Investigation of the Substrate‐Binding Site of Trypsin by the Aid of Tripeptidyl‐p‐nitroanilide Substrates
The kinetic parameters of the tryptic hydrolysis of tripeptidyl‐p‐nitroanilide substrates were determined and the data were studied by regression analysis. The sequence of substrates optimal from the viewpoint of kinetic constants 1/Km, kcat, and kcat/Km was established and the influence of amino ac...
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Published in | European journal of biochemistry Vol. 115; no. 3; pp. 497 - 502 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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Oxford, UK
Blackwell Publishing Ltd
01.04.1981
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Abstract | The kinetic parameters of the tryptic hydrolysis of tripeptidyl‐p‐nitroanilide substrates were determined and the data were studied by regression analysis. The sequence of substrates optimal from the viewpoint of kinetic constants 1/Km, kcat, and kcat/Km was established and the influence of amino acid side chains on the binding and reactivity of substrates was calculated.
At subsite P3 [notation of Schechter and Berger (1967) Biochem. Biophys. Res. Commun. 27, 157] polar side chains (Asn, d‐Arg) are favourable as regards 1/Km, whereas hydrophobic side chains are preferred definitely from the viewpoint of catalytic efficiency, just as at subsite P2. In the side chain contributions, calculated :or the kinetic parameters, the P3–S3 interaction predominates, in spite of the fact that the properties of the residue at subsite P2 decide whether hydrolysis occurs at all. The ZAsn‐Ile‐Arg‐Nan sequence was predicted as a better substrate than those tested experimentally. The compound was synthesized, and the calculated value of its 1/Km (116.4 mM−1) was in a good agreement with the measured value (100.2 mM−1).
Comparing the data obtained with trypsin with those observed with thrombin, elastase and subtilisin, we can establish that the homology of these enzymes can be characterized at each binding subsite by the aid of tripeptidyl‐p‐nitroanilide substrates. The quantities derived allow one to envisage a novel type of comparison of the proteases. |
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AbstractList | The kinetic parameters of the tryptic hydrolysis of tripeptidyl-p-nitroanilide substrates were determined and the data were studied by regression analysis. The sequence of substrates optimal from the viewpoint of kinetic constants 1/Km, kcat and kcat/Km was established and the influence of amino acid side chains on the binding and reactivity of substrates was calculated. At subsite P3 [notation of Schechter and Berger (1967) Biochem. Biophys, Res. Commun. 27, 157] polar side chains (Asn, D-Arg) are favourable as regards 1/Km, whereas hydrophobic side chains are preferred definitely from the viewpoint of catalytic efficiency, just as at subsite P2. In the side chain contributions, calculated for the kinetic parameters, the P3-S3 interaction predominates, in spite of the fact that the properties of the residue at subsite P1 decide whether hydrolysis occurs at all. The ZAsn-Ile-Arg-Nan sequence was predicted as a better substrate than those tested experimentally. The compound was synthesized, and the calculated value of its 1/Km (116.4 mM-1) was in a good agreement with the measured value (100.2 mM-1). Comparing the data obtained with trypsin with those observed with thrombin, elastase and subtilisin, we can establish that the homology of these enzymes can be characterized at each binding subsite by the aid of tripeptidyl-p-nitroanilide substrates. The quantities derived allow one to envisage a novel type of comparison of the proteases. The kinetic parameters of the tryptic hydrolysis of tripeptidyl‐p‐nitroanilide substrates were determined and the data were studied by regression analysis. The sequence of substrates optimal from the viewpoint of kinetic constants 1/Km, kcat, and kcat/Km was established and the influence of amino acid side chains on the binding and reactivity of substrates was calculated. At subsite P3 [notation of Schechter and Berger (1967) Biochem. Biophys. Res. Commun. 27, 157] polar side chains (Asn, d‐Arg) are favourable as regards 1/Km, whereas hydrophobic side chains are preferred definitely from the viewpoint of catalytic efficiency, just as at subsite P2. In the side chain contributions, calculated :or the kinetic parameters, the P3–S3 interaction predominates, in spite of the fact that the properties of the residue at subsite P2 decide whether hydrolysis occurs at all. The ZAsn‐Ile‐Arg‐Nan sequence was predicted as a better substrate than those tested experimentally. The compound was synthesized, and the calculated value of its 1/Km (116.4 mM−1) was in a good agreement with the measured value (100.2 mM−1). Comparing the data obtained with trypsin with those observed with thrombin, elastase and subtilisin, we can establish that the homology of these enzymes can be characterized at each binding subsite by the aid of tripeptidyl‐p‐nitroanilide substrates. The quantities derived allow one to envisage a novel type of comparison of the proteases. |
Author | POZSGAY, Marianne GÁSPÁR, Rezsö SIMONSSON, Roger CS. SZABÓ, Gabriella ELÖDI, Pál BAJUSZ, Sindor |
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Snippet | The kinetic parameters of the tryptic hydrolysis of tripeptidyl‐p‐nitroanilide substrates were determined and the data were studied by regression analysis. The... The kinetic parameters of the tryptic hydrolysis of tripeptidyl-p-nitroanilide substrates were determined and the data were studied by regression analysis. The... |
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SubjectTerms | Anilides Animals Binding Sites Cattle Kinetics Pancreas - enzymology Peptides Protein Binding Structure-Activity Relationship Substrate Specificity Trypsin - metabolism |
Title | Investigation of the Substrate‐Binding Site of Trypsin by the Aid of Tripeptidyl‐p‐nitroanilide Substrates |
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