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Pubmed ID :25006873
Publication Date : //

Taking snapshots of photosynthetic water oxidation using femtosecond X-ray diffraction and spectroscopy.


The dioxygen we breathe is formed by light-induced oxidation of water in photosystem II. O2 formation takes place at a catalytic manganese cluster within milliseconds after the photosystem II reaction centre is excited by three single-turnover flashes. Here we present combined X-ray emission spectra and diffraction data of 2-flash (2F) and 3-flash (3F) photosystem II samples, and of a transient 3F' state (250 μs after the third flash), collected under functional conditions using an X-ray free electron laser. The spectra show that the initial O-O bond formation, coupled to Mn reduction, does not yet occur within 250 μs after the third flash. Diffraction data of all states studied exhibit an anomalous scattering signal from Mn but show no significant structural changes at the present resolution of 4.5 Å. This study represents the initial frames in a molecular movie of the structural changes during the catalytic reaction in photosystem II.

Authors : Kern Jan , Tran Rosalie , Alonso-Mori Roberto , Koroidov Sergey , Echols Nathaniel , Hattne Johan , Ibrahim Mohamed , Gul Sheraz , Laksmono Hartawan , Sierra Raymond G , Gildea Richard J , Han Guangye , Hellmich Julia , Lassalle-Kaiser Benedikt , Chatterjee Ruchira , Brewster Aaron S , Stan Claudiu A , Glöckner Carina , Lampe Alyssa , DiFiore Dörte , Milathianaki Despina , Fry Alan R , Seibert M Marvin , Koglin Jason E , Gallo Erik , Uhlig Jens , Sokaras Dimosthenis , Weng Tsu-Chien , Zwart Petrus H , Skinner David E , Bogan Michael J , Messerschmidt Marc , Glatzel Pieter , Williams Garth J , Boutet Sébastien , Adams Paul D , Zouni Athina , Messinger Johannes , Sauter Nicholas K , Bergmann Uwe , Yano Junko , Yachandra Vittal K ,

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