Identification of prolyl oligopeptidase as a cyclosporine-sensitive protease by screening of mouse liver extracts
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Alexander Rentzsch
, Viktoria Kahlert , Günther Jahreis , Bernhard Schlott , Mike Schutkowski , Miroslav Malešević and Gunter Fischer
Abstract
Cyclosporine A (CsA) is a cyclic undecapeptide well known for its ability to prevent rejection episodes after organ transplantation via gain-of-function. Therefore, biomedical studies on CsA have been focused on both immunosuppressive properties and binding to the biocatalytically-active immune receptors, the cyclophilins. Much less attention has been spent on effects of cyclosporines on the biological function of other proteins. We used a 9-mer fluorescence-quenched peptide library with defined sequences to identify cyclosporine-sensitive proteolysis in mouse liver extracts. A highly soluble [d-Ser]8-CsA derivative was utilized to avoid drug precipitation at extended incubation times. Analysis of the time courses of proteolysis revealed 15 out of 360 peptide sequences where proteolysis exhibited marked sensitivity to the cyclosporine derivative. As a first example, a collagen-derived substrate was selected from those hits to identify the targeted proteolytic pathway. After purification from mouse liver extracts, prolyl oligopeptidase (EC 3.4.21.26) could be identified as a protease sensitive to submicromolar concentrations of cyclosporines. Surprisingly, in a series of cyclosporine derivatives an inverse relationship was found between the inhibition of prolyl oligopeptidase and inhibition of cyclophilin A.
We thank Michael Schumann and Klaus Peter Rücknagel for measurements of PPIase activity, Cordelia Schiene-Fischer for kindly providing SUMO protease and Angelika Schierhorn for mass spectrometry. This project was supported by the Deutsche Forschungsgemeinschaft SFB610-TP A4 and BMBF ProNet-T3.
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©2013 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Masthead
- Masthead
- Guest Editorial
- Highlight: Protein states with cell biological and medicinal relevance
- HIGHLIGHT: PROTEIN STATES WITH CELL BIOLOGICAL AND MEDICAL RELEVANCE
- Towards improved receptor targeting: anterograde transport, internalization and postendocytic trafficking of neuropeptide Y receptors
- Progress in demystification of adhesion G protein-coupled receptors
- The unresolved puzzle why alanine extensions cause disease
- Molecular function of the prolyl cis/trans isomerase and metallochaperone SlyD
- Structure and allosteric regulation of eukaryotic 6-phosphofructokinases
- Polyionic and cysteine-containing fusion peptides as versatile protein tags
- p0071/PKP4, a multifunctional protein coordinating cell adhesion with cytoskeletal organization
- Lysine-specific histone demethylase LSD1 and the dynamic control of chromatin
- Methylation of the nuclear poly(A)-binding protein by type I protein arginine methyltransferases – how and why
- Oxidative in vitro folding of a cysteine deficient variant of the G protein-coupled neuropeptide Y receptor type 2 improves stability at high concentration
- Identification of prolyl oligopeptidase as a cyclosporine-sensitive protease by screening of mouse liver extracts
- In vitro maturation of Drosophila melanogaster Spätzle protein with refolded Easter reveals a novel cleavage site within the prodomain
- Subcellular localization and RNP formation of IGF2BPs (IGF2 mRNA-binding proteins) is modulated by distinct RNA-binding domains
- High level expression of the Drosophila Toll receptor ectodomain and crystallization of its complex with the morphogen Spätzle
Articles in the same Issue
- Masthead
- Masthead
- Guest Editorial
- Highlight: Protein states with cell biological and medicinal relevance
- HIGHLIGHT: PROTEIN STATES WITH CELL BIOLOGICAL AND MEDICAL RELEVANCE
- Towards improved receptor targeting: anterograde transport, internalization and postendocytic trafficking of neuropeptide Y receptors
- Progress in demystification of adhesion G protein-coupled receptors
- The unresolved puzzle why alanine extensions cause disease
- Molecular function of the prolyl cis/trans isomerase and metallochaperone SlyD
- Structure and allosteric regulation of eukaryotic 6-phosphofructokinases
- Polyionic and cysteine-containing fusion peptides as versatile protein tags
- p0071/PKP4, a multifunctional protein coordinating cell adhesion with cytoskeletal organization
- Lysine-specific histone demethylase LSD1 and the dynamic control of chromatin
- Methylation of the nuclear poly(A)-binding protein by type I protein arginine methyltransferases – how and why
- Oxidative in vitro folding of a cysteine deficient variant of the G protein-coupled neuropeptide Y receptor type 2 improves stability at high concentration
- Identification of prolyl oligopeptidase as a cyclosporine-sensitive protease by screening of mouse liver extracts
- In vitro maturation of Drosophila melanogaster Spätzle protein with refolded Easter reveals a novel cleavage site within the prodomain
- Subcellular localization and RNP formation of IGF2BPs (IGF2 mRNA-binding proteins) is modulated by distinct RNA-binding domains
- High level expression of the Drosophila Toll receptor ectodomain and crystallization of its complex with the morphogen Spätzle