Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Hetero 6-mer - A3B Pseudo Symmetry: Cyclic - C3  (3D View)
Pseudo Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 107.73 kDa 
• Atom Count: 7758 
• Residue Count: 963 
• Unique protein chains: 2

4F0U

X-Ray Crystal Structure of Allophycocyanin from Synechococcus elongatus PCC 7942

• DOI: 10.2210/pdb4F0U/pdb

• Classification: PHOTOSYNTHESIS
• Organism(s): Synechococcus elongatus PCC 7942 = FACHB-805
• Mutation(s): No 


• Deposited: 2012-05-05 Released: 2013-03-06 
• Deposition Author(s): Marx, A., Adir, N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.287 
• R-Value Work: 0.235 

Literature

Allophycocyanin and phycocyanin crystal structures reveal facets of phycobilisome assembly.

Marx, A., Adir, N.

(2013) Biochim Biophys Acta 1827: 311-318

• PubMed: 23201474 
• DOI: 10.1016/j.bbabio.2012.11.006
• Structures With Same Primary Citation


• PubMed Abstract: 
  

X-ray crystal structures of the isolated phycobiliprotein components of the phycobilisome have provided high resolution details to the description of this light harvesting complex at different levels of complexity and detail. The linker-independent assembly of trimers into hexamers in crystal lattices of previously determined structures has been observed in almost all of the phycocyanin (PC) and allophycocyanin (APC) structures available in the Protein Data Bank. In this paper we describe the X-ray crystal structures of PC and APC from Synechococcus elongatus sp. PCC 7942, PC from Synechocystis sp. PCC 6803 and PC from Thermosynechococcus vulcanus crystallized in the presence of urea. All five structures are highly similar to other PC and APC structures on the levels of subunits, monomers and trimers. The Synechococcus APC forms a unique loose hexamer that may show the structural requirements for core assembly and rod attachment. While the Synechococcus PC assembles into the canonical hexamer, it does not further assemble into rods. Unlike most PC structures, the Synechocystis PC fails to form hexamers. Addition of low concentrations of urea to T. vulcanus PC inhibits this proteins propensity to form hexamers, resulting in a crystal lattice composed of trimers. The molecular source of these differences in assembly and their relevance to the phycobilisome structure is discussed.

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Organizational Affiliation: 

Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, Israel.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Allophycocyanin alpha chain	A, C, E	160	Synechococcus elongatus PCC 7942 = FACHB-805	Mutation(s): 0  Gene Names: Synpcc7942_0327
Find proteins for Q31RG0 (Synechococcus elongatus (strain PCC 7942 / FACHB-805)) Explore Q31RG0  Go to UniProtKB:  Q31RG0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Allophycocyanin, beta subunit	B, D, F	161	Synechococcus elongatus PCC 7942 = FACHB-805	Mutation(s): 0  Gene Names: Synpcc7942_0326
Find proteins for Q31RG1 (Synechococcus elongatus (strain PCC 7942 / FACHB-805)) Explore Q31RG1  Go to UniProtKB:  Q31RG1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CYC	A, B, C, D, E, F	PHYCOCYANOBILIN C33 H40 N4 O6 VXTXPYZGDQPMHK-GMXXPEQVSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MEN	B,D,F	L-PEPTIDE LINKING	C5 H10 N2 O3		ASN

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.287 
• R-Value Work: 0.235 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 99.55	α = 90
b = 165.33	β = 90
c = 151.15	γ = 90

Software Package:

Software Name	Purpose
PHASER	phasing
CNS	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-05-05 
• Released Date: 2013-03-06 
Deposition Author(s): Marx, A., Adir, N.

Revision History 

• Version 1.0: 2013-03-06
  Type: Initial release