4LMS

Light harvesting complex PC645 from the cryptophyte Chroomonas sp. CCMP270


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.143 
  • R-Value Observed: 0.145 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Single-residue insertion switches the quaternary structure and exciton states of cryptophyte light-harvesting proteins.

Harrop, S.J.Wilk, K.E.Dinshaw, R.Collini, E.Mirkovic, T.Teng, C.Y.Oblinsky, D.G.Green, B.R.Hoef-Emden, K.Hiller, R.G.Scholes, G.D.Curmi, P.M.

(2014) Proc Natl Acad Sci U S A 111: E2666-E2675

  • DOI: https://doi.org/10.1073/pnas.1402538111
  • Primary Citation of Related Structures:  
    4LM6, 4LMS, 4LMX

  • PubMed Abstract: 

    Observation of coherent oscillations in the 2D electronic spectra (2D ES) of photosynthetic proteins has led researchers to ask whether nontrivial quantum phenomena are biologically significant. Coherent oscillations have been reported for the soluble light-harvesting phycobiliprotein (PBP) antenna isolated from cryptophyte algae. To probe the link between spectral properties and protein structure, we determined crystal structures of three PBP light-harvesting complexes isolated from different species. Each PBP is a dimer of αβ subunits in which the structure of the αβ monomer is conserved. However, we discovered two dramatically distinct quaternary conformations, one of which is specific to the genus Hemiselmis. Because of steric effects emerging from the insertion of a single amino acid, the two αβ monomers are rotated by ∼73° to an "open" configuration in contrast to the "closed" configuration of other cryptophyte PBPs. This structural change is significant for the light-harvesting function because it disrupts the strong excitonic coupling between two central chromophores in the closed form. The 2D ES show marked cross-peak oscillations assigned to electronic and vibrational coherences in the closed-form PC645. However, such features appear to be reduced, or perhaps absent, in the open structures. Thus cryptophytes have evolved a structural switch controlled by an amino acid insertion to modulate excitonic interactions and therefore the mechanisms used for light harvesting.


  • Organizational Affiliation

    School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia;


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cryptophyte phycocyanin (alpha-1 chain)80Chroomonas sp.Mutation(s): 0 
UniProt
Find proteins for U5T880 (Chroomonas sp. (strain CCMP270))
Explore U5T880 
Go to UniProtKB:  U5T880
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupU5T880
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
cryptophyte phycocyanin (beta chain)
B, D
177Chroomonas sp.Mutation(s): 0 
UniProt
Find proteins for U5T8F2 (Chroomonas sp. (strain CCMP270))
Explore U5T8F2 
Go to UniProtKB:  U5T8F2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupU5T8F2
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
cryptophyte phycocyanin (alpha-2 chain)70Chroomonas sp.Mutation(s): 0 
UniProt
Find proteins for U5T8W5 (Chroomonas sp. (strain CCMP270))
Explore U5T8W5 
Go to UniProtKB:  U5T8W5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupU5T8W5
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CYC
Query on CYC

Download Ideal Coordinates CCD File 
G [auth B],
H [auth B],
L [auth D],
M [auth D]
PHYCOCYANOBILIN
C33 H40 N4 O6
VXTXPYZGDQPMHK-GMXXPEQVSA-N
M1V
Query on M1V

Download Ideal Coordinates CCD File 
E [auth A],
J [auth C]
mesobiliverdin IX(alpha)
C33 H38 N4 O6
CXQHEXWJGZEPFP-BBROENKCSA-N
DBV
Query on DBV

Download Ideal Coordinates CCD File 
F [auth B],
K [auth D]
15,16-DIHYDROBILIVERDIN
C33 H36 N4 O6
ZQHDSLZHMAUUQK-ZTYGKHTCSA-N
P6G
Query on P6G

Download Ideal Coordinates CCD File 
I [auth B],
N [auth D]
HEXAETHYLENE GLYCOL
C12 H26 O7
IIRDTKBZINWQAW-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MEN
Query on MEN
B, D
L-PEPTIDE LINKINGC5 H10 N2 O3ASN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.143 
  • R-Value Observed: 0.145 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.958α = 90
b = 93.824β = 90
c = 121.908γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-06-18
    Type: Initial release
  • Version 1.1: 2014-07-16
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description