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2001 | 48 | 4 | 995-1002
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Influence of Me2SO and incubation time on papain activity studied using fluorogenic substrates.

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Papain activity in a buffer containing Me2SO was studied using fluorogenic substrates. It was found that the number of active sites of papain decreases with increasing Me2SO concentration whereas the incubation time, in a buffer containing 3% Me2SO does not affect the number of active sites. However, an increase of papain incubation time in the buffer with 3% Me2SO decreased the initial rate of hydrolysis of Z-Phe-Arg-Amc as well as Dabcyl-Lys-Phe-Gly-Gly-Ala-Ala-Edans. Moreover, an increase of Me2SO concentration in working buffer decreased the initial rate of papain-catalysed hydrolysis of both substrates. A rapid decrease of the initial rate (by up to 30%) was observed between 1 and 2% Me2SO. Application of the Michaelis-Menten equation revealed that at the higher Me2SO concentrations the apparent values of kcat/Km decreased as a result of Km increase and kcat decrease. However, Me2SO changed the substrate binding process more effectively (Km) than the rate of catalysis kcat..

Physical description
  • Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland
  • Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland
  • Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland
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