Involved in the organization of the secretory pathway. Required to maintain a functional Golgi apparatus. The M-Pol II complex possesses alpha-1,6-mannosyltransferase activity and is probably involved in the elongation of the mannan backbone of N-linked glycans on cell wall and periplasmic proteins. Component of the M-Pol II complex composed of ANP1, MNN9, MNN10, MNN11 and HOC1. Cis-Golgi (PubMed:9430634). Recycles between endoplasmic reticulum and Golgi (PubMed:11095735). Belongs to the ANP1/MMN9/VAN1 family.