6T6M

Y201W mutant of the orange carotenoid protein from Synechocystis at pH 5.5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.167 
  • R-Value Work: 0.128 
  • R-Value Observed: 0.130 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Role of hydrogen bond alternation and charge transfer states in photoactivation of the Orange Carotenoid Protein.

Yaroshevich, I.A.Maksimov, E.G.Sluchanko, N.N.Zlenko, D.V.Stepanov, A.V.Slutskaya, E.A.Slonimskiy, Y.B.Botnarevskii, V.S.Remeeva, A.Gushchin, I.Kovalev, K.Gordeliy, V.I.Shelaev, I.V.Gostev, F.E.Khakhulin, D.Poddubnyy, V.V.Gostev, T.S.Cherepanov, D.A.Polivka, T.Kloz, M.Friedrich, T.Paschenko, V.Z.Nadtochenko, V.A.Rubin, A.B.Kirpichnikov, M.P.

(2021) Commun Biol 4: 539-539

  • DOI: https://doi.org/10.1038/s42003-021-02022-3
  • Primary Citation of Related Structures:  
    6T6K, 6T6M, 6T6O

  • PubMed Abstract: 

    Here, we propose a possible photoactivation mechanism of a 35-kDa blue light-triggered photoreceptor, the Orange Carotenoid Protein (OCP), suggesting that the reaction involves the transient formation of a protonated ketocarotenoid (oxocarbenium cation) state. Taking advantage of engineering an OCP variant carrying the Y201W mutation, which shows superior spectroscopic and structural properties, it is shown that the presence of Trp201 augments the impact of one critical H-bond between the ketocarotenoid and the protein. This confers an unprecedented homogeneity of the dark-adapted OCP state and substantially increases the yield of the excited photoproduct S*, which is important for the productive photocycle to proceed. A 1.37 Å crystal structure of OCP Y201W combined with femtosecond time-resolved absorption spectroscopy, kinetic analysis, and deconvolution of the spectral intermediates, as well as extensive quantum chemical calculations incorporating the effect of the local electric field, highlighted the role of charge-transfer states during OCP photoconversion.


  • Organizational Affiliation

    Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Orange carotenoid-binding protein332Synechocystis sp. PCC 6803Mutation(s): 1 
Gene Names: slr1963
UniProt
Find proteins for P74102 (Synechocystis sp. (strain ATCC 27184 / PCC 6803 / Kazusa))
Explore P74102 
Go to UniProtKB:  P74102
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP74102
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.167 
  • R-Value Work: 0.128 
  • R-Value Observed: 0.130 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.149α = 90
b = 83.149β = 90
c = 87.488γ = 120
Software Package:
Software NamePurpose
Aimlessdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Russian Foundation for Basic ResearchRussian Federation18-04-00691

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-18
    Type: Initial release
  • Version 1.1: 2021-12-29
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Refinement description