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• W2296232359 abstract "In cyanobacteria, photoprotection from overexcitation of photochemical centers can be obtained by excitation energy dissipation at the level of the phycobilisome (PBS), the cyanobacterial antenna, induced by the orange carotenoid protein (OCP). A single photoactivated OCP bound to the core of the PBS affords almost total energy dissipation. The precise mechanism of OCP energy dissipation is yet to be fully determined, and one question is how the carotenoid can approach any core phycocyanobilin chromophore at a distance that can promote efficient energy quenching. We have performed intersubunit cross-linking using glutaraldehyde of the OCP and PBS followed by liquid chromatography coupled to tandem mass spectrometry (LC/MS-MS) to identify cross-linked residues. The only residues of the OCP that cross-link with the PBS are situated in the linker region, between the N- and C-terminal domains and a single C-terminal residue. These links have enabled us to construct a model of the site of OCP binding that differs from previous models. We suggest that the N-terminal domain of the OCP burrows tightly into the PBS while leaving the OCP C-terminal domain on the exterior of the complex. Further analysis shows that the position of the small core linker protein ApcC is shifted within the cylinder cavity, serving to stabilize the interaction between the OCP and the PBS. This is confirmed by a ΔApcC mutant. Penetration of the N-terminal domain can bring the OCP carotenoid to within 5-10 Å of core chromophores; however, alteration of the core structure may be the actual source of energy dissipation." @default.
• W2296232359 created "2016-06-24" @default.
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• W2296232359 date "2016-03-08" @default.
• W2296232359 modified "2023-10-18" @default.
• W2296232359 title "Orange carotenoid protein burrows into the phycobilisome to provide photoprotection" @default.
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• W2296232359 doi "https://doi.org/10.1073/pnas.1523680113" @default.
• W2296232359 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4812740" @default.
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• W2296232359 hasPublicationYear "2016" @default.
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