TY - JOUR
T1 - Regulating the Energy Flow in a Cyanobacterial Light-Harvesting Antenna Complex
AU - Eisenberg, Ido
AU - Caycedo-Soler, Felipe
AU - Harris, Dvir
AU - Yochelis, Shira
AU - Huelga, Susana F.
AU - Plenio, Martin B.
AU - Adir, Noam
AU - Keren, Nir
AU - Paltiel, Yossi
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/2/16
Y1 - 2017/2/16
N2 - Photosynthetic organisms harvest light energy, utilizing the absorption and energy-transfer properties of protein-bound chromophores. Controlling the harvesting efficiency is critical for the optimal function of the photosynthetic apparatus. Here, we show that the cyanobacterial light-harvesting antenna complex may be able to regulate the flow of energy to switch reversibly from efficient energy conversion to photoprotective quenching via a structural change. We isolated cyanobacterial light-harvesting proteins, phycocyanin and allophycocyanin, and measured their optical properties in solution and in an aggregated-desiccated state. The results indicate that energy band structures are changed, generating a switch between the two modes of operation, exciton transfer and quenching, achieved without dedicated carotenoid quenchers. This flexibility can contribute greatly to the large dynamic range of cyanobacterial light-harvesting systems. (Figure Presented).
AB - Photosynthetic organisms harvest light energy, utilizing the absorption and energy-transfer properties of protein-bound chromophores. Controlling the harvesting efficiency is critical for the optimal function of the photosynthetic apparatus. Here, we show that the cyanobacterial light-harvesting antenna complex may be able to regulate the flow of energy to switch reversibly from efficient energy conversion to photoprotective quenching via a structural change. We isolated cyanobacterial light-harvesting proteins, phycocyanin and allophycocyanin, and measured their optical properties in solution and in an aggregated-desiccated state. The results indicate that energy band structures are changed, generating a switch between the two modes of operation, exciton transfer and quenching, achieved without dedicated carotenoid quenchers. This flexibility can contribute greatly to the large dynamic range of cyanobacterial light-harvesting systems. (Figure Presented).
UR - http://www.scopus.com/inward/record.url?scp=85014329740&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.6b10590
DO - 10.1021/acs.jpcb.6b10590
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C2 - 28121148
AN - SCOPUS:85014329740
SN - 1520-6106
VL - 121
SP - 1240
EP - 1247
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 6
ER -