Fizarolisin (EC 3.4.21.103, Dictyostelium discoideum aspartička proteinaza, Dictyostelium discoideum aspartička proteinaza E, Physarum flavicomum aspartička proteinaza, Physarum policephalum kiselinska proteinaza, Physarum aspartička proteinaza, fizaropepsin) je enzim.[1][2][3][4][5] Ovaj enzim katalizuje sledeću hemijsku reakciju
- Zgrušavanje mleka. Preferentno razlaganje Gly8-Ser u B lancu insulina je najbrže, tome sledi Leu11-Val, Cys(SO3H)19-Gly i Phe24-Phe.
Ovaj enzim priapada peptidaznoj familiji S53.
- ^ Henney, H.R. & Tavana, G. (1982). „Purification and some properties of an intracellular acid (carboxyl) proteinase from differentiating haploid cells of Physarum flavicomum”. Exp. Mycol. 6: 161—170.
- ^ Murakami-Murofushi, K., Hiratsuka, A. and Ohta, J. (1984). „A novel acid protease from haploid amoebae of Physarum polycephalum, and its changes during mating and subsequent differentiation into diploid plasmodia”. Cell Struct. Funct. 9: 311—315.
- ^ North, M.J. & Whyte, A. (1984). „Purification and characterization of two acid proteinases from Dictyostelium discoideum”. J. Gen. Microbiol. 130: 123—134.
- ^ Wlodawer, A., Li, M., Gustchina, A., Oyama, H., Dunn, B.M. and Oda, K. (2003). „Structural and enzymatic properties of the sedolisin family of serine-carboxyl peptidases”. Acta Biochim. Pol. 50: 81—102. PMID 12673349.
- ^ Nishii, W., Ueki, T., Miyashita, R., Kojima, M., Kim, Y.T., Sasaki, N., Murakami-Murofushi, K. and Takahashi, K. (2003). „Structural and enzymatic characterization of physarolisin (formerly physaropepsin) proves that it is a unique serine-carboxyl proteinase”. Biochem. Biophys. Res. Commun. 301: 1023—1029. PMID 12589815.