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• W2013080863 abstract "The peptide trifluoroacetyl-Leu-Ala-(p-trifluoromethylanilide), is a reversible inhibitor of pancreatic porcine elastase and is characterized by a Km of 2.5 × 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 Å effective resolution). The RMS deviations from ideality of bond distances and angles are 0.02 Å and 2°, 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 Å, in a parallel β-sheet association with the loop 214–216. The analysis of the close contacts (less than 3.5 Å) 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." @default.
• W2013080863 created "2016-06-24" @default.
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• W2013080863 date "1990-02-01" @default.
• W2013080863 modified "2023-10-11" @default.
• W2013080863 title "Interaction of the peptide CF3-Leu-Ala-NH-C6 H4-CF3 (TFLA) with porcine pancreatic elastase. X-ray studies at 1.8 Å" @default.
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• W2013080863 doi "https://doi.org/10.1002/jmr.300030104" @default.
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