Publication date: September 2017
Source:International Journal of Biological Macromolecules, Volume 102
Author(s): Wangsa T. Ismaya, Olivia M. Tandrasasmita, Syaripah Sundari, Diana, Xuelei Lai, Debbie S. Retnoningrum, Bauke W. Dijkstra, Raymond R. Tjandrawinata, Heni Rachmawati
The light subunit of mushroom Agaricus bisporus tyrosinase (LSMT) is a protein of unknown function that was discovered serendipitously during the elucidation of the crystal structure of the enzyme. The protein is non-immunogenic and can penetrate the intestinal epithelial cell barrier, and thus, similar to its structural homologue HA-33 from Clostridium botulinum, may be potentially absorbable by the intestine. LSMT also shares high structural homology with the ricin-B-like lectin from the mushroom Clitocybe nebularis (CNL), which has been shown to display biological activity against leukemic cancer cells and dendritic cells. Therefore, we evaluated the biological activity of LSMT. An in vitro assay suggested that LSMT presentation to most of the cancer cell lines studied has a negligible effect on their proliferation. However, inhibition of cell growth and a slight stimulation of cell proliferation were observed with breast cancer and macrophage cells, respectively. LSMT appeared to be relatively resistant against proteolysis by trypsin and papain, but not bromelain. Challenges with gastric and intestinal juice suggested that the protein is resistant to gastrointestinal tract conditions. This is the first report on the biological characteristics and implication of LSMT.
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