Investigations of the esterase, phosphatase, and sulfatase activities of the cytosolic mammalian carbonic anhydrase isoforms I, II, and XIII with 4-nitrophenyl esters as substrates.

Abstract:

:The esterase, phosphatase, and sulfatase activities of carbonic anhydrase (CA, EC 4.2.1.1) isozymes, CA I, II, and XIII with 4-nitrophenyl esters as substrates was investigated. These enzymes show esterase activity with 4-nitrophenyl acetate as substrate, with second order rate constants in the range of 753-7706M(-1)s(-1), being less effective as phosphatases (k(cat)/K(M) in the range of 14.89-1374.40M(-1)s(-1)) and totally ineffective sulfatases. The esterase/phosphatase activities were inhibited by sulfonamide CA inhibitors, proving that the zinc-hydroxide mechanism responsible for the CO(2) hydrase activities of CAs is also responsible for their esterase/phosphatase activity. CA XIII was the most effective esterase and phosphatase. CA XIII might catalyze other physiological reactions than CO(2) hydration, based on its relevant phosphatase activity.

journal_name

Bioorg Med Chem Lett

authors

Innocenti A,Scozzafava A,Parkkila S,Puccetti L,De Simone G,Supuran CT

doi

10.1016/j.bmcl.2008.03.012

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

2267-71

issue

7

eissn

0960-894X

issn

1464-3405

pii

S0960-894X(08)00271-0

journal_volume

18

pub_type

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