4KPQ

Structure and receptor binding specificity of the hemagglutinin H13 from avian influenza A virus H13N6

4KPQ の概要

• エントリーDOI: 10.2210/pdb4kpq/pdb
• 関連するPDBエントリー: 4KPS
• 分子名称: Hemagglutinin, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (4 entities in total)
• 機能のキーワード: receptor binding, viral protein
• 由来する生物種: Influenza A virus; 詳細
• 細胞内の位置: Virion membrane; Single-pass type I membrane protein (Potential): P13103 P13103
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 169835.76

構造登録者

Lu, X.,Qi, J.,Shi, Y.,Gao, G. (登録日: 2013-05-14, 公開日: 2013-07-03, 最終更新日: 2024-11-06)

主引用文献

Lu, X.,Qi, J.,Shi, Y.,Wang, M.,Smith, D.F.,Heimburg-Molinaro, J.,Zhang, Y.,Paulson, J.C.,Xiao, H.,Gao, G.F.
Structure and Receptor Binding Specificity of Hemagglutinin H13 from Avian Influenza A Virus H13N6
J.Virol., 87:9077-9085, 2013

PubMed Abstract: Interspecies transmission (host switching/jumping) of influenza viruses is a key scientific question that must be addressed. In addition to the vigorous research on highly pathogenic avian influenza viruses (HPAIVs), studies of the mechanism of interspecies transmission of low-pathogenic avian influenza viruses (LPAIVs) could also provide insights into host tropism and virulence evolution. Influenza A viruses harboring hemagglutinin (HA) H13 (e.g., H13N6) are LPAIVs. In this study, soluble H13 HA glycoprotein was purified, and its receptor binding activity was characterized. The results revealed that H13 exclusively binds the avian α2-3-linked sialic acid receptor; no binding to the mammalian α2-6-linked sialic acid receptor was detected. Furthermore, the molecular basis of the H13 receptor binding specificity was revealed by comparative analysis of the crystal structures of both receptor-bound H13 and H5 HAs, which might be contributed by the hydrophobic residue V186. Work with an H13N186 mutant confirmed the importance of V186 in the receptor binding specificity of H13 HA, which shows that the mutant protein reduced the binding of an avian receptor analog but increased the binding of a human receptor analog. Detailed structural analysis also demonstrated that the conserved binding sites of the recently well-studied broadly neutralizing human monoclonal antibodies targeting the HA2 domain are found in H13. Our results expand our understanding of virulence evolution, receptor binding preference, and species tropism of the LPAIVs and HPAIVs.

PubMed: 23760233
DOI: 10.1128/JVI.00235-13

実験手法

X-RAY DIFFRACTION (2.502 Å)