3IYI

P22 expanded head coat protein structures reveal a novel mechanism for capsid maturation: Stability without auxiliary proteins or chemical cross-links


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

P22 coat protein structures reveal a novel mechanism for capsid maturation: stability without auxiliary proteins or chemical crosslinks

Parent, K.N.Khayat, R.Tu, L.H.Suhanovsky, M.M.Cortines, J.R.Teschke, C.M.Johnson, J.E.Baker, T.S.

(2010) Structure 18: 390-401

  • DOI: 10.1016/j.str.2009.12.014
  • Primary Citation of Related Structures:  
    3IYH, 3IYI

  • PubMed Abstract: 
  • Viral capsid assembly and stability in tailed, dsDNA phage and Herpesviridae are achieved by various means including chemical crosslinks (unique to HK97), or auxiliary proteins (lambda, T4, phi29, and herpesviruses). All these viruses have coat proteins (CP) with a conserved, HK97-like core structure ...

    Viral capsid assembly and stability in tailed, dsDNA phage and Herpesviridae are achieved by various means including chemical crosslinks (unique to HK97), or auxiliary proteins (lambda, T4, phi29, and herpesviruses). All these viruses have coat proteins (CP) with a conserved, HK97-like core structure. We used a combination of trypsin digestion, gold labeling, cryo-electron microscopy, 3D image reconstruction, and comparative modeling to derive two independent, pseudoatomic models of bacteriophage P22 CP: before and after maturation. P22 capsid stabilization results from intersubunit interactions among N-terminal helices and an extensive "P loop," which obviate the need for crosslinks or auxiliary proteins. P22 CP also has a telokin-like Ig domain that likely stabilizes the monomer fold so that assembly may proceed via individual subunit addition rather than via preformed capsomers as occurs in HK97. Hence, the P22 CP structure may be a paradigm for understanding how monomers assemble in viruses like phi29 and HSV-1.


    Organizational Affiliation

    Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
P22 coat protein in procapsid shells
A, B, C, D, E, F, G
A, B, C, D, E, F, G
430Salmonella virus P22Mutation(s): 0 
Gene Names: 5
UniProt
Find proteins for P26747 (Salmonella phage P22)
Explore P26747 
Go to UniProtKB:  P26747
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP26747
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 9.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-09-05
    Changes: Derived calculations
  • Version 1.3: 2015-01-21
    Changes: Database references
  • Version 1.4: 2016-12-07
    Changes: Source and taxonomy
  • Version 1.5: 2018-07-18
    Changes: Data collection