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The high stability of cruzipain against pH-induced inactivation is not dependent on its C-terminal domain

Authors
Journal
FEBS Letters
0014-5793
Publisher
Wiley Blackwell (John Wiley & Sons)
Publication Date
Volume
469
Issue
1
Identifiers
DOI: 10.1016/s0014-5793(00)01221-7
Keywords
  • Cruzipain
  • Lysosomal Cysteine Protease
  • Cathepsin
  • Ph-Stability
  • Trypanosoma Cruzi

Abstract

Abstract Unlike mammalian lysosomal cysteine proteases, the trypanosomal cysteine protease cruzipain contains a 130-amino acid residue C-terminal domain, in addition to the catalytic domain, and it is stable at neutral pH. The endogenous (with C-terminal domain) and recombinant (without C-terminal domain) cruzipains exhibit similar stabilities at both acid (k inac=3.1×10 −3 s −1 and 4.4×10 −3 s −1 at pH 2.75 for endogenous and recombinant cruzipain, respectively) and alkaline pH (k inac=3.0×10 −3 s −1 and 3.7×10 −3 s −1 at pH 9.15 for endogenous and recombinant cruzipain, respectively). The pH-induced inactivation, which is a highly pH dependent first order process, is irreversible and accompanied by significant changes of secondary and tertiary structure as revealed by circular dichroism measurements. The different stability of cruzipain as compared to related proteases, is therefore due mainly to the different number, nature and distribution of charged residues within the catalytic domain and not due to addition of the C-terminal domain.

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