1a3m

PAROMOMYCIN BINDING INDUCES A LOCAL CONFORMATIONAL CHANGE IN THE A SITE OF 16S RRNA, NMR, 20 STRUCTURES

spinqualitylabelsall models 1a3m Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1a3m is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Aminoglycoside antibiotics that bind to ribosomal RNA in the aminoacyl-tRNA site (A-site) cause misreading of the genetic code and inhibit translocation. An A-site RNA oligonucleotide specifically binds to aminoglycoside antibiotics and the structure of the RNA-paromomycin complex was previously determined by nuclear magnetic resonance (NMR) spectroscopy. Here, the A-site RNA structure in its free form has been determined using heteronuclear NMR and compared to the structure of the paromomycin-RNA complex. As in the complex with paromomycin, the asymmetric internal loop is closed by a Watson-Crick base-pair (C1407.G1494) and by two non-canonical base-pairs (U1406.U1495, A1408.A1493). A1492 stacks below A1493 and is intercalated between the upper and lower stems. The comparison of the free and bound conformations of the RNA shows that two universally conserved residues of the A site of 16 S rRNA, A1492 and A1493, are displaced towards the minor groove of the RNA helix in presence of antibiotic. These changes in the RNA conformation place the N1 positions of A1492 and A1493 on the minor groove side of the A-site RNA and suggest a mechanism of action of aminoglycosides on translation. Paromomycin binding induces a local conformational change in the A-site of 16 S rRNA.,Fourmy D, Yoshizawa S, Puglisi JD J Mol Biol. 1998 Mar 27;277(2):333-45. PMID:9514734 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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