8FUC

Crystal structure of mouse Importin alpha in complex with Hendra virus matrix protein minor site NLS2

8FUC の概要

• エントリーDOI: 10.2210/pdb8fuc/pdb
• 分子名称: Matrix protein, Importin subunit alpha-1, Contaminant peptide KKLARE, ... (4 entities in total)
• 機能のキーワード: complex, importin, nuclear transport, viral protein, transport protein
• 由来する生物種: Mus musculus (house mouse); 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 58256.02

構造登録者

Donnelly, C.M.,Basler, C.F.,Scott, C.,Forwood, J.K. (登録日: 2023-01-17, 公開日: 2023-01-25, 最終更新日: 2023-08-30)

主引用文献

Donnelly, C.M.,Vogel, O.A.,Edwards, M.R.,Taylor, P.E.,Roby, J.A.,Forwood, J.K.,Basler, C.F.
Henipavirus Matrix Protein Employs a Non-Classical Nuclear Localization Signal Binding Mechanism.
Viruses, 15:-, 2023

PubMed Abstract: Nipah virus (NiV) and Hendra virus (HeV) are highly pathogenic species from the genus within the paramyxovirus family and are harbored by Flying Fox species. Henipaviruses cause severe respiratory disease, neural symptoms, and encephalitis in various animals and humans, with human mortality rates exceeding 70% in some NiV outbreaks. The henipavirus matrix protein (M), which drives viral assembly and budding of the virion, also performs non-structural functions as a type I interferon antagonist. Interestingly, M also undergoes nuclear trafficking that mediates critical monoubiquitination for downstream cell sorting, membrane association, and budding processes. Based on the NiV and HeV M X-ray crystal structures and cell-based assays, M possesses a putative monopartite nuclear localization signal (NLS) (residues KRKKIR; NLS1 HeV), positioned on an exposed flexible loop and typical of how many NLSs bind importin alpha (IMPα), and a putative bipartite NLS (RR-10X-KRK; NLS2 HeV), positioned within an α-helix that is far less typical. Here, we employed X-ray crystallography to determine the binding interface of these M NLSs and IMPα. The interaction of both NLS peptides with IMPα was established, with NLS1 binding the IMPα major binding site, and NLS2 binding as a non-classical NLS to the minor site. Co-immunoprecipitation (co-IP) and immunofluorescence assays (IFA) confirm the critical role of NLS2, and specifically K258. Additionally, localization studies demonstrated a supportive role for NLS1 in M nuclear localization. These studies provide additional insight into the critical mechanisms of M nucleocytoplasmic transport, the study of which can provide a greater understanding of viral pathogenesis and uncover a potential target for novel therapeutics for henipaviral diseases.

PubMed: 37376602
DOI: 10.3390/v15061302

実験手法

X-RAY DIFFRACTION (2.1 Å)