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  • Title: Structure of spheroidene in the photosynthetic reaction center from Y Rhodobacter sphaeroides.
    Author: Arnoux B, Ducruix A, Reiss-Husson F, Lutz M, Norris J, Schiffer M, Chang CH.
    Journal: FEBS Lett; 1989 Nov 20; 258(1):47-50. PubMed ID: 2687022.
    Abstract:
    The structure of the reaction center of Y Rhodobacter sphaeroides has been solved at 3 A resolution, using the atomic coordinates of the reaction center from the carotenoidless mutant R26 Rhodobacter sphaeroides. The structure has been refined by a stimulated annealing with the computer program X-PLOR, leading to a crystallographic R factor of 0.22 using reflections between 8 and 3 A. The spheroidene molecule which is bound to the Y reaction center has been fitted in the electron density map as a 15-cis isomer with a highly asymmetric structure. The cis-bond is located at proximity from ring 1 of the accessory bacteriochlorophyll on the inactive M side. The nature of the cis-bond was confirmed by resonance Raman spectra obtained from Y reaction center crystals. The structure of spheroidene in Y reaction center is compared to that proposed for 1,2-dihydroneurosporene in Rhodopseudomonas viridis reaction center crystals.
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