Definition of the critical domains required for homophilic targeting of mouse sidekick molecules Kayo Hayashi * ,† ,1 , Lewis Kaufman * , Michael D. Ross * and Paul E. Klotman * * Division of Nephrology, Mt. Sinai School of Medicine, New York, New York, USA; and † Division of Nephrology, Department of Internal Medicine, Juntendo University School of Medicine, Tokyo, Japan 1 Correspondence: Division of Nephrology, Mount Sinai School of Medicine, Annenberg Bldg., Room 23-38 One Gustave L. Levy Pl., New York, NY 10029, USA. E-mail: kayo.hayashi@mssm.edu <h3>SPECIFIC AIMS</h3> Homophilic binding of mouse sidekick-1 and sidekick-2 proteins, orthologous transmembrane proteins of the immunoglobulin superfamily, has been shown to be important in targeting and stabilizing the developing neuronal synapse and in the pathogenesis of HIV-associated nephropathy. The aims of the current work were to: 1) characterize the homophilic binding properties of sidekick molecules in cells; and 2) define the critical domains responsible for targeting and stabilizing these homophilic interactions. <h3>PRINCIPAL FINDINGS</h3> 1. <h3>Sidekicks mediate homophilic adhesion</h3> To determine whether homophilic binding by sidekicks mediates cell adhesion, we cloned murine sidekicks 1 and 2. Sidekick proteins were then overexpressed in HEK 293T cells and cell aggregation assays were performed.
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