7xzi

Cryo-EM structure of TOC-TIC supercomplex from Chlamydomonas reinhardtii

spinqualitylabelsall models 7xzi, resolution 2.77Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7xzi is a 10 chain structure with sequence from Chlamydomonas reinhardtii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.77Å Ligands: AJP, D12, IHP, LHG, LMG, R16 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A2K3D4W3_CHLRE Publication Abstract from PubMed Chloroplasts rely on the translocon complexes in the outer and inner envelope membranes (the TOC and TIC complexes, respectively) to import thousands of different nuclear-encoded proteins from the cytosol(1-4). Although previous studies indicated that the TOC and TIC complexes may assemble into larger supercomplexes(5-7), the overall architectures of the TOC-TIC supercomplexes and the mechanism of preprotein translocation are unclear. Here we report the cryo-electron microscopy structure of the TOC-TIC supercomplex from Chlamydomonas reinhardtii. The major subunits of the TOC complex (Toc75, Toc90 and Toc34) and TIC complex (Tic214, Tic20, Tic100 and Tic56), three chloroplast translocon-associated proteins (Ctap3, Ctap4 and Ctap5) and three newly identified small inner-membrane proteins (Simp1-3) have been located in the supercomplex. As the largest protein, Tic214 traverses the inner membrane, the intermembrane space and the outer membrane, connecting the TOC complex with the TIC proteins. An inositol hexaphosphate molecule is located at the Tic214-Toc90 interface and stabilizes their assembly. Four lipid molecules are located within or above an inner-membrane funnel formed by Tic214, Tic20, Simp1 and Ctap5. Multiple potential pathways found in the TOC-TIC supercomplex may support translocation of different substrate preproteins into chloroplasts. Architecture of chloroplast TOC-TIC translocon supercomplex.,Liu H, Li A, Rochaix JD, Liu Z Nature. 2023 Mar;615(7951):349-357. doi: 10.1038/s41586-023-05744-y. Epub 2023 , Jan 26. PMID:36702157 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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