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TitleInsight into DNA and protein transport in double-stranded DNA viruses: the structure of bacteriophage N4.
Journal, issue, pagesJ Mol Biol, Vol. 378, Issue 3, Page 726-736, Year 2008
Publish dateMay 2, 2008
AuthorsKyung H Choi / Jennifer McPartland / Irene Kaganman / Valorie D Bowman / Lucia B Rothman-Denes / Michael G Rossmann /
PubMed AbstractBacteriophage N4 encapsidates a 3500-aa-long DNA-dependent RNA polymerase (vRNAP), which is injected into the host along with the N4 genome upon infection. The three-dimensional structures of wild- ...Bacteriophage N4 encapsidates a 3500-aa-long DNA-dependent RNA polymerase (vRNAP), which is injected into the host along with the N4 genome upon infection. The three-dimensional structures of wild-type and mutant N4 viruses lacking gp17, gp50, or gp65 were determined by cryoelectron microscopy. The virion has an icosahedral capsid with T=9 quasi-symmetry that encapsidates well-organized double-stranded DNA and vRNAP. The tail, attached at a unique pentameric vertex of the head, consists of a neck, 12 appendages, and six ribbons that constitute a non-contractile sheath around a central tail tube. Comparison of wild-type and mutant virus structures in conjunction with bioinformatics established the identity and virion locations of the major capsid protein (gp56), a decorating protein (gp17), the vRNAP (gp50), the tail sheath (gp65), the appendages (gp66), and the portal protein (gp59). The N4 virion organization provides insight into its assembly and suggests a mechanism for genome and vRNAP transport strategies utilized by this unique system.
External linksJ Mol Biol / PubMed:18374942 / PubMed Central
MethodsEM (single particle)
Resolution14.0 - 30.0 Å
Structure data

EMDB-1472:
Structure of bacteriophage N4 wild-type and mutants, determined by cryo-electron microscopy.
Method: EM (single particle) / Resolution: 14.0 Å

EMDB-1475:
Structure of bacteriophage N4
Method: EM (single particle) / Resolution: 29.0 Å

EMDB-1476:
Structure of a bacteriophage N4 mutant lacking gp65
Method: EM (single particle) / Resolution: 30.0 Å

EMDB-1509:
Structure of a bacteriophage N4 mutant lacking gp17
Method: EM (single particle) / Resolution: 15.0 Å

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