Protein & Peptide Letters

Prof. Ben M. Dunn  
Department of Biochemistry and Molecular Biology
University of Florida
College of Medicine
P.O. Box 100245
Gainesville, FL


Distinct Cleavage Specificity of Human Cathepsin E at Neutral pH with Special Preference for Arg-Arg Bonds

Author(s): Senarath B.P. Athauda and Kenji Takahashi

Affiliation: School of Life Science, Tokyo University of Pharmacy and Life Science,Hachioji, Tokyo 192-0392, Japan

Keywords: Cathepsin E, RCm-ribonuclease, Tyr-X bonds, Lys-Lys bonds, Glu-X bonds


In order to clarify the potential role of cathepsin E at neutral pH, the cleavage specificity of human cathepsin E was examined at pH 7.4 toward reduced-carboxymethylated(RCm-)ribonuclease A and various bioactive and related peptides. The specificity of the enzyme at pH 7.4 was found to be considerably different from that at acidic pH preferential cleavages were observed with Arg-X and Glu-X bonds, which are not the major cleavage sites at acidic pH. Moreover, the Arg-Arg bond was found to be the most preferential site of cleavage. This unique specificity observed at pH 7.4 suggests the possibility that cathepsin E might be involved in processing and/or degradation of certain proteins and / or peptides at or near neutral pH in vivo.

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Article Details

Page: [15 - 22]
Pages: 8
DOI: 10.2174/0929866023408940