1KN1

Crystal structure of allophycocyanin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.193 

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Literature

Crystal structure of Allophycocyanin from red algae Porphyra yezoensis at 2.2 A resolution

Liu, J.Y., Jiang, T., Zhang, J.P., Liang, D.C.

(1999) J Biol Chem 274: 16945-16952

  • DOI: 10.1074/jbc.274.24.16945
  • Primary Citation of Related Structures:  
    1KN1

  • PubMed Abstract: 

    • The crystal structure of allophycocyanin from red algae Porphyra yezoensis (APC-PY) at 2.2-A resolution has been determined by the molecular replacement method. The crystal belongs to space group R32 with cell parameters a = b = 105.3 A, c = 189.4 A, alpha = beta = 90 degrees, gamma = 120 degrees ...

    The crystal structure of allophycocyanin from red algae Porphyra yezoensis (APC-PY) at 2.2-A resolution has been determined by the molecular replacement method. The crystal belongs to space group R32 with cell parameters a = b = 105.3 A, c = 189.4 A, alpha = beta = 90 degrees, gamma = 120 degrees. After several cycles of refinement using program X-PLOR and model building based on the electron density map, the crystallographic R-factor converged to 19.3% (R-free factor is 26.9%) in the range of 10.0 to 2.2 A. The r.m.s. deviations of bond length and angles are 0.015 A and 2.9 degrees, respectively. In the crystal, two APC-PY trimers associate face to face into a hexamer. The assembly of two trimers within the hexamer is similar to that of C-phycocyanin (C-PC) and R-phycoerythrin (R-PE) hexamers, but the assembly tightness of the two trimers to the hexamer is not so high as that in C-PC and R-PE hexamers. The chromophore-protein interactions and possible pathway of energy transfer were discussed. Phycocyanobilin 1alpha84 of APC-PY forms 5 hydrogen bonds with 3 residues in subunit 2beta of another monomer. In R-PE and C-PC, chromophore 1alpha84 only forms 1 hydrogen bond with 2beta77 residue in subunit 2beta. This result may support and explain great spectrum difference exists between APC trimer and monomer.

    Organizational Affiliation: 

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Chaoyang District, Beijing 100101, China.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AllophycocyaninA160Neopyropia yezoensisMutation(s): 0 
Gene Names: apcA
UniProt
Find proteins for P59856 (Neopyropia yezoensis)
Explore P59856 
Go to UniProtKB:  P59856
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP59856
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
AllophycocyaninB161Neopyropia yezoensisMutation(s): 0 
Gene Names: apcB
UniProt
Find proteins for P59857 (Neopyropia yezoensis)
Explore P59857 
Go to UniProtKB:  P59857
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP59857
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYC
Query on CYC
Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]		PHYCOCYANOBILIN
C33 H40 N4 O6
VXTXPYZGDQPMHK-GMXXPEQVSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.193 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.3α = 90
b = 105.3β = 90
c = 189.4γ = 120
Software Package:
Software NamePurpose
X-GENdata scaling
X-GENdata reduction
AMoREphasing
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-12-18
    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: 2017-10-11
    Changes: Refinement description