7v2q

T.thermophilus 30S ribosome with KsgA, class K6

spinqualitylabelsall models 7v2q, resolution 3.24Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7v2q is a 10 chain structure with sequence from Thermus thermophilus HB8. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.24Å Ligands: ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Methylation of specific nucleotides is integral for ribosomal biogenesis and also serves as a common mechanism to confer antibiotic resistance by pathogenic bacteria. Here, by determining the high-resolution structure of the 30S-KsgA complex by cryo-electron microscopy, a state was captured, where KsgA juxtaposes between helices h44 and h45 of the 30S ribosome, separating them, thereby enabling remodeling of the surrounded rRNA and allowing the cognate site to enter the methylation pocket. With the structure as a guide, several mutant versions of the ribosomes, where interacting bases in the catalytic helix h45 and surrounding helices h44, h24, and h27, were mutated and evaluated for their methylation efficiency revealing factors that direct the enzyme to its cognate site with high fidelity. The biochemical studies show that the three-dimensional environment of the ribosome enables the interaction of select loop regions in KsgA with the ribosome helices paramount to maintain selectivity. Decoding the Mechanism of Specific RNA Targeting by Ribosomal Methyltransferases.,Singh J, Raina R, Vinothkumar KR, Anand R ACS Chem Biol. 2022 Apr 15;17(4):829-839. doi: 10.1021/acschembio.1c00732. Epub , 2022 Mar 22. PMID:35316014 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Adenosine dimethyltransferase 3D structures Ribosomal protein THX 3D structures Ribosome 3D structures

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