Potentiometric studies on benzeneboronic acid-alpha-chymotrypsin interactions.

Abstract:

:When the competitive inhibitor benzeneboronic acid (BBA) forms a complex with alpha-chymotrypsin [EC 3.4.21.1] protons are released in the acidic pH region. The proton release can be measured by a difference potentiometric technique. The proton release is also observed in chymotrypsinogen A but not in TRCK-, DIP-, and anhydrochymotrypsins. Based on these observations, a simple procedure to estimate the equilibrium constants of the trigonal-tetrahedral interconversion of BBA is proposed. Thermodynamic parameters of the ionization of His 57 and of each step involved in BBA binding can be estimated from the temperature dependence of the proton release. Those of His 57 are essentially the same as those of imidazole in water. Regarding the interconversion of BBA on the enzyme, the value of delta S is similar to delta S not equal to of the deacylation step of nonspecific substrates, and delta H is remarkably reduced from that for the ionization of BBA in water. The enthalpic gain of enzymic process is suggested to be due to the change of the proton acceptor, which is water in the case of the ionization of BBA in water, to imidazole on the enzyme.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Hanai K

doi

10.1093/oxfordjournals.jbchem.a131036

subject

Has Abstract

pub_date

1976-01-01 00:00:00

pages

107-16

issue

1

eissn

0021-924X

issn

1756-2651

journal_volume

79

pub_type

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