Analysis for molecular mechanism of contactin associated protein on intractable epilepsy

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To investigate the molecular mechanism for trafficking of Contactin-associated protein (Caspr) 2 to the cem membrane, we identified carboxypeptidase E (CPE) as a binding partner of Caspr2. Both Caspr2- and CPE-like immunoreactivities (IR) were found to co-localize in the apical dendrites and cell bodies of rat cortical neurons. In subcellular localization analysis, Caspr2- and CPE-like IRs were comigrated in the fractions of Golgi/ER. When Caspr2 cDNA was transfected into COS-7 cells with or without CPE cDNA, Caspr2 localized only in Golgi/ER without CPE, but localized in both Golgi/ER and plasma membrane with CPE. Our data suggest that CPE may be a key molecule to regulate Caspr2 trafficking to the cell membrane.