3LS1

Crystal Structure of Cyanobacterial PsbQ from Synechocystis sp. PCC 6803 complexed with Zn2+

• PDB DOI: https://doi.org/10.2210/pdb3LS1/pdb

• Classification: PHOTOSYNTHESIS
• Organism(s): Synechocystis sp. PCC 6803
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2010-02-12 Released: 2010-03-31 
• Deposition Author(s): Jackson, S.A., Fagerlund, R.D., Wilbanks, S.M., Eaton-Rye, J.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.218 
• R-Value Work: 0.179 
• R-Value Observed: 0.181 

Literature

Crystal Structure of PsbQ from Synechocystis sp. PCC 6803 at 1.8 A: Implications for Binding and Function in Cyanobacterial Photosystem II

Jackson, S.A., Fagerlund, R.D., Wilbanks, S.M., Eaton-Rye, J.J.

(2010) Biochemistry 49: 2765-2767

• PubMed: 20210304 
• DOI: https://doi.org/10.1021/bi100217h
• Primary Citation of Related Structures:  
  3LS0, 3LS1


• PubMed Abstract: 
  

  In Synechocystis sp. PCC 6803, PsbQ is associated with photosystem II (PSII) complexes with the highest activity and stability. However, this subunit is not found in PSII X-ray crystallographic structures from Thermosynechococcus elongatus or Thermosynechococcus vulcanus. We present the crystal structure of cyanobacterial PsbQ determined in the presence and absence of Zn(2+). The protein has a well-defined helical core, containing four helices arranged in an up-down-up-down fold. A conserved potential interaction site composed of a divalent metal binding site and adjacent hydrophobic pocket has been identified.

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Organizational Affiliation: 

Department of Biochemistry, University of Otago, Dunedin 9054, New Zealand.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29.48 kDa 
• Atom Count: 2,315 
• Modelled Residue Count: 266 
• Deposited Residue Count: 266 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sll1638 protein	A, B	133	Synechocystis sp. PCC 6803	Mutation(s): 0  Gene Names: sll1638
UniProt
Find proteins for P73048 (Synechocystis sp. (strain PCC 6803 / Kazusa)) Explore P73048  Go to UniProtKB:  P73048

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth A], D [auth A], E [auth B], F [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.218 
• R-Value Work: 0.179 
• R-Value Observed: 0.181 
• Space Group: I 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 92.771	α = 90
b = 29.03	β = 97.77
c = 99.503	γ = 90

Software Package:

Software Name	Purpose
SCALA	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-03-31 
Deposition Author(s): Jackson, S.A., Fagerlund, R.D., Wilbanks, S.M., Eaton-Rye, J.J.

Revision History  

• Version 1.0: 2010-03-31
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-11-01
  Changes: Data collection, Database references, Derived calculations, Refinement description