1HX6

P3, THE MAJOR COAT PROTEIN OF THE LIPID-CONTAINING BACTERIOPHAGE PRD1.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The X-ray crystal structure of P3, the major coat protein of the lipid-containing bacteriophage PRD1, at 1.65 A resolution.

Benson, S.D.Bamford, J.K.Bamford, D.H.Burnett, R.M.

(2002) Acta Crystallogr D Biol Crystallogr 58: 39-59

  • DOI: https://doi.org/10.1107/s0907444901017279
  • Primary Citation of Related Structures:  
    1HQN, 1HX6

  • PubMed Abstract: 

    P3 has been imaged with X-ray crystallography to reveal a trimeric molecule with strikingly similar characteristics to hexon, the major coat protein of adenovirus. The structure of native P3 has now been extended to 1.65 A resolution (R(work) = 19.0% and R(free) = 20.8%). The new high-resolution model shows that P3 forms crystals through hydrophobic patches solvated by 2-methyl-2,4-pentanediol molecules. It reveals details of how the molecule's high stability may be achieved through ordered solvent in addition to intra- and intersubunit interactions. Of particular importance is a 'puddle' at the top of the molecule containing a four-layer deep hydration shell that cross-links a complex structural feature formed by 'trimerization loops'. These loops also link subunits by extending over a neighbor to reach the third subunit in the trimer. As each subunit has two eight-stranded viral jelly rolls, the trimer has a pseudo-hexagonal shape to allow close packing in its 240 hexavalent capsid positions. Flexible regions in P3 facilitate these interactions within the capsid and with the underlying membrane. A selenometh-ionine P3 derivative, with which the structure was solved, has been refined to 2.2 A resolution (R(work) = 20.1% and R(free) = 22.8%). The derivatized molecule is essentially unchanged, although synchrotron radiation has the curious effect of causing it to rotate about its threefold axis. P3 is a second example of a trimeric 'double-barrel' protein that forms a stable building block with optimal shape for constructing a large icosahedral viral capsid. A major difference is that hexon has long variable loops that distinguish different adenovirus species. The short loops in P3 and the severe constraints of its various interactions explain why the PRD1 family has highly conserved coat proteins.


  • Organizational Affiliation

    The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MAJOR CAPSID PROTEIN
A, B, C
394Enterobacteria phage PRD1Mutation(s): 0 
UniProt
Find proteins for P22535 (Enterobacteria phage PRD1)
Explore P22535 
Go to UniProtKB:  P22535
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22535
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MPD
Query on MPD

Download Ideal Coordinates CCD File 
AA [auth C]
BA [auth C]
CA [auth C]
DA [auth C]
H [auth A]
AA [auth C],
BA [auth C],
CA [auth C],
DA [auth C],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
Y [auth C],
Z [auth C]
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
D [auth A],
M [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
N [auth B]
O [auth B]
E [auth A],
F [auth A],
G [auth A],
N [auth B],
O [auth B],
P [auth B],
X [auth C]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.96α = 90
b = 121.3β = 90
c = 126.39γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-01-24
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-09
    Changes: Data collection, Database references, Derived calculations, Refinement description