6ppi

Kaposi's sarcoma-associated herpesvirus (KSHV), C12 portal dodecamer structureKaposi's sarcoma-associated herpesvirus (KSHV), C12 portal dodecamer structure

6ppi, resolution 4.70Å Show:Asymmetric Unit Biological Assembly Structural highlights 6ppi is a 12 chain structure with sequence from Human herpesvirus 8. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 6ppb, 6ppd, 6pph Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [Q76RH0_HHV8] Forms a portal in the viral capsid through which viral DNA is translocated during DNA packaging. Assembles as a dodecamer at a single fivefold axe of the T=16 icosahedric capsid. Binds to the molecular motor that translocates the viral DNA, termed terminase.[HAMAP-Rule:MF_04012] Publication Abstract from PubMed Assembly of Kaposi's sarcoma-associated herpesvirus (KSHV) begins at a bacteriophage-like portal complex that nucleates formation of an icosahedral capsid with capsid-associated tegument complexes (CATCs) and facilitates translocation of an approximately 150-kb dsDNA genome, followed by acquisition of a pleomorphic tegument and envelope. Because of deviation from icosahedral symmetry, KSHV portal and tegument structures have largely been obscured in previous studies. Using symmetry-relaxed cryo-EM, we determined the in situ structure of the KSHV portal and its interactions with surrounding capsid proteins, CATCs, and the terminal end of KSHV's dsDNA genome. Our atomic models of the portal and capsid/CATC, together with visualization of CATCs' variable occupancy and alternate orientation of CATC-interacting vertex triplexes, suggest a mechanism whereby the portal orchestrates procapsid formation and asymmetric long-range determination of CATC attachment during DNA packaging prior to pleomorphic tegumentation/envelopment. Structure-based mutageneses confirm that a triplex deep binding groove for CATCs is a hotspot that holds promise for antiviral development. DNA-Packing Portal and Capsid-Associated Tegument Complexes in the Tumor Herpesvirus KSHV.,Gong D, Dai X, Jih J, Liu YT, Bi GQ, Sun R, Zhou ZH Cell. 2019 Sep 5;178(6):1329-1343.e12. doi: 10.1016/j.cell.2019.07.035. Epub 2019, Aug 22. PMID:31447177 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Portal protein