- Nonclathrin coat protein gamma, a subunit of coatomer, binds to the cytoplasmic dilysine motif of membrane proteins of the early secretory pathway. Harter, C., Pavel, J., Coccia, F., Draken, E., Wegehingel, S., Tschochner, H., Wieland, F. Proc. Natl. Acad. Sci. U.S.A. (1996)