6533b7d8fe1ef96bd126ae6b
RESEARCH PRODUCT
An impaired peroxisomal targeting sequence leading to an unusual bicompartmental distribution of cytosolic epoxide hydrolase
Michael KnehrFranz OeschHans-dieter ZellerHelmut ThomasMichael Arandsubject
MaleSignal peptidePTSanimal structures1303 BiochemistryMolecular Sequence DataBiophysics10050 Institute of Pharmacology and Toxicology610 Medicine & healthTripeptideProtein Sorting SignalsBiologyMicrobodiesBiochemistryAmino acid sequence1307 Cell BiologyCytosol1315 Structural Biology1311 GeneticsStructural BiologyComplementary DNAGenetics1312 Molecular BiologyAnimalsCloning MolecularEpoxide hydrolaseMolecular BiologyPeptide sequenceEpoxide Hydrolaseschemistry.chemical_classificationBase SequencecDNA sequenceDNACell BiologyPeroxisomeMolecular biologyRatsIsoenzymesCytosolPCREnzymeLiverchemistryBiochemistrycEH570 Life sciences; biologyPeptide analysis1304 Biophysicsdescription
AbstractTo gain an understanding of the mechanism by which the subcellular distribution of cytosolic epoxide hydrolase (cEH) is directed, we have analyzed the carboxy terminal region of rat liver cEH by means of cDNA cloning to define the structure of its possible peroxisomal targeting sequence (PTS). Purified cEH was subjected to peptide analysis following endoproteinase Glu-C digestion and HPLC-separation of the fragments. The obtained sequence information was used to perform PCR experiments resulting in the isolation of a 680 bp cDNA clone encoding the carboxy terminus of cEH. The deduced amino acid sequence displays a terminal tripeptide Ser-Lys-Ile which is highly homologous to the PTS (Ser-Lys-Leu) found in other peroxisomal enzymes. This slight difference appears to be sufficient to convert the signal sequence into an impaired and therefore ambivalent PTS, directing the enzyme partly to the peroxisomes and allowing part to reside in the cytosol.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1991-12-02 |