6pfy | pdb_00006pfy
Membrane Protein Megahertz Crystallography at the European XFEL, Photosystem I at synchrotron to 2.9 A
Structural highlights
Function[PSAF_THEEB] Probably participates in efficiency of electron transfer from plastocyanin to P700 (or cytochrome c553 in algae and cyanobacteria). This plastocyanin-docking protein contributes to the specific association of plastocyanin to PSI (By similarity). [PSAC_THEEB] Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. [PSAI_THEEB] May help in the organization of the PsaL subunit. [PSAB_THEEB] PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6. [PSAJ_THEEB] May help in the organization of the PsaE and PsaF subunits. [PSAA_THEEB] PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6. [PSAD_THEEB] PsaD can form complexes with ferredoxin and ferredoxin-oxidoreductase in photosystem I (PS I) reaction center. [PSAE_THEEB] Stabilizes the interaction between PsaC and the PSI core, assists the docking of the ferredoxin to PSI and interacts with ferredoxin-NADP oxidoreductase. Publication Abstract from PubMedThe world's first superconducting megahertz repetition rate hard X-ray free-electron laser (XFEL), the European XFEL, began operation in 2017, featuring a unique pulse train structure with 886 ns between pulses. With its rapid pulse rate, the European XFEL may alleviate some of the increasing demand for XFEL beamtime, particularly for membrane protein serial femtosecond crystallography (SFX), leveraging orders-of-magnitude faster data collection. Here, we report the first membrane protein megahertz SFX experiment, where we determined a 2.9 A-resolution SFX structure of the large membrane protein complex, Photosystem I, a > 1 MDa complex containing 36 protein subunits and 381 cofactors. We address challenges to megahertz SFX for membrane protein complexes, including growth of large quantities of crystals and the large molecular and unit cell size that influence data collection and analysis. The results imply that megahertz crystallography could have an important impact on structure determination of large protein complexes with XFELs. Membrane protein megahertz crystallography at the European XFEL.,Gisriel C, Coe J, Letrun R, Yefanov OM, Luna-Chavez C, Stander NE, Lisova S, Mariani V, Kuhn M, Aplin S, Grant TD, Dorner K, Sato T, Echelmeier A, Cruz Villarreal J, Hunter MS, Wiedorn MO, Knoska J, Mazalova V, Roy-Chowdhury S, Yang JH, Jones A, Bean R, Bielecki J, Kim Y, Mills G, Weinhausen B, Meza JD, Al-Qudami N, Bajt S, Brehm G, Botha S, Boukhelef D, Brockhauser S, Bruce BD, Coleman MA, Danilevski C, Discianno E, Dobson Z, Fangohr H, Martin-Garcia JM, Gevorkov Y, Hauf S, Hosseinizadeh A, Januschek F, Ketawala GK, Kupitz C, Maia L, Manetti M, Messerschmidt M, Michelat T, Mondal J, Ourmazd A, Previtali G, Sarrou I, Schon S, Schwander P, Shelby ML, Silenzi A, Sztuk-Dambietz J, Szuba J, Turcato M, White TA, Wrona K, Xu C, Abdellatif MH, Zook JD, Spence JCH, Chapman HN, Barty A, Kirian RA, Frank M, Ros A, Schmidt M, Fromme R, Mancuso AP, Fromme P, Zatsepin NA Nat Commun. 2019 Nov 4;10(1):5021. doi: 10.1038/s41467-019-12955-3. PMID:31685819[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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