Produção e purificação integrada de protease fibrinolítica por Mucor subtilissimus UCP 1262

Abstract

The fibrinolytic proteases, due to its potential use in the treatment of thrombosis, have drawn attention from researchers because such diseases are a leading cause of death worldwide. The objective of this research was to produce and extract simultaneously the fibrinolytic protease by Mucor subtilissimus UCP 1262 through extractive fermentation with PEG/sodium sulfate. Homogeneous fermentations were carried out by changing the nitrogen source (soybean flour or wheat -1%), carbon source with 1% glucose, agitation 120 rpm and 30°C. Extractive fermentation assays were made using a 23 factorial design, changing the PEG molar mass (4,000, 6,000 and 8,000 g/mol), the PEG concentration (18, 24 and 30%) and salt concentration (10; 11,5; 13%). After 72 hours fermentation, the fibrinolytic protease had its best output in soy flour obtaining 13.43 U/mL and specific activity 749.27 U/mg in homogeneous cultures. However in the extractive fermentation, the sodium sulfate rich phase showed 15.40 U/mL fibrinolytic activity and 34.17 U/mg for specific activity in the assay comprises of sodium sulphate concentration (10%) and PEG (18%) and PEG molar mass (8000g/mol) and yields (Y) of 80% of the fibrinolytic protease. The protease has a pH optimum between 7.0 and stability pH 6.0 to 8.5 and optimum temperature 50°C, stable between 10°C to 50°C. It has similar specificity to chymotrypsin enzyme it has been classified as a serine protease having molecular weight of 52-kDa. Thus it was possible to pre-purify the fibrinolytic protease having a low cost process and considerably faster when compared to other isolated production and purification techniques by replacing the initial stages of conventional separation processes.