Combine toast crumbs, 1 cup sugar, cinnamon, and butter, mixing well. Firmly press mixture into bottom and halfway up sides of a 9-inch springform pan; set aside.
Beat cream cheese at medium speed of an electric mixer until light and fluffy; gradually add 3/4 cup sugar and flour, mixing well. Add egg yolks, sour cream, lemon rind, juice, and vanilla; mix well.
Beat egg whites (at room temperature) until stiff peaks form. Fold egg whites into cream cheese mixture.
Pour cheese mixture into crust. Bake at 375° for 5 minutes. Reduce heat to 300°; bake one hour and 10 minutes. Let cool to room temperature. Loosely cover, and refrigerate overnight. Remove sides of Springform pan before serving.