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Procerain B, a novel cysteine protease (endopeptidase) isolated from  Calotropis procera  belongs to Asclepiadaceae family. Purification of the enzyme, biochemical characterization and potential applications are already published by our group. Here, we report cDNA cloning, complete amino acid sequencing and molecular modeling of procerain B. The derived amino acid sequence showed high sequence homology with other papain like plant cysteine proteases of peptidase C1A superfamily. The three dimensional structure of active procerain B was modeled by homology modeling using X-ray crystal structure of actinidin (PDB ID: 3P5U), a cysteine protease from the fruits of  Actinidia arguta . The structural aspect of the enzyme is also discussed.

cDNA Cloning and Molecular Modeling of Procerain B, a Novel Cysteine Endopeptidase Isolated from Calotropis procera