Bioactivities of Jc-SCRIP, a Type 1 Ribosome-Inactivating Protein fromJatropha curcasSeed Coat

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In this study, a type 1 RIP, designated as Jc-SCRIP, was first isolated from the seed coat ofJatropha curcasLinn. It was purified by ammonium sulfate precipitation and chromatography on DEAE-Sephacel™ and CM-cellulose columns. Purification fold of Jc-SCRIP increased 113.8 times, and the yield was 1.13% of the total protein in the final step. It was shown to be a monomeric glycoprotein with a molecular mass of 38 938 Da, as determined by MALDI-TOF/MS. It exhibited hemagglutination activity and possessed strongN-glycosidase activity. The antimicrobial activity of Jc-SCRIP was tested against nine human pathogenic bacteria and one fungus; the most potent inhibitory activity was againstStaphylococcus epidermidisATCC 12228, with minimum inhibitory concentration value of 0.20 μM. Jc-SCRIP demonstratedin vitrocytotoxicity against human breast adenocarcinoma cell line (MCF-7), a colon adenocarcinoma (SW620), and a liver carcinoma cell line (HepG2), with IC50 values of 0.15, 0.25, and 0.40 mM, respectively. The results suggested that Jc-SCRIP may be a potential natural antimicrobial and anticancer agent in medical applications.

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