1HA7

STRUCTURE OF A LIGHT-HARVESTING PHYCOBILIPROTEIN, C-PHYCOCYANIN FROM SPIRULINA PLATENSIS AT 2.2A RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of a Light-Harvesting Protein C-Phycocyanin from Spirulina Platensis

Padyana, A.K.Bhat, V.B.Madyastha, K.M.Rajashankar, K.R.Ramakumar, S.

(2001) Biochem.Biophys.Res.Commun. 282: 893

  • DOI: 10.1006/bbrc.2001.4663

  • PubMed Abstract: 
  • The crystal structure of C-phycocyanin, a light-harvesting phycobiliprotein from cyanobacteria (blue-green algae) Spirulina platensis has been solved by molecular replacement technique. The crystals belong to space group P2(1) with cell parameters a ...

    The crystal structure of C-phycocyanin, a light-harvesting phycobiliprotein from cyanobacteria (blue-green algae) Spirulina platensis has been solved by molecular replacement technique. The crystals belong to space group P2(1) with cell parameters a = 107.20, b = 115.40, c = 183.04 A; beta = 90.2 degrees. The structure has been refined to a crystallographic R factor of 19.2% (R(free) = 23.9%) using the X-ray diffraction data extending up to 2.2 A resolution. The asymmetric unit of the crystal cell consists of two (alphabeta)6-hexamers, each hexamer being the functional unit in the native antenna rod of cyanobacteria. The molecular structure resembles that of other reported C-phycocyanins. However, the unique form of aggregation of two (alphabeta)6-hexamers in the crystal asymmetric unit, suggests additional pathways of energy transfer in lateral direction between the adjacent hexamers involving beta155 phycocyanobilin chromophores.


    Related Citations: 
    • Crystal Structure of C-Phycocyanin from Cyanidium Caldarium Provides a New Perspective on Phycobilisome Assembly
      Stec, B.,Troxler, R.F.,Teeter, M.M.
      (1999) Biophys.J. 76: 2912
    • Isolation, Crystallization, Crystal Structure Analysis and Refinement of Constitutive C-Phycocyanin from the Chromatically Adapting Cyanobacterium Fremyella Diplosiphon at 1.66 Angstrom Resolution
      Duerring, M.,Schmidt, G.B.,Huber, R.
      (1991) J.Mol.Biol. 217: 577


    Organizational Affiliation

    Department of Physics, Indian Institute of Science, Bangalore, 560 012, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
C-PHYCOCYANIN ALPHA CHAIN
A, C, E, G, I, K, M, O, Q, S, U, W
162Arthrospira platensisGene Names: cpcA
Find proteins for P72509 (Arthrospira platensis)
Go to UniProtKB:  P72509
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
C-PHYCOCYANIN BETA CHAIN
B, D, F, H, J, L, N, P, R, T, V, X
172Arthrospira platensisGene Names: cpcB
Find proteins for P72508 (Arthrospira platensis)
Go to UniProtKB:  P72508
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYC
Query on CYC

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X
PHYCOCYANOBILIN
C33 H40 N4 O6
VXTXPYZGDQPMHK-GMXXPEQVSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MEN
Query on MEN
B, D, F, H, J, L, N, P, R, T, V, X
L-PEPTIDE LINKINGC5 H10 N2 O3ASN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 107.200α = 90.00
b = 115.400β = 90.21
c = 183.040γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-03-28
    Type: Initial release
  • Version 1.1: 2011-05-07
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance