3d2g

Structural basis of thiamine pyrophosphate analogues binding to the eukaryotic riboswitch

spinqualitylabelsall models 3d2g, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3d2g is a 2 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.25Å Ligands: MG, TPP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The thiamine pyrophosphate (TPP)-sensing riboswitch is the only riboswitch found in eukaryotes. In plants, TPP regulates its own production by binding to the 3' untranslated region of the mRNA encoding ThiC, a critical enzyme in thiamine biosynthesis, which promotes the formation of an unstable splicing variant. In order to better understand the molecular basis of TPP-analogue binding to the eukaryotic TPP-responsive riboswitch, we have determined the crystal structures of the Arabidopsis thaliana TPP-riboswitch in complex with oxythiamine pyrophosphate (OTPP) and with the antimicrobial compound pyrithiamine pyrophosphate (PTPP). The OTPP-riboswitch complex reveals that the pyrimidine ring of OTPP is stabilized in its enol form in order to retain key interactions with guanosine 28 of the riboswitch previously observed in the TPP complex. The structure of PTPP in complex with the riboswitch shows that the base moiety of guanosine 60 undergoes a conformational change to cradle the pyridine ring of the PTPP. Structural information from these complexes has implications for the design of novel antimicrobials targeting TPP-sensing riboswitches. Structural basis of thiamine pyrophosphate analogues binding to the eukaryotic riboswitch.,Thore S, Frick C, Ban N J Am Chem Soc. 2008 Jul 2;130(26):8116-7. Epub 2008 Jun 6. PMID:18533652 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Riboswitch 3D structures

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