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• W2068530708 abstract "Serine proteinase inhibitors are widely distributed in nature and inhibit the activity of enzymes like trypsin and chymotrypsin. These proteins interfere with the physiological processes such as germination, maturation and form the first line of defense against the attack of seed predator. The most thoroughly examined plant serine proteinase inhibitors are found in the species of the families Leguminosae, Graminae, and Solanaceae. Leucaena leucocephala belongs to the family Leguminosae. It is widely used both as an ornamental tree as well as cattle food. We have constructed a three-dimensional model of a serine proteinase inhibitor from L. leucocephala seeds (LTI) complexed with trypsin. The model was built based on its comparative homology with soybean trypsin inhibitor (STI) using the program, MODELLER6. The quality of the model was assessed stereochemically by PROCHECK. LTI shows structural features characteristic of the Kunitz type trypsin inhibitor and shows 39% residue identity with STI. LTI consists of 172 amino acid residues and is characterized by two disulfide bridges. The protein is a dimer with the two chains being linked by a disulfide bridge. Despite the high similarity in the overall tertiary structure, significant differences exist at the active site between STI and LTI. The present study aims at analyzing these interactions based on the available amino acid sequences and structural data. We have also studied some functional sites such as phosphorylation, myristoylation, which can influence the inhibitory activity or complexation with other molecules. Some of the differences observed at the active site and functional sites can explain the unique features of LTI." @default.
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• W2068530708 date "2004-02-01" @default.
• W2068530708 modified "2023-09-28" @default.
• W2068530708 title "Molecular mechanism of enzyme inhibition: prediction of the three-dimensional structure of the dimeric trypsin inhibitor from Leucaena leucocephala by homology modelling" @default.
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• W2068530708 doi "https://doi.org/10.1016/j.bbrc.2003.12.177" @default.
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