GlcN-acylPImannosyltransferase(dol12manp),endoplasmicreticulum(lumpedreaction)
4.0 dol12manp_r + gacpail_pf_18_0_18_1_16_0_r ⇌ 4.0 h_r + 4.0 dolp12_r + m4gacpail_pf_18_0_18_1_16_0_r