2J96

The E-configuration of alfa-Phycoerythrocyanin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Basis for the Photochemistry of Alfa-Phycoerythrocyanin

Schmidt, M.Patel, A.Zhao, Y.Reuter, W.

(2007) Biochemistry 46: 416

  • DOI: 10.1021/bi061844j

  • PubMed Abstract: 
  • Phycobiliproteins and phytochromes are light-harvesting and light-sensing proteins containing linear tetrapyrroles, so-called bile chromophores. The chromophores in certain biliproteins, including the phytochromes, isomerize reversibly from a stable ...

    Phycobiliproteins and phytochromes are light-harvesting and light-sensing proteins containing linear tetrapyrroles, so-called bile chromophores. The chromophores in certain biliproteins, including the phytochromes, isomerize reversibly from a stable Z-configuration to a stable E-configuration when irradiated with light of the appropriate wavelength. Here, we report the crystal structure of alpha-phycoerythrocyanin with its chromophore in the E-configuration, compare it with the Z-configuration found in trimeric phycoerythrocyanin, and reveal the structural bases of the isomerization. The geometric changes of the chromophore account for the large spectral shift, which characterizes the overall transition. Interactions of the chromophore A and D pyrrole rings with flexible protein moieties are required for the formation and stabilization of the isomers. We predict that the results will hold for all photoactive biliproteins.


    Organizational Affiliation

    Physikdepartment 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, B
162Mastigocladus laminosusMutation(s): 0 
Gene Names: pccA
Find proteins for P00309 (Mastigocladus laminosus)
Go to UniProtKB:  P00309
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PVN
Query on PVN

Download SDF File 
Download CCD File 
A, B
PHYCOVIOLOBILIN
Phycoviolobilin, bound form
C33 H40 N4 O6
SYEAKBPGLNVPDH-HVONXEAXSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.235 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 129.808α = 90.00
b = 102.598β = 94.48
c = 32.146γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
BEASTphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-01-23
    Type: Initial release
  • Version 1.1: 2012-07-25
    Type: Non-polymer description, Other, Version format compliance