Crystal Structure of the Bacteriophage phi29 gene product 12 N-terminal fragment in complex with 2-(N-cyclohexylamino)ethane sulfonic acid (CHES)

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Crystallographic insights into the autocatalytic assembly mechanism of a bacteriophage tail spike.

Xiang, Y.Leiman, P.G.Li, L.Grimes, S.Anderson, D.L.Rossmann, M.G.

(2009) Mol Cell 34: 375-386

  • DOI: https://doi.org/10.1016/j.molcel.2009.04.009
  • Primary Citation of Related Structures:  
    3GQ7, 3GQ8, 3GQ9, 3GQA, 3GQH, 3GQK, 3SUC

  • PubMed Abstract: 

    The tailed bacteriophage phi29 has 12 "appendages" (gene product 12, gp12) attached to its neck region that participate in host cell recognition and entry. In the cell, monomeric gp12 undergoes proteolytic processing that releases the C-terminal domain during assembly into trimers. We report here crystal structures of the protein before and after catalytic processing and show that the C-terminal domain of gp12 is an "autochaperone" that aids trimerization. We also show that autocleavage of the C-terminal domain is a posttrimerization event that is followed by a unique ATP-dependent release. The posttranslationally modified N-terminal part has three domains that function to attach the appendages to the phage, digest the cell wall teichoic acids, and bind irreversibly to the host, respectively. Structural and sequence comparisons suggest that some eukaryotic and bacterial viruses as well as bacterial adhesins might have a similar maturation mechanism as is performed by phi29 gp12 for Bacillus subtilis.

  • Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Preneck appendage protein609Salasvirus phi29Mutation(s): 0 
Gene Names: 12gene product 12
Find proteins for P20345 (Bacillus phage phi29)
Explore P20345 
Go to UniProtKB:  P20345
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20345
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.841α = 90
b = 90.841β = 90
c = 586.952γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-03-21
    Changes: Database references
  • Version 1.3: 2017-11-01
    Changes: Refinement description
  • Version 1.4: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description