3JBB

Characterization of red-shifted phycobiliprotein complexes isolated from the chlorophyll f-containing cyanobacterium Halomicronema hongdechloris


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 26 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Characterization of red-shifted phycobilisomes isolated from the chlorophyll f-containing cyanobacterium Halomicronema hongdechloris.

Li, Y.Lin, Y.Garvey, C.J.Birch, D.Corkery, R.W.Loughlin, P.C.Scheer, H.Willows, R.D.Chen, M.

(2015) Biochim.Biophys.Acta 1857: 107-114

  • DOI: 10.1016/j.bbabio.2015.10.009

  • PubMed Abstract: 
  • Phycobilisomes are the main light-harvesting protein complexes in cyanobacteria and some algae. It is commonly accepted that these complexes only absorb green and orange light, complementing chlorophyll absorbance. Here, we present a new phycobilisom ...

    Phycobilisomes are the main light-harvesting protein complexes in cyanobacteria and some algae. It is commonly accepted that these complexes only absorb green and orange light, complementing chlorophyll absorbance. Here, we present a new phycobilisome derived complex that consists only of allophycocyanin core subunits, having red-shifted absorption peaks of 653 and 712 nm. These red-shifted phycobiliprotein complexes were isolated from the chlorophyll f-containing cyanobacterium, Halomicronema hongdechloris, grown under monochromatic 730 nm-wavelength (far-red) light. The 3D model obtained from single particle analysis reveals a double disk assembly of 120-145 Å with two α/β allophycocyanin trimers fitting into the two separated disks. They are significantly smaller than typical phycobilisomes formed from allophycocyanin subunits and core-membrane linker proteins, which fit well with a reduced distance between thylakoid membranes observed from cells grown under far-red light. Spectral analysis of the dissociated and denatured phycobiliprotein complexes grown under both these light conditions shows that the same bilin chromophore, phycocyanobilin, is exclusively used. Our findings show that red-shifted phycobilisomes are required for assisting efficient far-red light harvesting. Their discovery provides new insights into the molecular mechanisms of light harvesting under extreme conditions for photosynthesis, as well as the strategies involved in flexible chromatic acclimation to diverse light conditions.


    Related Citations: 
    • The structure of allophycocyanin B from Synechocystis PCC 6803 reveals the structural basis for the extreme redshift of the terminal emitter in phycobilisomes.
      Peng, P.P.,Dong, L.L.,Sun, Y.F.,Zeng, X.L.,Ding, W.L.,Scheer, H.,Yang, X.,Zhao, K.H.
      (2014) Acta Crystallogr.,Sect.D 70: 2558


    Organizational Affiliation

    ARC Centre of Excellence for Translational Photosynthesis and School of Biological Sciences, University of Sydney, NSW 2006, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
allophycocyanin subunit alpha-B
A, C, E, G, I, K
167Halomicronema hongdechlorisMutation(s): 0 
Find proteins for A0A0R4I959 (Halomicronema hongdechloris)
Go to UniProtKB:  A0A0R4I959
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
allophycocyanin beta chain
B, D, F, H, J, L
161Halomicronema hongdechlorisMutation(s): 0 
Find proteins for A0A0R4I960 (Halomicronema hongdechloris)
Go to UniProtKB:  A0A0R4I960
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CYC
Query on CYC

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L
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
L-PEPTIDE LINKINGC5 H10 N2 O3ASN
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 26 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-11-11
    Type: Initial release
  • Version 1.1: 2015-12-02
    Type: Database references
  • Version 1.2: 2018-07-18
    Type: Data collection