Details

Autor(en) / Beteiligte

• Muhammad, Abubakar
• Syed Ali Imran, Bokhari
• Jean-Paul, Vernoux
• Muhammad, Ishtiaq Ali
• Faryal, Rani
• Nathalie, Desmasures
• Muhammad, Imran

Titel

Purification, Characterization and Thermodynamic Assessment of an Alkaline Protease by Geotrichum Candidum of Dairy Origin

Ist Teil von

• Iranian journal of biotechnology, 2019-06, Vol.17 (2), p.30-37

Ort / Verlag

National Institute of Genetic Engineering and Biotechnology, Tehran

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Background: Alkaline proteases is the important group of enzymes having numerous industrial applications including dairy food formulations.Objectives: The current study deals with the purification and characterization of an alkaline serine protease produced by Geotrichum candidum QAUGC01, isolated from indigenous fermented milk product, Dahi.Material and Methods: In total twelve G. candidum strains were screened for their proteolytic activity by using standard protease assay. The protease production from G. candidum QAUGC01 was optimized by varying physio-chemical conditions. The protease was purified by using two-step method: ammonium sulfate precipitation and gel filtration chromatography. Protease was further characterized by studying various parameter like temperature, pH, modulators, metal ions and organic solvent. A thermodynamic study was also carried out to explore the half-life of protease.Results: The G. candidum grew profusely at 25 °C and at an initial pH of 4.0 for 72 h of incubation producing 26.21 U/mlmaximum extracellular protease. Protease revealed that Vmax and Km was 26.25 U.ml-1.min-1 and 0.05 mg.mL-1, respectively using casein as substrate. The enzyme was stable at a temperature range (25-45 ºC) and pH (8-9). Residual enzyme activity was strongly inhibited in the presence of PMSF (7.5%). The protease could hydrolyze proteinaceous substrates, casein (98%) and BSA (95%). The thermodynamic studies explored that the half-life of the enzyme that was 106.62 min, 38.72 min and 15.71 min at 50, 60 and 70 ºC, respectively.Conclusions: Purified protease from G. candidum GCQAU01 is an ideal candidate for industrial application.