apolipoprotein B mRNA editing enzyme complex Protein complex that mediates editing of the mRNA encoding apolipoprotein B; catalyzes the deamination of C to U (residue 6666 in the human mRNA). Contains a catalytic subunit, APOBEC-1, and other proteins (e.g. human ASP; rat ASP and KSRP). GO:0030895 cellular_component apoB mRNA editing enzyme complex ASP = APOBEC1 complementation factor 1, a1cf, acf; KSRP = Khsrp (KH-type splicing regulatory protein) APOBEC mRNA editing complex nuclear protein-containing complex