Structural rearrangements in the C-terminal domain homolog of Orange Carotenoid Protein are crucial for carotenoid transfer

Dvir, H.; Adjele, W.; Fernando, M.; Sluchanko, N.N.; Thomas, F.; Maksimov, E.G.; Diana, K.; Noam, A.

Авторы: Dvir Harris, Adjele Wilson, Fernando Muzzopappa, Sluchanko Nikolai N., Thomas Friedrich, Maksimov Eugene G., Diana Kirilovsky, Noam Adir
Журнал: Communications Biology
Год издания: 2018
Издательство: Springer Nature
Местоположение издательства: Switzerland
DOI: 10.1038/s42003-018-0132-5
Аннотация: A recently reported family of soluble cyanobacterial carotenoproteins, homologs of the C-terminal domain (CTDH) of the photoprotective Orange Carotenoid Protein, is suggested to mediate carotenoid transfer from the thylakoid membrane to the Helical Carotenoid Proteins, which are paralogs of the N-terminal domain of the OCP. Here we present the three-dimensional structure of a carotenoid-free CTDH variant from Anabaena (Nostoc) PCC 7120. This CTDH contains a cysteine residue at position 103. Two dimer-forming interfaces were identified, one stabilized by a disulfide bond between monomers and the second between each monomer’s β-sheets, both compatible with small-angle X-ray scattering data and likely representing intermediates of carotenoid transfer processes. The crystal structure revealed a major positional change of the C-terminal tail. Further mutational analysis revealed the importance of the C-terminal tail in both carotenoid uptake and delivery. These results have allowed us to suggest a detailed model for carotenoid transfer via these soluble proteins.
Добавил в систему: Максимов Евгений Георгиевич

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Structural rearrangements in the C-terminal domain homolog of Orange Carotenoid Protein are crucial for carotenoid transferстатья Исследовательская статья

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