6crj
From Proteopedia
Mouse norovirus model using the crystal structure of MNV P domain and the Norwalkvirus shell domain
Structural highlights
Function[CAPSD_NVN68] Capsid protein self assembles to form an icosahedral capsid with a T=3 symmetry, about 38 nm in diameter, and consisting of 180 capsid proteins. A smaller form of capsid with a diameter of 23 nm might be capsid proteins assembled as icosahedron with T=1 symmetry. The capsid encapsulate the genomic RNA and VP2 proteins. Attaches virion to target cells by binding histo-blood group antigens present on gastroduodenal epithelial cells.[1] Soluble capsid protein may play a role in viral immunoevasion.[2] Publication Abstract from PubMedOur previous structural studies on intact, infectious murine norovirus 1 (MNV-1) virions demonstrated that the receptor binding protruding (P) domains are lifted off the inner shell of the virus. Here, the three-dimensional (3D) reconstructions of recombinant rabbit hemorrhagic disease virus (rRHDV) virus-like particles (VLPs) and intact MNV-1 were determined to approximately 8-A resolution. rRHDV also has a raised P domain, and therefore, this conformation is independent of infectivity and genus. The atomic structure of the MNV-1 P domain was used to interpret the MNV-1 reconstruction. Connections between the P and shell domains and between the floating P domains were modeled. This observed P-domain flexibility likely facilitates virus-host receptor interactions. High-resolution cryo-electron microscopy structures of murine norovirus 1 and rabbit hemorrhagic disease virus reveal marked flexibility in the receptor binding domains.,Katpally U, Voss NR, Cavazza T, Taube S, Rubin JR, Young VL, Stuckey J, Ward VK, Virgin HW 4th, Wobus CE, Smith TJ J Virol. 2010 Jun;84(11):5836-41. doi: 10.1128/JVI.00314-10. Epub 2010 Mar 24. PMID:20335264[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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