3x3b

Crystal structure of the light-driven sodium pump KR2 in acidic state

spinqualitylabelsall models 3x3b, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3x3b is a 1 chain structure with sequence from Dokdonia eikasta. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.3Å Ligands: OLA, PEG, RET Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function N0DKS8_9FLAO Publication Abstract from PubMed Krokinobacter eikastus rhodopsin 2 (KR2) is the first light-driven Na(+) pump discovered, and is viewed as a potential next-generation optogenetics tool. Since the positively charged Schiff base proton, located within the ion-conducting pathway of all light-driven ion pumps, was thought to prohibit the transport of a non-proton cation, the discovery of KR2 raised the question of how it achieves Na(+) transport. Here we present crystal structures of KR2 under neutral and acidic conditions, which represent the resting and M-like intermediate states, respectively. Structural and spectroscopic analyses revealed the gating mechanism, whereby the flipping of Asp116 sequesters the Schiff base proton from the conducting pathway to facilitate Na(+) transport. Together with the structure-based engineering of the first light-driven K(+) pumps, electrophysiological assays in mammalian neurons and behavioural assays in a nematode, our studies reveal the molecular basis for light-driven non-proton cation pumps and thus provide a framework that may advance the development of next-generation optogenetics. Structural basis for Na(+) transport mechanism by a light-driven Na(+) pump.,Kato HE, Inoue K, Abe-Yoshizumi R, Kato Y, Ono H, Konno M, Hososhima S, Ishizuka T, Hoque MR, Kunitomo H, Ito J, Yoshizawa S, Yamashita K, Takemoto M, Nishizawa T, Taniguchi R, Kogure K, Maturana AD, Iino Y, Yawo H, Ishitani R, Kandori H, Nureki O Nature. 2015 May 7;521(7550):48-53. doi: 10.1038/nature14322. Epub 2015 Apr 6. PMID:25849775 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rhodopsin 3D structures

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