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The Cbl family of proteins downregulate epidermal growth factor receptor (Egfr) signaling via receptor internalization and destruction. These proteins contain two functional domains, a RING finger domain with E3 ligase activity, and a proline rich domain mediating the formation of protein complexes. The Drosophila cbl gene encodes two isoforms, D-CblS and D-CblL. While both contain a RING finger domain, the proline rich domain is absent from D-CblS. We demonstrate that expression of either isoform is sufficient to rescue both the lethality of a D-cbl null mutant and the adult phenotypes characteristic of Egfr hyperactivation, suggesting that both isoforms downregulate Egfr signaling. Interestingly, targeted overexpression of D-CblL, but not D-CblS, results in phenotypes characteristic of reduced Egfr signaling and suppresses the effect of constitutive Egfr activation. The level of D-CblL was significantly correlated with the phenotypic severity of reduced Egfr signaling, suggesting that D-CblL controls the efficiency of downregulation of Egfr signaling. Furthermore, reduced dynamin function suppresses the effects of D-CblL overexpression in follicle cells, suggesting that D-CblL promotes internalization of activated receptors. D-CblL is detected in a punctate cytoplasmic pattern, whereas D-CblS is mainly localized at the follicle cell cortex. Therefore, D-CblS and D-CblL may downregulate Egfr through distinct mechanisms.
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