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1trq

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[[Image:1trq.gif|left|200px]]
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{{STRUCTURE_1trq| PDB=1trq | SCENE= }}
{{STRUCTURE_1trq| PDB=1trq | SCENE= }}
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'''X-RAY CRYSTALLOGRAPHIC AND CALORIMERIC STUDIES OF THE EFFECTS OF THE MUTATION TRP 59 TYR IN RIBONUCLEASE T1'''
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===X-RAY CRYSTALLOGRAPHIC AND CALORIMERIC STUDIES OF THE EFFECTS OF THE MUTATION TRP 59 TYR IN RIBONUCLEASE T1===
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==Overview==
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Two mutants of ribonuclease T1 (RNaseT1), [59-tyrosine]ribonuclease T1 (W59Y) and [45-tryptophan,59-tyrosine]ribonuclease T1 (Y45W/W59Y) possess between 150% and 190% wild-type activity. They have been crystallised as complexes of the inhibitor 2'-guanylic acid and analysed by X-ray diffraction at resolutions of 0.23 nm and 0.24 nm, respectively. The space group for both is monoclinic, P2(1), with two molecules/asymmetric unit, W59Y: a = 4.934 nm, b = 4.820 nm, c = 4.025 nm, beta = 90.29 degrees. Y45W/W59Y: a = 4.915 nm, b = 4.815 nm, c = 4.015 nm, beta = 90.35 degrees. Compared to wild-type RNaseT1 in complex with 2'-guanylic acid (2'GMP) both mutant inhibitor complexes indicate that the replacement of Trp59 by Tyr leads to a 0.04-nm inward shift of the single alpha-helix and to significant differences in the active-site geometry, inhibitor conformation and inhibitor binding. Calorimetric studies of a range of mutants [24-tryptophan]ribonuclease T1 (Y24W), [42-tryptophan]ribonuclease T1 (Y42W), [45-tryptophan]ribonuclease T1 (Y45W), [92-alanine]ribonuclease T1 (H92A) and [92-threonine]ribonuclease T1 (H92T) with and without the further mutation Trp59--&gt;Tyr showed that mutant proteins for which Trp59 is replaced by Tyr exhibit slightly decreased thermal stability.
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{{ABSTRACT_PUBMED_8125111}}
==About this Structure==
==About this Structure==
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[[Category: Saenger, W.]]
[[Category: Saenger, W.]]
[[Category: Schubert, W D.]]
[[Category: Schubert, W D.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:17:46 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 13:18:38 2008''

Revision as of 10:18, 29 July 2008

Image:1trq.png

Template:STRUCTURE 1trq

X-RAY CRYSTALLOGRAPHIC AND CALORIMERIC STUDIES OF THE EFFECTS OF THE MUTATION TRP 59 TYR IN RIBONUCLEASE T1

Template:ABSTRACT PUBMED 8125111

About this Structure

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

Reference

X-ray crystallographic and calorimetric studies of the effects of the mutation Trp59-->Tyr in ribonuclease T1., Schubert WD, Schluckebier G, Backmann J, Granzin J, Kisker C, Choe HW, Hahn U, Pfeil W, Saenger W, Eur J Biochem. 1994 Mar 1;220(2):527-34. PMID:8125111

Page seeded by OCA on Tue Jul 29 13:18:38 2008

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