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A comparative study of three signaling forms of the orange carotenoid protein

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Abstract

Orange carotenoid protein (OCP) is a water-soluble photoactive protein responsible for a photoprotective mechanism of nonphotochemical quenching in cyanobacteria. Under blue–green illumination, OCP converts from the stable orange into the signaling red quenching form; however, the latter form could also be obtained by chemical activation with high concentrations of sodium thiocyanate (NaSCN) or point mutations. In this work, we show that a single replacement of tryptophan-288, normally involved in protein-chromophore interactions, by alanine, results in formation of a new protein form, hereinafter referred to as purple carotenoid protein (PCP). Comparison of resonance Raman spectra of the native photoactivated red form, chemically activated OCP, and PCP reveals that carotenoid conformation is sensitive to the structure of the C-domain, implicating that the chromophore retains some interactions with this part of the protein in the active red form. Combination of differential scanning fluorimetry and picosecond time-resolved fluorescence anisotropy measurements allowed us to compare the stability of different OCP forms and to estimate relative differences in protein rotation rates. These results were corroborated by hydrodynamic analysis of proteins by dynamic light scattering and analytical size-exclusion chromatography, indicating that the light-induced conversion of the protein is accompanied by a significant increase in its size. On the whole, our data support the idea that the red form of OCP is a molten globule-like protein in which, however, interactions between the carotenoid and the C-terminal domain are preserved.

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Abbreviations

OCPO :

Orange carotenoid protein—orange form

OCPR :

Orange carotenoid protein—red form

PCP:

Purple Carotenoid Protein (W288A-OCP)

RCP:

Red Carotenoid Protein

ECN:

Echinenone

NPQ:

Non-photochemical quenching

τ :

Fluorescence lifetime

φ fl :

Fluorescence quantum yield

r :

Anisotropy

θ :

Correlation time

NR:

Nile red

SEC:

Size-exclusion chromatography

DSF:

Differential scanning fluorimetry

DLS:

Dynamic light scattering

HOOP:

Hydrogen-out-of-plane

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Acknowledgments

V.Z.P. and E.G.M. thank the Russian Foundation for Basic Research (Projects Nos. 14-04-01536A and 15-04-01930A) for partial support of this work. E.A.S. and E.G.M. thank the Russian Scientific Foundation (Project 14-17-00451) for partial support of this work. E.G.M., G.V.T., and K.E.K. thank the Russian Ministry of Education and Science (Project MK-5949.2015.4) for partial support of this work. This work was supported, in part by a Dynasty Foundation Fellowship to E.G.M. The reported study was funded by RFBR and Moscow city Government according to the research Project No. 15-34-70007 «mol_a_mos» . T.F., F.-J.S, N.N.T., M.W., and M.M gratefully acknowledge support from the Stifterverband für die Deutsche Wissenschaft (Study reform Project “OPLChem”) and the German Research Foundation (DFG, Cluster of Excellence “Unifying Concepts in Catalysis”).

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Maksimov, E.G., Moldenhauer, M., Shirshin, E.A. et al. A comparative study of three signaling forms of the orange carotenoid protein. Photosynth Res 130, 389–401 (2016). https://doi.org/10.1007/s11120-016-0272-8

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