5W41

Zika MR766 NLS in complex with Importin alpha subunit-1

Summary for 5W41

• Entry DOI: 10.2210/pdb5w41/pdb
• Descriptor: Importin subunit alpha-1, ZIKA MR766 NLS (3 entities in total)
• Functional Keywords: zika, nuclear transport, importin, karyopherin, virus, mr766, viral protein-protein binding complex, viral protein/protein binding
• Biological source: Mus musculus (Mouse); More
• Total number of polymer chains: 2
• Total formula weight: 59940.96

Authors

Jeffress, S.,Smith, K.M.,Forwood, J.K. (deposition date: 2017-06-08, release date: 2018-06-13, Last modification date: 2023-10-04)

Primary citation

Ng, I.H.W.,Chan, K.,Tan, M.J.A.,Gwee, C.P.,Smith, K.M.,Jeffress, S.J.,Saw, W.G.,Swarbrick, C.M.D.,Watanabe, S.,Jans, D.,Gruber, G.,Forwood, J.K.,Vasudevan, S.G.
Zika virus NS5 forms supramolecular nuclear bodies that sequester importin alpha and modulate the host immune and pro-inflammatory response in neuronal cells.
ACS Infect Dis, 2019

PubMed Abstract: The Zika virus (ZIKV) epidemic in the Americas was alarming because of its link with microcephaly in neonates and Guillain-Barré syndrome in adults. The unusual pathologies induced by ZIKV infection and the knowledge that the flaviviral nonstructural protein 5 (NS5), the most conserved protein in the flavivirus proteome, can modulate the host immune response during ZIKV infection prompted us to investigate the subcellular localization of NS5 during ZIKV infection and explore its functional significance. A monopartite nuclear localization signal (NLS) sequence within ZIKV NS5 was predicted by the cNLS Mapper program, and we observed localization of ZIKV NS5 in the nucleus of infected cells by immunostaining with specific antibodies. Strikingly, ZIKV NS5 forms spherical shell-like nuclear bodies that exclude DNA. The putative monopartite NLS KRPR is necessary to direct FLAG-tagged NS5 to the nucleus as the NS5 ARPA mutant protein accumulates in the cytoplasm. Furthermore, coimmunostaining experiments reveal that NS5 localizes with and sequesters importin-α, but not importin-β, in the observed nuclear bodies during virus infection. Structural and biochemical data demonstrate binding of ZIKV NS5 with importin-α and reveal important binding determinants required for their interaction and formation of complexes that give rise to the supramolecular nuclear bodies. Significantly, we demonstrate a neuronal-specific activation of the host immune response to ZIKV infection and a possible role of ZIKV NS5's nuclear localization toward this activation. This suggests that ZIKV pathogenesis may arise from a tissue-specific host response to ZIKV infection.

PubMed: 30848123
DOI: 10.1021/acsinfecdis.8b00373

Experimental method

X-RAY DIFFRACTION (2.2 Å)