Abstract
A plant protease named microcarpain was purified from the latex of Ficus microcarpa by acetonic (20–40 % saturation) precipitation, Sephadex G-75 filtration, and Mono Q-Sefinose FF chromatography. The protease was purified with a yield of 9.25 % and a purification factor of 8. The molecular weight of the microcarpain was estimated to be 20 kDa by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The purified enzyme showed maximum activity at pH 8.0 and at a temperature of 70 °C. Proteolytic activity was strongly inhibited by dithio-bis-nitrobenzoic acid (DTNB), Hg2+, and Cu2+. The N-terminal amino acid sequence of the purified microcarpain “VPETVDWRSKGAV” showed high homology with a protease from Arabidopsis thaliana. Inhibition studies and N-terminal sequence classified the enzyme as a member of the cysteine peptidases family.
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This work was funded by the Ministry of Higher Education and Scientific Research, Tunisia.
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Mnif, I.H., Siala, R., Nasri, R. et al. A Cysteine Protease Isolated from the Latex of Ficus microcarpa: Purification and Biochemical Characterization. Appl Biochem Biotechnol 175, 1732–1744 (2015). https://doi.org/10.1007/s12010-014-1376-2
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DOI: https://doi.org/10.1007/s12010-014-1376-2