Preheat oven to 350F (175C). Grease and flour a 13x9 steel pan. Set aside. Combine margerine, cake mix, and coconut until crumbly in a medium bowl. Cover the bottom of prepared pan with this mixture, spreading even and patting down, building up edges to form crust. Place apple wedges on top. Arrange evenly. Combine cinnamon and sugar, and sprinkle over apples. Combine sour cream and egg in a small bowl. Drizzle sour cream mixture on top of the cake. Bake for 35 minutes or until apples are tender and edges are golden.