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TitleVirus capsid expansion driven by the capture of mobile surface loops.
Journal, issue, pagesStructure, Vol. 16, Issue 10, Page 1491-1502, Year 2008
Publish dateOct 8, 2008
AuthorsKelly K Lee / Lu Gan / Hiro Tsuruta / Crystal Moyer / James F Conway / Robert L Duda / Roger W Hendrix / Alasdair C Steven / John E Johnson /
PubMed AbstractThe capsids of tailed-DNA bacteriophages first assemble as procapsids, which mature by converting into a new form that is strong enough to contain a densely packed viral chromosome. We demonstrate ...The capsids of tailed-DNA bacteriophages first assemble as procapsids, which mature by converting into a new form that is strong enough to contain a densely packed viral chromosome. We demonstrate that the intersubunit crosslinking that occurs during maturation of HK97 capsids actually promotes the structural transformation. Small-angle X-ray scattering and crosslinking assays reveal that a shift in the crosslink pattern accompanies conversion of a semimature particle, Expansion Intermediate-I/II, to a more mature state, Balloon. This transition occurs in a switch-like fashion. We find that crosslink formation shifts the global conformational balance to favor the balloon state. A pseudoatomic model of EI-I/II derived from cryo-EM provides insight into the relationship between crosslink formation and conformational switching.
External linksStructure / PubMed:18940605 / PubMed Central
MethodsEM (single particle)
Structure data

PDB-3ddx:
HK97 bacteriophage capsid Expansion Intermediate-II model
Method: ELECTRON MICROSCOPY

Source
  • bacteriophage hk97 (virus)
KeywordsVIRUS / Bacteriophage / HK97 / Capsid Protein / Expansion Intermediate / Virion / icosahedral virus

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