2KOI

Refined solution structure of a cyanobacterial phytochrome GAF domain in the red light-absorbing ground state


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the photoconversion of a phytochrome to the activated Pfr form

Ulijasz, A.T.Cornilescu, G.Cornilescu, C.C.Zhang, J.Rivera, M.Markley, J.L.Vierstra, R.D.

(2010) Nature 463: 250-254

  • DOI: 10.1038/nature08671
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phytochromes are a collection of bilin-containing photoreceptors that regulate numerous photoresponses in plants and microorganisms through their ability to photointerconvert between a red-light-absorbing, ground state (Pr) and a far-red-light-absorb ...

    Phytochromes are a collection of bilin-containing photoreceptors that regulate numerous photoresponses in plants and microorganisms through their ability to photointerconvert between a red-light-absorbing, ground state (Pr) and a far-red-light-absorbing, photoactivated state (Pfr). Although the structures of several phytochromes as Pr have been determined, little is known about the structure of Pfr and how it initiates signalling. Here we describe the three-dimensional solution structure of the bilin-binding domain as Pfr, using the cyanobacterial phytochrome from Synechococcus OSB'. Contrary to predictions, light-induced rotation of the A pyrrole ring but not the D ring is the primary motion of the chromophore during photoconversion. Subsequent rearrangements within the protein then affect intradomain and interdomain contact sites within the phytochrome dimer. On the basis of our models, we propose that phytochromes act by propagating reversible light-driven conformational changes in the bilin to altered contacts between the adjacent output domains, which in most phytochromes direct differential phosphotransfer.


    Related Citations: 
    • Solution structure of a cyanobacterial phytochrome GAF domain in the red-light-absorbing ground state
      Cornilescu, G.,Ulijasz, A.T.,Cornilescu, C.C.,Markley, J.L.,Vierstra, R.D.
      (2008) J.Mol.Biol. 383: 403


    Organizational Affiliation

    Department of Genetics and, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sensor protein
A
172Synechococcus sp. (strain JA-2-3B'a(2-13))
Find proteins for Q2JIZ5 (Synechococcus sp. (strain JA-2-3B'a(2-13)))
Go to UniProtKB:  Q2JIZ5
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYC
Query on CYC

Download SDF File 
Download CCD File 
A
PHYCOCYANOBILIN
C33 H40 N4 O6
VXTXPYZGDQPMHK-GMXXPEQVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2KOI Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-11-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Source and taxonomy, Version format compliance