1rtu
From Proteopedia
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| - | [[Image:1rtu.jpg|left|200px]]<br /><applet load="1rtu" size=" | + | [[Image:1rtu.jpg|left|200px]]<br /><applet load="1rtu" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1rtu, resolution 1.8Å" /> | caption="1rtu, resolution 1.8Å" /> | ||
'''USTILAGO SPHAEROGENA RIBONUCLEASE U2'''<br /> | '''USTILAGO SPHAEROGENA RIBONUCLEASE U2'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1RTU is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Ustilago_sphaerogena Ustilago sphaerogena] with SO4 as [http://en.wikipedia.org/wiki/ligand ligand]. Known structural/functional Site: <scene name='pdbsite=CAT:Catalytic Site'>CAT</scene>. Full crystallographic information is available from [http:// | + | 1RTU is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Ustilago_sphaerogena Ustilago sphaerogena] with <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Known structural/functional Site: <scene name='pdbsite=CAT:Catalytic+Site'>CAT</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RTU OCA]. |
==Reference== | ==Reference== | ||
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[[Category: hydrolase]] | [[Category: hydrolase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Feb 3 10:01:53 2008'' |
Revision as of 08:01, 3 February 2008
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USTILAGO SPHAEROGENA RIBONUCLEASE U2
Overview
The crystal structure of purine-specific ribonuclease (RNase) U2 from, Ustilago sphaerogena has been solved by the molecular replacement methods, using RNase T1 as a search model. The structure, with 114 amino acid, residues, 141 water molecules, and a sulfate ion, is refined to an R, factor of 0.143 at 1.8 A resolution. As evidenced by the electron, densities, residues 49 and 50 are revised to Glu 49 and Asp 50, respectively, and also Asp 45 is identified as a beta-isomerized form to, L-isoaspartate with a beta-peptide linkage. RNase U2 consists of a, beta-hairpin at residues from 7 to 14, a 4.4-turn alpha-helix from 16 to, 32, a central beta-sheet with five strands, and a protruding beta-turn, from 74 to 77. As for the catalytic site residues, His 41, Glu 62, and Arg, 85 are located as constituents of the central beta-sheet, and Tyr 39 and, His 101 are situated at either end of the beta-sheet. The side chains of, Tyr 39, Glu 62, Arg 85, and His 101 are hydrogen-bonded to the sulfate ion, which marks the RNA phosphate position. Though the side chain of His 41 is, pointing away from the sulfate, small conformational adjustments of His 41, enable the side chain to interact with either the phosphate or the ribose, group of RNA. The loop region from Tyr 44 to Asp 50 is ascribed to the, base recognition site where Glu 49 is involved in adenine recognition., beta-Isomerized Asp 45 suggests that this region is conformationally, flexible and alterable.
About this Structure
1RTU is a Single protein structure of sequence from Ustilago sphaerogena with as ligand. Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Crystal structure of Ustilago sphaerogena ribonuclease U2 at 1.8 A resolution., Noguchi S, Satow Y, Uchida T, Sasaki C, Matsuzaki T, Biochemistry. 1995 Nov 28;34(47):15583-91. PMID:7492561
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