4p3f | pdb_00004p3f

Structure of the human SRP68-RBD

spinqualitylabelsall models 4p3f, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4p3f is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: EDO, PEG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SRP68_HUMAN Signal-recognition-particle assembly has a crucial role in targeting secretory proteins to the rough endoplasmic reticulum membrane. SRP68 binds the 7S RNA, SRP72 binds to this complex subsequently. This ribonucleoprotein complex might interact directly with the docking protein in the ER membrane and possibly participate in the elongation arrest function. Publication Abstract from PubMed The signal recognition particle (SRP) is central to membrane protein targeting; SRP RNA is essential for SRP assembly, elongation arrest, and activation of SRP guanosine triphosphatases. In eukaryotes, SRP function relies on the SRP68-SRP72 heterodimer. We present the crystal structures of the RNA-binding domain of SRP68 (SRP68-RBD) alone and in complex with SRP RNA and SRP19. SRP68-RBD is a tetratricopeptide-like module that binds to a RNA three-way junction, bends the RNA, and inserts an alpha-helical arginine-rich motif (ARM) into the major groove. The ARM opens the conserved 5f RNA loop, which in ribosome-bound SRP establishes a contact to ribosomal RNA. Our data provide the structural basis for eukaryote-specific, SRP68-driven RNA remodeling required for protein translocation. SRP RNA remodeling by SRP68 explains its role in protein translocation.,Grotwinkel JT, Wild K, Segnitz B, Sinning I Science. 2014 Apr 4;344(6179):101-4. doi: 10.1126/science.1249094. PMID:24700861 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Signal recognition particle protein

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