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TitleVirus maturation involving large subunit rotations and local refolding.
Journal, issue, pagesScience, Vol. 292, Issue 5517, Page 744-748, Year 2001
Publish dateApr 27, 2001
AuthorsJ F Conway / W R Wikoff / N Cheng / R L Duda / R W Hendrix / J E Johnson / A C Steven /
PubMed AbstractLarge-scale conformational changes transform viral precursors into infectious virions. The structure of bacteriophage HK97 capsid, Head-II, was recently solved by crystallography, revealing a ...Large-scale conformational changes transform viral precursors into infectious virions. The structure of bacteriophage HK97 capsid, Head-II, was recently solved by crystallography, revealing a catenated cross-linked topology. We have visualized its precursor, Prohead-II, by cryoelectron microscopy and modeled the conformational change by appropriately adapting Head-II. Rigid-body rotations ( approximately 40 degrees) cause switching to an entirely different set of interactions; in addition, two motifs undergo refolding. These changes stabilize the capsid by increasing the surface area buried at interfaces and bringing the cross-link-forming residues, initially approximately 40 angstroms apart, close together. The inner surface of Prohead-II is negatively charged, suggesting that the transition is triggered electrostatically by DNA packaging.
External linksScience / PubMed:11326105
MethodsEM (single particle)
Resolution12 Å
Structure data

PDB-1if0:
PSEUDO-ATOMIC MODEL OF BACTERIOPHAGE HK97 PROCAPSID (PROHEAD II)
Method: ELECTRON MICROSCOPY / Resolution: 12.0 Å

Source
  • enterobacteria phage hk97 (virus)
KeywordsVIRUS / Bacteriophage / Capsid / cryoEM / Pseudo-atomic model. / Icosahedral virus

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