2C7K

Laue structure of phycoerythrocyanin from Mastigocladus laminosus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Local Protein Flexibility as a Prerequisite for Reversible Chromophore Isomerization in Alpha-Phycoerythrocyanin

Schmidt, M.Krasselt, A.Reuter, W.

(2006) Biochim.Biophys.Acta 1764: 55

  • DOI: 10.1016/j.bbapap.2005.10.022
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phycoerythrocyanin is the only cyanobacterial phycobiliprotein containing phycoviolobilin as a chromophore. The phycoviolobilin chromophore is photo-reactive; upon irradiation, the chromophore undergoes a Z/E-isomerization involving the rotation of p ...

    Phycoerythrocyanin is the only cyanobacterial phycobiliprotein containing phycoviolobilin as a chromophore. The phycoviolobilin chromophore is photo-reactive; upon irradiation, the chromophore undergoes a Z/E-isomerization involving the rotation of pyrrole-ring D. We have determined the structure of trimeric phycoerythrocyanin at three different experimental settings: monochromatically at 110 K and 295 K as well as with the Laue method at 288 K. Based on their chemical structures, the restraints for the phycoviolobilin of the alpha-subunit and for the phycocyanobilin chromophores of the beta-subunit were newly generated, which allows a chemically meaningful refinement of both chromophores. All three phycoerythrocyanin structures are very similar; the subunits match within 0.5 A. The detailed comparison of the data obtained with the different measurements provided information about the protein properties around the phycoviolobilin chromophore. For the first time, crystals of a phycobilisome protein are used successfully with the Laue technique. This paves the way for time-resolved macromolecular crystallography, which is able to elucidate the exact mechanisms of the phycoviolobilin photoactivity including the protein involvement.


    Organizational Affiliation

    Physik-Department E17, Technische Universit√§t M√ľnchen, James Franck Strasse, 85747 Garching, Germany. marius.schmidt@ph.tum.de




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHYCOERYTHROCYANIN ALPHA CHAIN
A
162Mastigocladus laminosusMutation(s): 0 
Gene Names: pccA
Find proteins for P00309 (Mastigocladus laminosus)
Go to UniProtKB:  P00309
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PHYCOERYTHROCYANIN BETA CHAIN
B
172Mastigocladus laminosusMutation(s): 0 
Gene Names: pccB
Find proteins for P00313 (Mastigocladus laminosus)
Go to UniProtKB:  P00313
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYC
Query on CYC

Download SDF File 
Download CCD File 
B
PHYCOCYANOBILIN
C33 H40 N4 O6
VXTXPYZGDQPMHK-GMXXPEQVSA-N
 Ligand Interaction
BLA
Query on BLA

Download SDF File 
Download CCD File 
A
BILIVERDINE IX ALPHA
C33 H34 N4 O6
GWZYPXHJIZCRAJ-SRVCBVSDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.192 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 156.745α = 90.00
b = 156.745β = 90.00
c = 40.200γ = 120.00
Software Package:
Software NamePurpose
LAUEVIEWdata scaling
CNSrefinement
LAUEVIEWdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-01-25
    Type: Initial release