4LMX

Light harvesting complex PE555 from the cryptophyte Hemiselmis andersenii CCMP644


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.161 

Starting Model: experimental
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Ligand Structure Quality Assessment 


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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
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cryptophyte phycoerythrin (alpha-2 chain)62Hemiselmis anderseniiMutation(s): 0 
UniProt
Find proteins for U5TBJ3 (Hemiselmis andersenii)
Explore U5TBJ3 
Go to UniProtKB:  U5TBJ3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupU5TBJ3
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
cryptophyte phycoerythrin (beta chain)
B, D, F, H, J
B, D, F, H, J, L
177Hemiselmis anderseniiMutation(s): 0 
UniProt
Find proteins for U5T8W0 (Hemiselmis andersenii)
Explore U5T8W0 
Go to UniProtKB:  U5T8W0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupU5T8W0
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
cryptophyte phycoerythrin (alpha-1 chain)67Hemiselmis anderseniiMutation(s): 0 
UniProt
Find proteins for U5TBU5 (Hemiselmis andersenii)
Explore U5TBU5 
Go to UniProtKB:  U5TBU5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupU5TBU5
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
cryptophyte phycoerythrin (alpha-1/alpha-2 chain)
E, G, I, K
67Hemiselmis anderseniiMutation(s): 7 
UniProt
Find proteins for U5TBJ3 (Hemiselmis andersenii)
Explore U5TBJ3 
Go to UniProtKB:  U5TBJ3
Entity Groups  
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UniProt GroupU5TBJ3
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PEB
Query on PEB

Download Ideal Coordinates CCD File 
AA [auth H]
BA [auth H]
CA [auth I]
EA [auth J]
FA [auth J]
AA [auth H],
BA [auth H],
CA [auth I],
EA [auth J],
FA [auth J],
GA [auth K],
IA [auth L],
JA [auth L],
M [auth A],
O [auth B],
P [auth B],
Q [auth C],
S [auth D],
T [auth D],
U [auth E],
W [auth F],
X [auth F],
Y [auth G]
PHYCOERYTHROBILIN
C33 H40 N4 O6
NKCBCVIFPXGHAV-WAVSMFBNSA-N
DBV
Query on DBV

Download Ideal Coordinates CCD File 
DA [auth J]
HA [auth L]
N [auth B]
R [auth D]
V [auth F]
DA [auth J],
HA [auth L],
N [auth B],
R [auth D],
V [auth F],
Z [auth H]
15,16-DIHYDROBILIVERDIN
C33 H36 N4 O6
ZQHDSLZHMAUUQK-ZTYGKHTCSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
LYZ
Query on LYZ
A
L-PEPTIDE LINKINGC6 H14 N2 O3LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.161 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.073α = 90
b = 76.741β = 92.86
c = 142.593γ = 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: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description