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TitleThe structure and assembly mechanism of a novel three-stranded tubulin filament that centers phage DNA.
Journal, issue, pagesStructure, Vol. 22, Issue 4, Page 539-548, Year 2014
Publish dateApr 8, 2014
AuthorsElena A Zehr / James A Kraemer / Marcella L Erb / Joanna K C Coker / Elizabeth A Montabana / Joe Pogliano / David A Agard /
PubMed AbstractTubulins are a universally conserved protein superfamily that carry out diverse biological roles by assembling filaments with very different architectures. The underlying basis of this structural ...Tubulins are a universally conserved protein superfamily that carry out diverse biological roles by assembling filaments with very different architectures. The underlying basis of this structural diversity is poorly understood. Here, we determine a 7.1 Å cryo-electron microscopy reconstruction of the bacteriophage-encoded PhuZ filament and provide molecular-level insight into its cooperative assembly mechanism. The PhuZ family of tubulins is required to actively center the phage within infected host cells, facilitating efficient phage replication. Our reconstruction and derived model reveal the first example of a three-stranded tubulin filament. We show that the elongated C-terminal tail simultaneously stabilizes both longitudinal and lateral interactions, which in turn define filament architecture. Identified interaction surfaces are conserved within the PhuZ family, and their mutagenesis compromises polymerization in vitro and in vivo. Combining kinetic modeling of PhuZ filament assembly and structural data, we suggest a common filament structure and assembly mechanism for the PhuZ family of tubulins.
External linksStructure / PubMed:24631461 / PubMed Central
MethodsEM (helical sym.)
Resolution7.1 Å
Structure data

5783

3j5v

EMDB-5783: Bacteriophage-encoded Tubulin Homologue PhuZ Forms a Three-Stranded Filament
PDB-3j5v: PhuZ201 filament
Method: EM (helical sym.) / Resolution: 7.1 Å

Chemicals

ChemComp-GDP:
GUANOSINE-5'-DIPHOSPHATE / GDP, energy-carrying molecule*YM / Guanosine diphosphate

ChemComp-MG:
Unknown entry

Source
  • pseudomonas phage 201phi2-1 (virus)
KeywordsVIRAL PROTEIN / PhuZ / tubulin / FtsZ / filament / bacteriophage / cytoskeleton / bacteriophage centering function

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