Component of the exomer complex%3B the exomer which also contains Csh6p%2C Bch1p%2C Bch2p%2C and Bud7%2C is involved in the export of select proteins%2C such as chitin synthase Chs3p%2C from the Golgi to the plasma membrane%3B interacts selectively with the activated%2C GTP-bound form of Arf1p%3B Chs5p is the only protein with a BRCT domain that is not localized to the nucleus
