Arabinofuranan 3-O-arabinosyltransferase (, AftC) is an enzyme with systematic name alpha-(1->5)-arabinofuranan:trans,octacis-decaprenylphospho-beta-D-arabinofuranose 3-O-alpha-D-arabinofuranosyltransferase. This enzyme catalyses the following chemical reaction:
This enzyme is isolated from Mycobacterium smegmatis.