Deletion of the short N‐terminal extension in OCP reveals the main site for FRP binding. Issue 12 (1st June 2017)

• Record Type: Journal Article
• Authors: Sluchanko, Nikolai N.; Slonimskiy, Yury B.; Moldenhauer, Marcus; Friedrich, Thomas; Maksimov, Eugene G.
• Is Part Of: FEBS letters. Volume 591:Issue 12(2017)
• Page Start: 1667
• Page End: 1676
• Publication Date: 2017-06-01
• Subjects: fluorescence recovery protein -- orange carotenoid protein -- photoactive proteins -- photoprotection -- phycobilisome fluorescence -- protein–protein interactions; Biochemistry -- Periodicals; Biophysics -- Periodicals; Molecular biology -- Periodicals; Biochimie -- Périodiques; Biochemistry; Biophysics; Molecular biology; Periodicals; 572.05
• DOI: 10.1002/1873-3468.12680
• Languages: English
• ISSNs: 0014-5793

Abstract

Abstract : The orange carotenoid protein (OCP) plays a key role in cyanobacterial photoprotection. Photoconversion entails structural rearrangements in OCP that are required for its binding to phycobilisome, thereby inducing excitation energy dissipation. Detachment of OCP from phycobilisome requires the fluorescence recovery protein (FRP). It is considered that OCP interacts with FRP only in the photoactivated state; however, the binding site for FRP is currently unknown. As an important stabilizing element in orange OCP, the short αA‐helix within the N‐terminal extension (NTE) binds to the C‐terminal domain (CTD), but unfolds upon photoactivation and interferes with phycobilisome binding. Here, we demonstrate that the NTE shares specific structural and functional similarities with FRP and discover the main site of OCP‐FRP interactions in the OCP‐CTD. Abstract :