9f9c

Laser excitation effects on BR: Reprocessed Extrapolated 16 ns Light dataset recorded at 0.04 GW/cm2 from Nango et al.

spinqualitylabelsall models 9f9c, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9f9c is a 1 chain structure with sequence from Halobacterium salinarum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: LI1, OLC, RET Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function BACR_HALSA Light-driven proton pump. Publication Abstract from PubMed Time-resolved serial crystallography at X-ray Free Electron Lasers offers the opportunity to observe ultrafast photochemical reactions at the atomic level. The technique has yielded exciting molecular insights into various biological processes including light sensing and photochemical energy conversion. However, to achieve sufficient levels of activation within an optically dense crystal, high laser power densities are often used, which has led to an ongoing debate to which extent photodamage may compromise interpretation of the results. Here we compare time-resolved serial crystallographic data of the bacteriorhodopsin K-intermediate collected at laser power densities ranging from 0.04 to 2493 GW/cm(2) and follow energy dissipation of the absorbed photons logarithmically from picoseconds to milliseconds. Although the effects of high laser power densities on the overall structure are small, in the upper excitation range we observe significant changes in retinal conformation and increased heating of the functionally critical counterion cluster. We compare light-activation within crystals to that in solution and discuss the impact of the observed changes on bacteriorhodopsin biology. Structural effects of high laser power densities on an early bacteriorhodopsin photocycle intermediate.,Bertrand Q, Nogly P, Nango E, Kekilli D, Khusainov G, Furrer A, James D, Dworkowski F, Skopintsev P, Mous S, Martiel I, Borjesson P, Ortolani G, Huang CY, Kepa M, Ozerov D, Brunle S, Panneels V, Tanaka T, Tanaka R, Tono K, Owada S, Johnson PJM, Nass K, Knopp G, Cirelli C, Milne C, Schertler G, Iwata S, Neutze R, Weinert T, Standfuss J Nat Commun. 2024 Nov 27;15(1):10278. doi: 10.1038/s41467-024-54422-8. PMID:39604356 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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