4R6L

Crystal structure of bacteriophytochrome RpBphP2 from photosynthetic bacterium R. palustris


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.322 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.270 

wwPDB Validation 3D Report Full Report



Literature

Light Signaling Mechanism of Two Tandem Bacteriophytochromes.

Yang, X.Stojkovic, E.A.Ozarowski, W.B.Kuk, J.Davydova, E.Moffat, K.

(2015) Structure 23: 1179-1189

  • DOI: 10.1016/j.str.2015.04.022
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • RpBphP2 and RpBphP3, two tandem bacteriophytochromes from the photosynthetic bacterium Rhodopseudomonas palustris, share high sequence identity but exhibit distinct photoconversion behavior. Unlike the canonical RpBphP2, RpBphP3 photoconverts to an u ...

    RpBphP2 and RpBphP3, two tandem bacteriophytochromes from the photosynthetic bacterium Rhodopseudomonas palustris, share high sequence identity but exhibit distinct photoconversion behavior. Unlike the canonical RpBphP2, RpBphP3 photoconverts to an unusual near-red-absorbing (Pnr) state; both are required for synthesis of light-harvesting complexes under low-light conditions. Here we report the crystal structures of the photosensory core modules of RpBphP2 and RpBphP3. Despite different quaternary structures, RpBphP2 and RpBphP3 adopt nearly identical tertiary structures. The RpBphP3 structure reveals tongue-and-groove interactions at the interface between the GAF and PHY domains. A single mutation in the PRxSF motif at the GAF-PHY interface abolishes light-induced formation of the Pnr state in RpBphP3, possibly due to altered structural rigidity of the chromophore-binding pocket. Structural comparisons suggest that long-range signaling involves structural rearrangement of the helical spine at the dimer interface. These structures, together with mutational studies, provide insights into photoconversion and the long-range signaling mechanism in phytochromes.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA; Institute for Biophysical Dynamics, University of Chicago, Chicago, IL 60637, USA. Electronic address: moffat@cars.uchicago.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bacteriophytochrome (Light-regulated signal transduction histidine kinase), PhyB1
A, B
519Rhodopseudomonas palustris CGA009Mutation(s): 0 
Gene Names: phyB1RPA3015
Find proteins for Q6N5G3 (Rhodopseudomonas palustris (strain ATCC BAA-98 / CGA009))
Go to UniProtKB:  Q6N5G3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BLA
Query on BLA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.322 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.270 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 174.396α = 90
b = 174.396β = 90
c = 95.672γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-22
    Type: Initial release