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TitleThe structure of an infectious P22 virion shows the signal for headful DNA packaging.
Journal, issue, pagesScience, Vol. 312, Issue 5781, Page 1791-1795, Year 2006
Publish dateJun 23, 2006
AuthorsGabriel C Lander / Liang Tang / Sherwood R Casjens / Eddie B Gilcrease / Peter Prevelige / Anton Poliakov / Clinton S Potter / Bridget Carragher / John E Johnson /
PubMed AbstractBacteriophages, herpesviruses, and other large double-stranded DNA (dsDNA) viruses contain molecular machines that pump DNA into preassembled procapsids, generating internal capsid pressures ...Bacteriophages, herpesviruses, and other large double-stranded DNA (dsDNA) viruses contain molecular machines that pump DNA into preassembled procapsids, generating internal capsid pressures exceeding, by 10-fold, that of bottled champagne. A 17 angstrom resolution asymmetric reconstruction of the infectious P22 virion reveals that tightly spooled DNA about the portal dodecamer forces a conformation that is significantly different from that observed in isolated portals assembled from ectopically expressed protein. We propose that the tight dsDNA spooling activates the switch that signals the headful chromosome packing density to the particle exterior.
External linksScience / PubMed:16709746
MethodsEM (single particle)
Resolution17.0 Å
Structure data

EMDB-1220:
The structure of an infectious P22 virion shows the signal for headful DNA packaging.
Method: EM (single particle) / Resolution: 17.0 Å

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