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Carnivorous plants are known to secrete various endopeptidases extracellularly to digest prey proteins. Previously we purified two isoforms of nepenthesin to homogeneity and elucidated their enzymatic and structural characteristics. In a continuation of these studies, we have been attempting to characterize these and other endopeptidases secreted by carnivorous plants to digest prey proteins. Recently, we found and partially characterized a cysteine endopeptidase in the digestive fluid of Dionaea muscipula and named it “dionain”. In the present report, we describe the occurrence of a similar cysteine endopeptidase in the digestive fluid of Drosera indica and propose the name “droserain” to this enzyme. In this connection, we also propose the names of aspartic endopeptidases from the digestive fluids of relevant carnivorous plants.

The digestive fluid of Drosera indica contains a cysteine endopeptidase (“droserain“) similar to dionain from Dionaea muscipula