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1tto

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{{STRUCTURE_1tto| PDB=1tto | SCENE= }}
{{STRUCTURE_1tto| PDB=1tto | SCENE= }}
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'''Crystal structure of the Rnase T1 variant R2'''
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===Crystal structure of the Rnase T1 variant R2===
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==Overview==
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Ribonuclease T1 is an enzyme that cleaves single-stranded RNA with high specificity after guanylyl residues. Although this enzyme is a very good characterized protein with respect to structure and enzymatic function, we were only recently successful in generating RNase T1-RV, a variant where the specificity was changed from guanine to purine. As this change of substrate specificity was made at the cost of activity, the aim was now to further improve the overall activity of the enzyme. Therefore, we have substituted the tryptophan in position 59 by tyrosine. This substitution led to an increase of enzymatic activity in comparison to variant RV to 425%. As the extent of this enhancement is unique so far we have crystallized and analyzed the structure of this variant in order to get more insights into the reasons for this. Here, we present the crystal structure of this so-called RNase T1-R2 at 2.1A resolution. The structure was determined by molecular replacement using the coordinates of the RV variant (PDB entry: 1Q9E). The data were refined to an R-factor of 18.7% and R(free) of 24%, respectively. The asymmetric unit contains three molecules and the crystal packing is very similar to that of variant RV.
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The line below this paragraph, {{ABSTRACT_PUBMED_16157302}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 16157302 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16157302}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Ribonuclease]]
[[Category: Ribonuclease]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:21:03 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 06:16:16 2008''

Revision as of 03:16, 28 July 2008

Image:1tto.png

Template:STRUCTURE 1tto

Crystal structure of the Rnase T1 variant R2

Template:ABSTRACT PUBMED 16157302

About this Structure

1TTO is a Single protein structure of sequence from Aspergillus oryzae. Full crystallographic information is available from OCA.

Reference

Purine activity of RNase T1RV is further improved by substitution of Trp59 by tyrosine., Czaja R, Perbandt M, Betzel C, Hahn U, Biochem Biophys Res Commun. 2005 Oct 28;336(3):882-9. PMID:16157302

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