7vgv | pdb_00007vgv

Anion free form of light-driven chloride ion-pumping rhodopsin, NM-R3, structure determined by serial femtosecond crystallography at SACLA

spinqualitylabelsall models 7vgv, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7vgv is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: C14, CL, DD9, HEX, OCT, R16, RET Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Light-driven chloride-pumping rhodopsins actively transport anions, including various halide ions, across cell membranes. Recent studies using time-resolved serial femtosecond crystallography (TR-SFX) have uncovered the structural changes and ion transfer mechanisms in light-driven cation-pumping rhodopsins. However, the mechanism by which the conformational changes pump an anion to achieve unidirectional ion transport, from the extracellular side to the cytoplasmic side, in anion-pumping rhodopsins remains enigmatic. We have collected TR-SFX data of Nonlabens marinus rhodopsin-3 (NM-R3), derived from a marine flavobacterium, at 10-micros and 1-ms time points after photoexcitation. Our structural analysis reveals the conformational alterations during ion transfer and after ion release. Movements of the retinal chromophore initially displace a conserved tryptophan to the cytoplasmic side of NM-R3, accompanied by a slight shift of the halide ion bound to the retinal. After ion release, the inward movements of helix C and helix G and the lateral displacements of the retinal block access to the extracellular side of NM-R3. Anomalous signal data have also been obtained from NM-R3 crystals containing iodide ions. The anomalous density maps provide insight into the halide binding site for ion transfer in NM-R3. Conformational alterations in unidirectional ion transport of a light-driven chloride pump revealed using X-ray free electron lasers.,Hosaka T, Nomura T, Kubo M, Nakane T, Fangjia L, Sekine SI, Ito T, Murayama K, Ihara K, Ehara H, Kashiwagi K, Katsura K, Akasaka R, Hisano T, Tanaka T, Tanaka R, Arima T, Yamashita A, Sugahara M, Naitow H, Matsuura Y, Yoshizawa S, Tono K, Owada S, Nureki O, Kimura-Someya T, Iwata S, Nango E, Shirouzu M Proc Natl Acad Sci U S A. 2022 Mar 1;119(9). pii: 2117433119. doi:, 10.1073/pnas.2117433119. PMID:35197289 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rhodopsin 3D structures

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