Number of the records: 1
Energy transfer pathways in the CAC light-harvesting complex of Rhodomonas salina
- 1.
SYSNO ASEP 0536787 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Energy transfer pathways in the CAC light-harvesting complex of Rhodomonas salina Author(s) Šebelík, V. (CZ)
West, R. (CZ)
Trsková, Eliška (MBU-M)
Kaňa, Radek (MBU-M) RID, ORCID
Polívka, T. (CZ)Article number 148280 Source Title Biochimica Et Biophysica Acta-Bioenergetics. - : Elsevier - ISSN 0005-2728
Roč. 1861, č. 11 (2020)Number of pages 7 s. Language eng - English Country NL - Netherlands Keywords Peridinin ; Carotenoids ; Chlorophyll Binding Proteins Subject RIV EE - Microbiology, Virology OECD category Microbiology R&D Projects GA19-11494S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support MBU-M - RVO:61388971 UT WOS 000562511300014 EID SCOPUS 85089187774 DOI 10.1016/j.bbabio.2020.148280 Annotation Photosynthetic organisms had to evolve diverse mechanisms of light-harvesting to supply photosynthetic apparatus with enough energy. Cryptophytes represent one of the groups of photosynthetic organisms combining external and internal antenna systems. They contain one type of immobile phycobiliprotein located at the lumenal side of the thylakoid membrane, together with membrane-bound chlorophyll a/c antenna (CAC). Here we employ femtosecond transient absorption spectroscopy to study energy transfer pathways in the CAC proteins of cryptophyte Rhodomonas salina. The major CAC carotenoid, alloxanthin, is a cryptophyte-specific carotenoid, and it is the only naturally-occurring carotenoid with two triple bonds in its structure. In order to explore the energy transfer pathways within the CAC complex, three excitation wavelengths (505, 590, and 640 nm) were chosen to excite pigments in the CAC antenna. The excitation of Chl c at either 590 or 640 nm proves efficient energy transfer between Chl c and Chl a. The excitation of alloxanthin at 505 nm shows an active pathway from the S2 state with efficiency around 50%, feeding both Chl a and Chl c with approximately 1:1 branching ratio, yet, the S1-route is rather inefficient. The 57 ps energy transfer time to Chl a gives ~25% efficiency of the S1 channel. The low efficiency of the S1 route renders the overall carotenoid-Chl energy transfer efficiency low, pointing to the regulatory role of alloxanthin in the CAC antenna. Workplace Institute of Microbiology Contact Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0005272820301304
Number of the records: 1