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TitlePlate tectonics of virus shell assembly and reorganization in phage φ8, a distant relative of mammalian reoviruses.
Journal, issue, pagesStructure, Vol. 21, Issue 8, Page 1384-1395, Year 2013
Publish dateAug 6, 2013
AuthorsKamel El Omari / Geoff Sutton / Janne J Ravantti / Hanwen Zhang / Thomas S Walter / Jonathan M Grimes / Dennis H Bamford / David I Stuart / Erika J Mancini /
PubMed AbstractThe hallmark of a virus is its capsid, which harbors the viral genome and is formed from protein subunits, which assemble following precise geometric rules. dsRNA viruses use an unusual protein ...The hallmark of a virus is its capsid, which harbors the viral genome and is formed from protein subunits, which assemble following precise geometric rules. dsRNA viruses use an unusual protein multiplicity (120 copies) to form their closed capsids. We have determined the atomic structure of the capsid protein (P1) from the dsRNA cystovirus Φ8. In the crystal P1 forms pentamers, very similar in shape to facets of empty procapsids, suggesting an unexpected assembly pathway that proceeds via a pentameric intermediate. Unlike the elongated proteins used by dsRNA mammalian reoviruses, P1 has a compact trapezoid-like shape and a distinct arrangement in the shell, with two near-identical conformers in nonequivalent structural environments. Nevertheless, structural similarity with the analogous protein from the mammalian viruses suggests a common ancestor. The unusual shape of the molecule may facilitate dramatic capsid expansion during phage maturation, allowing P1 to switch interaction interfaces to provide capsid plasticity.
External linksStructure / PubMed:23891291 / PubMed Central
MethodsX-ray diffraction / EM (single particle)
Resolution3.7 - 8.7 Å
Structure data

PDB-4btp:
Structure of the capsid protein P1 of the bacteriophage phi8
Method: X-RAY DIFFRACTION / Resolution: 3.7 Å

PDB-4bx4:
Fitting of the bacteriophage Phi8 P1 capsid protein into cryo-EM density
Method: ELECTRON MICROSCOPY / Resolution: 8.7 Å

Source
  • pseudomonas phage phi8 (bacteriophage)
KeywordsVIRAL PROTEIN / VIRUS / BACTERIOPHAGE

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