1VYK

CRYSTAL STRUCTURE OF PSBQ PROTEIN OF PHOTOSYSTEM II FROM HIGHER PLANTS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.164 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

The 1.49 A Resolution Crystal Structure of Psbq from Photosystem II of Spinacia Oleracea Reveals a Ppii Structure in the N-Terminal Region.

Balsera, M.Arellano, J.B.Revuelta, J.L.De Las Rivas, J.Hermoso, J.A.

(2005) J Mol Biol 350: 1051

  • DOI: 10.1016/j.jmb.2005.05.044
  • Primary Citation of Related Structures:  
    1VYK

  • PubMed Abstract: 
  • We report the high-resolution structure of the spinach PsbQ protein, one of the main extrinsic proteins of higher plant photosystem II (PSII). The crystal structure shows that there are two well-defined regions in PsbQ, the C-terminal region (residues 46-149) folded as a four helix up-down bundle and the N-terminal region (residues 1-45) that is loosely packed ...

    We report the high-resolution structure of the spinach PsbQ protein, one of the main extrinsic proteins of higher plant photosystem II (PSII). The crystal structure shows that there are two well-defined regions in PsbQ, the C-terminal region (residues 46-149) folded as a four helix up-down bundle and the N-terminal region (residues 1-45) that is loosely packed. This structure provides, for the first time, insights into the crucial N-terminal region. First, two parallel beta-strands cross spatially, joining the beginning and the end of the N-terminal region of PsbQ. Secondly, the residues Pro9-Pro10-Pro11-Pro12 form a left-handed helix (or a polyproline type II (PPII) structure), which is stabilized by hydrogen bonds between the Pro peptide carbonyl groups and solvent water molecules. Thirdly, residues 14-33 are not visible in the electron density map, suggesting that this loop might be very flexible and presumably extended when PsbQ is free in solution. On the basis of the essential role of the N-terminal region of PsbQ in binding to PSII, we propose that both the PPII structure and the missing loop are key secondary structure elements in the recognition of specific protein-protein interactions between PsbQ and other oxygen-evolving complex extrinsic and/or intrinsic proteins of PSII. In addition, the PsbQ crystal coordinates two zinc ions, one of them is proposed to have a physiological role in higher plants, on the basis of the full conservation of the ligand protein residues in the sequence subfamily.


    Organizational Affiliation

    Instituto de Recursos Naturales y Agrobiología (CSIC), Cordel de Merinas 52, 37008 Salamanca, Spain.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OXYGEN-EVOLVING ENHANCER PROTEIN 3A149Spinacia oleraceaMutation(s): 0 
Gene Names: PSBQ
UniProt
Find proteins for P12301 (Spinacia oleracea)
Explore P12301 
Go to UniProtKB:  P12301
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
D [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.164 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.938α = 90
b = 49.938β = 90
c = 96.972γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-05-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-01-30
    Changes: Data collection, Experimental preparation
  • Version 1.4: 2019-02-06
    Changes: Data collection, Experimental preparation