PROPORTION OF ANTICANCER ACTIVITY OF PROTEIN AND PROTEIN HYDROLYSATE FROM EPIPHYTIC BACTERIA

This research aimed to explore the anticancer potential in the protein and hydrolysate protein produced by epiphytic bacteria associated with marine algae on the in vitro model of lung cancer LK-2. Protein was isolated from the bacterium Enterobacter unhas strain SG-A1 in which has an association with brown algae, Sargassum sp. A fractionation method has used in separating the protein. It was used as a dialysis process added by Tris HCl to conduct pre-purified of the fractions, and the pepsin enzyme was used in producing protein hydrolysate (pH 2.0, 37 ̊C) at 3:100 ratio of enzyme-substrate. Pre-screening of toxicity can be conducted using BSLT or Brine Shrimp Lethality Test. The cytotoxic effects of protein and protein hydrolysate on LK-2 cell lines during 16 h were determined by the yellow tetrazolium salt 3-(4, 5- dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay. The BSLT test revealed that the hydrolysate fractions were very toxic. It showed a higher magnitude of decreasing (significance p < 0.05) in cell viability in LK-2 cells. These findings suggested that the hydrolysate of protein produced by epiphytic bacteria brown algae associated, Sargassum sp. has a high probability of being used as cancer therapy agents.