8a3l | pdb_00008a3l

Structural insights into the binding of bS1 to the ribosome

spinqualitylabelsall models 8a3l, resolution 3.42Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8a3l is a 10 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.42Å Ligands: 1MG, 2MA, 2MG, 3TD, 4D4, 4OC, 4SU, 5MC, 5MU, 6MZ, D2T, G7M, H2U, MA6, MEQ, MG, MS6, OMC, OMG, OMU, PSU, UR3, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RS1_ECOLI Binds mRNA; thus facilitating recognition of the initiation point. It is needed to translate mRNA with a short Shine-Dalgarno (SD) purine-rich sequence. Publication Abstract from PubMed The multidomain ribosomal protein bS1 is the biggest and the most flexible and dynamic protein in the 30S small subunit. Despite being essential for mRNA recruitment and its primary role in the accommodation of the start codon within the decoding centre, there has not yet been a high-resolution description of its structure. Here, we present a 3D atomic model of OB1 and OB2, bS1's first two N-terminal domains, bound to an elongation-competent 70S ribosome. Our structure reveals that, as previously reported, bS1 is anchored both by a pi-stacking to the 30S subunit and via a salt bridge with the Zn2+ pocket of bS1. These contacts are further stabilized by other interactions with additional residues on OB1. Our model also shows a new conformation of OB2, interacting with the Shine-Dalgarno portion of the mRNA. This study confirms that OB1 plays an anchoring role, but also highlights a novel function for OB2, which is directly involved in the modulation and support of mRNA binding and accommodation on the ribosome. Structural insights into the binding of bS1 to the ribosome.,D'Urso G, Chat S, Gillet R, Giudice E Nucleic Acids Res. 2023 Apr 24;51(7):3410-3419. doi: 10.1093/nar/gkad126. PMID:36840711 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosome 3D structures

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