: 10.2210/pdb4fmi/pdb
• 関連するPDBエントリー: 4FMG 4FMH 4FMJ
• 関連するBIRD辞書のPRD_ID: PRD_900067
• 分子名称: VP1, N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose, ... (7 entities in total)
• 機能のキーワード: viral capsid protein, jelly roll, encapsidation, receptor binding, sialylated oligosaccharides, viral protein
• 由来する生物種: Merkel cell polyomavirus
• タンパク質・核酸の鎖数: 20
• 化学式量合計: 643354.50

構造登録者

Neu, U.,Hengel, H.,Stehle, T. (登録日: 2012-06-17, 公開日: 2012-09-05, 最終更新日: 2024-10-16)

主引用文献

Neu, U.,Hengel, H.,Blaum, B.S.,Schowalter, R.M.,Macejak, D.,Gilbert, M.,Wakarchuk, W.W.,Imamura, A.,Ando, H.,Kiso, M.,Arnberg, N.,Garcea, R.L.,Peters, T.,Buck, C.B.,Stehle, T.
Structures of Merkel Cell Polyomavirus VP1 Complexes Define a Sialic Acid Binding Site Required for Infection.
Plos Pathog., 8:e1002738-e1002738, 2012

PubMed Abstract: The recently discovered human Merkel cell polyomavirus (MCPyV or MCV) causes the aggressive Merkel cell carcinoma (MCC) in the skin of immunocompromised individuals. Conflicting reports suggest that cellular glycans containing sialic acid (Neu5Ac) may play a role in MCPyV infectious entry. To address this question, we solved X-ray structures of the MCPyV major capsid protein VP1 both alone and in complex with several sialylated oligosaccharides. A shallow binding site on the apical surface of the VP1 capsomer recognizes the disaccharide Neu5Ac-α2,3-Gal through a complex network of interactions. MCPyV engages Neu5Ac in an orientation and with contacts that differ markedly from those observed in other polyomavirus complexes with sialylated receptors. Mutations in the Neu5Ac binding site abolish MCPyV infection, highlighting the relevance of the Neu5Ac interaction for MCPyV entry. Our study thus provides a powerful platform for the development of MCPyV-specific vaccines and antivirals. Interestingly, engagement of sialic acid does not interfere with initial attachment of MCPyV to cells, consistent with a previous proposal that attachment is mediated by a class of non-sialylated carbohydrates called glycosaminoglycans. Our results therefore suggest a model in which sialylated glycans serve as secondary, post-attachment co-receptors during MCPyV infectious entry. Since cell-surface glycans typically serve as primary attachment receptors for many viruses, we identify here a new role for glycans in mediating, and perhaps even modulating, post-attachment entry processes.

PubMed: 22910713
DOI: 10.1371/journal.ppat.1002738

実験手法

X-RAY DIFFRACTION (2 Å)