A Molecular Mechanism for Nonphotochemical Quenching in Cyanobacteria.
A Molecular Mechanism for Nonphotochemical Quenching in Cyanobacteria.
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DOI:
10.1021/acs.biochem.7b00202
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发表时间:
2017-06-06
期刊:
影响因子:
2.9
通讯作者:
Blankenship RE
中科院分区:
文献类型:
--
作者:
Lu Y;Liu H;Saer R;Li VL;Zhang H;Shi L;Goodson C;Gross ML;Blankenship RE
The cyanobacterial Orange Carotenoid Protein (OCP) protects photosynthetic cyanobacteria from photodamage by dissipating excess excitation energy collected by phycobilisomes (PBS) as heat. Dissociation of the PBS-OCP complex in vivo is facilitated by another protein known as the Fluorescence Recovery Protein (FRP), which primarily exists as a dimeric complex. We used various mass spectrometry(MS)-based techniques to investigate the molecular mechanism of this FRP-mediated process. FRP in the dimeric state (dFRP) retains its high affinity to the C-terminal domain (CTD) of OCP in the red state (OCPr). Site-directed mutagenesis and native MS suggest the head region on FRP is a binding candidate to OCP. After attachment to the CTD, the conformational changes of dFRP enable dFRP to bridge the two domains, facilitating the reversion of OCPr into the orange state (OCPo) accompanied by a structural rearrangement of dFRP. Interestingly, we found a mutual response between FRP and OCP; that is, FRP and OCPr destabilize each other, whereas FRP and OCPo stabilize each other. A detailed mechanism of FRP function is proposed on the basis of the experimental results.
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影响因子:
3.1
作者:
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通讯作者:
Kerfeld, Cheryl A.
影响因子:
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Lu, Yue;Zhang, Hao;Niedzwiedzki, Dariusz M.;Jiang, Jing;Blankenship, Robert E.;Gross, Michael L.
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影响因子:
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通讯作者:
Kerfeld, Cheryl A.
影响因子:
2.9
作者:
Lu, Yue;Liu, Haijun;Blankenship, Robert E.
通讯作者:
Blankenship, Robert E.