1xst
From Proteopedia
(New page: 200px<br /><applet load="1xst" size="450" color="white" frame="true" align="right" spinBox="true" caption="1xst" /> '''Solution structure of E.coli RNase P RNA P4 ...) |
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| - | [[Image:1xst.gif|left|200px]]<br /><applet load="1xst" size=" | + | [[Image:1xst.gif|left|200px]]<br /><applet load="1xst" size="350" color="white" frame="true" align="right" spinBox="true" |
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'''Solution structure of E.coli RNase P RNA P4 stem, U69A mutation, complexed with cobalt (III) hexammine.'''<br /> | '''Solution structure of E.coli RNase P RNA P4 stem, U69A mutation, complexed with cobalt (III) hexammine.'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The solution structures of two 27 nt RNA hairpins and their complexes with | + | The solution structures of two 27 nt RNA hairpins and their complexes with cobalt(III)-hexammine [Co(NH(3))(6)(3+)] were determined by NMR spectroscopy. The RNA hairpins are variants of the P4 region from Escherichia coli RNase P RNA: a U-to-A mutant changing the identity of the bulged nucleotide, and a U-to-C, C-to-U double mutant changing only the bulge position. Structures calculated from NMR constraints show that the RNA hairpins adopt different conformations. In the U-to-C, C-to-U double mutant, the conserved bulged uridine in the P4 wild-type stem is found to be shifted in the 3'-direction by one nucleotide when compared with the wild-type structure. Co(NH(3))(6)(3+) is used as a spectroscopic probe for Mg(H(2)O)(6)(2+) binding sites because both complexes have octahedral symmetry and have similar radii. Intermolecular NOE crosspeaks between Co(NH(3))(6)(3+) and RNA protons were used to locate the site of Co(NH(3))(6)(3+) binding to both RNA hairpins. The metal ion binds in the major groove near a bulge loop in both mutants, but is shifted 3' by about one base pair in the double mutant. The change of the metal ion binding site is compared with results obtained on corresponding mutant RNase P RNA molecules as reported by Harris and co-workers (RNA, 1, 210-218). |
==About this Structure== | ==About this Structure== | ||
| - | 1XST is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ] with NCO as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1XST is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ] with <scene name='pdbligand=NCO:'>NCO</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XST OCA]. |
==Reference== | ==Reference== | ||
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[[Category: u69a mutant]] | [[Category: u69a mutant]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:58:17 2008'' |
Revision as of 13:58, 21 February 2008
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Solution structure of E.coli RNase P RNA P4 stem, U69A mutation, complexed with cobalt (III) hexammine.
Overview
The solution structures of two 27 nt RNA hairpins and their complexes with cobalt(III)-hexammine [Co(NH(3))(6)(3+)] were determined by NMR spectroscopy. The RNA hairpins are variants of the P4 region from Escherichia coli RNase P RNA: a U-to-A mutant changing the identity of the bulged nucleotide, and a U-to-C, C-to-U double mutant changing only the bulge position. Structures calculated from NMR constraints show that the RNA hairpins adopt different conformations. In the U-to-C, C-to-U double mutant, the conserved bulged uridine in the P4 wild-type stem is found to be shifted in the 3'-direction by one nucleotide when compared with the wild-type structure. Co(NH(3))(6)(3+) is used as a spectroscopic probe for Mg(H(2)O)(6)(2+) binding sites because both complexes have octahedral symmetry and have similar radii. Intermolecular NOE crosspeaks between Co(NH(3))(6)(3+) and RNA protons were used to locate the site of Co(NH(3))(6)(3+) binding to both RNA hairpins. The metal ion binds in the major groove near a bulge loop in both mutants, but is shifted 3' by about one base pair in the double mutant. The change of the metal ion binding site is compared with results obtained on corresponding mutant RNase P RNA molecules as reported by Harris and co-workers (RNA, 1, 210-218).
About this Structure
1XST is a Protein complex structure of sequences from [1] with as ligand. Full crystallographic information is available from OCA.
Reference
Change of RNase P RNA function by single base mutation correlates with perturbation of metal ion binding in P4 as determined by NMR spectroscopy., Schmitz M, Nucleic Acids Res. 2004 Dec 2;32(21):6358-66. Print 2004. PMID:15576680
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