O-antigen group O:43 polymerase yielding a very long O antigen chain length (100 repeat units)
100.0 udcdpglcnac_a1_3_galnac_b1_3_gal_a1_3_gal_a1_2_fuc_p ⇌ 99.0 udcpdp_p + OA43_VL_p