3pb3 | pdb_00003pb3

Structure of an Antibiotic Related Methyltransferase

spinqualitylabelsall models 3pb3, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3pb3 is a 2 chain structure with sequence from Escherichia coli. The February 2012 RCSB PDB Molecule of the Month feature on Aminoglycoside Antibiotics by David Goodsell is 10.2210/rcsb_pdb/mom_2012_2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SAH Related: 3p2e, 3p2i, 3p2k Gene: npmA (Escherichia coli) Resources: FirstGlance, OCA, RCSB, PDBsum Function [A8C927_ECOLX] Specifically methylates the N(1) position of adenine 1408 in 16S rRNA. Confers resistance to various aminoglycosides, including kanamycin, neomycin, apramycin, ribostamycin and gentamicin. Methylates only fully assembled 30S subunits. Publication Abstract from PubMed NpmA, a methyltransferase that confers resistance to aminoglycosides was identified in an Escherichia coli clinical isolate. It belongs to the kanamycin-apramycin methyltransferase (Kam) family and specifically methylates the 16S rRNA at the N1 position of A1408. We determined the structures of apo-NpmA and its complexes with S-adenosylmethionine (AdoMet) and S-adenosylhomocysteine (AdoHcy) at 2.4, 2.7 and 1.68 A, respectively. We generated a number of NpmA variants with alanine substitutions and studied their ability to bind the cofactor, to methylate A1408 in the 30S subunit, and to confer resistance to kanamycin in vivo. Residues D30, W107 and W197 were found to be essential. We have also analyzed the interactions between NpmA and the 30S subunit by footprinting experiments and computational docking. Helices 24, 42 and 44 were found to be the main NpmA-binding site. Both experimental and theoretical analyses suggest that NpmA flips out the target nucleotide A1408 to carry out the methylation. NpmA is plasmid-encoded and can be transferred between pathogenic bacteria; therefore it poses a threat to the successful use of aminoglycosides in clinical practice. The results presented here will assist in the development of specific NpmA inhibitors that could restore the potential of aminoglycoside antibiotics. Structural basis for the methylation of A1408 in 16S rRNA by a panaminoglycoside resistance methyltransferase NpmA from a clinical isolate and analysis of the NpmA interactions with the 30S ribosomal subunit.,Husain N, Obranic S, Koscinski L, Seetharaman J, Babic F, Bujnicki JM, Maravic-Vlahovicek G, Sivaraman J Nucleic Acids Res. 2010 Nov 9. PMID:21062819 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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