1trp
From Proteopedia
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[[Image:1trp.gif|left|200px]] | [[Image:1trp.gif|left|200px]] | ||
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'''X-RAY CRYSTALLOGRAPHIC AND CALORIMERIC STUDIES OF THE EFFECTS OF THE MUTATION TRP 59 TYR IN RIBONUCLEASE T1''' | '''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 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:[http://www.ncbi.nlm.nih.gov/pubmed/8125111 8125111] | 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:[http://www.ncbi.nlm.nih.gov/pubmed/8125111 8125111] | ||
[[Category: Aspergillus oryzae]] | [[Category: Aspergillus oryzae]] | ||
| - | [[Category: Ribonuclease T(1)]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Saenger, W.]] | [[Category: Saenger, W.]] | ||
[[Category: Schluckebier, G.]] | [[Category: Schluckebier, G.]] | ||
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Revision as of 07:17, 3 May 2008
X-RAY CRYSTALLOGRAPHIC AND CALORIMERIC STUDIES OF THE EFFECTS OF THE MUTATION TRP 59 TYR IN RIBONUCLEASE T1
Overview
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-->Tyr showed that mutant proteins for which Trp59 is replaced by Tyr exhibit slightly decreased thermal stability.
About this Structure
1TRP 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 Sat May 3 10:17:45 2008
