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Effects on trypsin

Calcium ion has a very specific effect on trypsin (Gorini, 1951), and Mn++ and Cd++ act similarly. However, other bivalent ions such as Mg++, Ba++, Si, Co++, Cu", or Ni++ are without effect (Nord and Bier, 1953). Duke, Bier, and Nord (1952) found that calcium increased the acidity of the carboxyl groups of trypsin between pH 3.5 and 5, and concluded that this was due to chelation of Ca++ with carboxyl groups. Their titration curves for trypsin in the presence of CaCh, MgCh, and KCl are shown in Fig. 5. At pH below 3 the enhanced acidity due to Ca++ disappears, since chelation with undissociated carboxyl groups is impossible. Nanninga (1954) has made a similar observation in the titration of L-meromyosin in the presence of Mg++. [Pg.175]

Temperature I temperature had a strong effect on trypsin and peroxidase, but only a weak effect on phosphatase and thrombin. [Pg.63]


See other pages where Effects on trypsin is mentioned: [Pg.35]    [Pg.677]    [Pg.622]    [Pg.525]   
See also in sourсe #XX -- [ Pg.607 ]




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