7est

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{{STRUCTURE_7est| PDB=7est | SCENE= }}
{{STRUCTURE_7est| PDB=7est | SCENE= }}
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'''INTERACTION OF THE PEPTIDE CF3-LEU-ALA-NH-C6H4-CF3(TFLA) WITH PORCINE PANCREATIC ELASTASE. X-RAY STUDIES AT 1.8 ANGSTROMS'''
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===INTERACTION OF THE PEPTIDE CF3-LEU-ALA-NH-C6H4-CF3(TFLA) WITH PORCINE PANCREATIC ELASTASE. X-RAY STUDIES AT 1.8 ANGSTROMS===
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==Overview==
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The peptide trifluoroacetyl-Leu-Ala-(p-trifluoromethylanilide), is a reversible inhibitor of pancreatic porcine elastase and is characterized by a Km of 2.5 x 10(-8) M. Co-crystals of the 1:1 complex were obtained in an acetate buffer + dimethylformamide solution at pH 5.7. Diffraction data were recorded on films at the LURE synchrotron facility. The inhibitor was localized on difference Fourier maps, and the refinement of the structure was performed by simulated annealing (XPLOR). The current agreement factor is R = 19% (for 13224 observed structure factors and 1.8 A effective resolution). The RMS deviations from ideality of bond distances and angles are 0.02 A and 2 degrees, respectively. The inhibitor molecule was found in the active site, bent around the side chain of Phe-215 in a geometry that resembles the previously reported structure of the CF3-Lys-Ala complex at 2.5 A, in a parallel beta-sheet association with the loop 214-216. The analysis of the close contacts (less than 3.5 A) indicates that the trifluoromethylamide bond interacts with the active site and not the Leu-Ala or Ala-anilide bonds. The two fluorinated groups of the inhibitor exhibit different specificities: the trifluoroacetyl group (N terminus) is tightly stacked between the two chain loops 191-195 and 213-215, while the trifluoromethylanilide (C terminus) shows less specificity and only a single contact.
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(as it appears on PubMed at http://www.pubmed.gov), where 2354062 is the PubMed ID number.
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{{ABSTRACT_PUBMED_2354062}}
==About this Structure==
==About this Structure==
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[[Category: Lasierra, I Li De.]]
[[Category: Lasierra, I Li De.]]
[[Category: Prange, T.]]
[[Category: Prange, T.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:44:36 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 14:32:26 2008''

Revision as of 11:32, 3 July 2008

Image:7est.png

Template:STRUCTURE 7est

INTERACTION OF THE PEPTIDE CF3-LEU-ALA-NH-C6H4-CF3(TFLA) WITH PORCINE PANCREATIC ELASTASE. X-RAY STUDIES AT 1.8 ANGSTROMS

Template:ABSTRACT PUBMED 2354062

About this Structure

7EST is a Single protein structure of sequence from Sus scrofa. Full crystallographic information is available from OCA.

Reference

Interaction of the peptide CF3-Leu-Ala-NH-C6H4-CF3 (TFLA) with porcine pancreatic elastase. X-ray studies at 1.8 A., de la Sierra IL, Papamichael E, Sakarellos C, Dimicoli JL, Prange T, J Mol Recognit. 1990 Feb;3(1):36-44. PMID:2354062

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