1y27
From Proteopedia
(New page: 200px<br /><applet load="1y27" size="450" color="white" frame="true" align="right" spinBox="true" caption="1y27, resolution 2.40Å" /> '''G-riboswitch-guanine...) |
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| - | [[Image:1y27.gif|left|200px]]<br /><applet load="1y27" size=" | + | [[Image:1y27.gif|left|200px]]<br /><applet load="1y27" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1y27, resolution 2.40Å" /> | caption="1y27, resolution 2.40Å" /> | ||
'''G-riboswitch-guanine complex'''<br /> | '''G-riboswitch-guanine complex'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Metabolite-sensing mRNAs, or "riboswitches," specifically interact with | + | Metabolite-sensing mRNAs, or "riboswitches," specifically interact with small ligands and direct expression of the genes involved in their metabolism. Riboswitches contain sensing "aptamer" modules, capable of ligand-induced structural changes, and downstream regions, harboring expression-controlling elements. We report the crystal structures of the add A-riboswitch and xpt G-riboswitch aptamer modules that distinguish between bound adenine and guanine with exquisite specificity and modulate expression of two different sets of genes. The riboswitches form tuning fork-like architectures, in which the prongs are held in parallel through hairpin loop interactions, and the internal bubble zippers up to form the purine binding pocket. The bound purines are held by hydrogen bonding interactions involving conserved nucleotides along their entire periphery. Recognition specificity is associated with Watson-Crick pairing of the encapsulated adenine and guanine ligands with uridine and cytosine, respectively. |
==About this Structure== | ==About this Structure== | ||
| - | 1Y27 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with PO2 and G as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 1Y27 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with <scene name='pdbligand=PO2:'>PO2</scene> and <scene name='pdbligand=G:'>G</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Y27 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Bacillus subtilis]] | [[Category: Bacillus subtilis]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
| - | [[Category: Patel, D | + | [[Category: Patel, D J.]] |
[[Category: Serganov, A.]] | [[Category: Serganov, A.]] | ||
| - | [[Category: Yuan, Y | + | [[Category: Yuan, Y R.]] |
[[Category: G]] | [[Category: G]] | ||
[[Category: PO2]] | [[Category: PO2]] | ||
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[[Category: g-riboswitch guanine recognition]] | [[Category: g-riboswitch guanine recognition]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:01:03 2008'' |
Revision as of 14:01, 21 February 2008
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G-riboswitch-guanine complex
Overview
Metabolite-sensing mRNAs, or "riboswitches," specifically interact with small ligands and direct expression of the genes involved in their metabolism. Riboswitches contain sensing "aptamer" modules, capable of ligand-induced structural changes, and downstream regions, harboring expression-controlling elements. We report the crystal structures of the add A-riboswitch and xpt G-riboswitch aptamer modules that distinguish between bound adenine and guanine with exquisite specificity and modulate expression of two different sets of genes. The riboswitches form tuning fork-like architectures, in which the prongs are held in parallel through hairpin loop interactions, and the internal bubble zippers up to form the purine binding pocket. The bound purines are held by hydrogen bonding interactions involving conserved nucleotides along their entire periphery. Recognition specificity is associated with Watson-Crick pairing of the encapsulated adenine and guanine ligands with uridine and cytosine, respectively.
About this Structure
1Y27 is a Protein complex structure of sequences from Bacillus subtilis with and as ligands. Full crystallographic information is available from OCA.
Reference
Structural basis for discriminative regulation of gene expression by adenine- and guanine-sensing mRNAs., Serganov A, Yuan YR, Pikovskaya O, Polonskaia A, Malinina L, Phan AT, Hobartner C, Micura R, Breaker RR, Patel DJ, Chem Biol. 2004 Dec;11(12):1729-41. PMID:15610857
Page seeded by OCA on Thu Feb 21 16:01:03 2008
