| Modification Notes |
APOBEC3H (apolipoprotein B mRNA editing enzyme, catalytic polypeptide-like 3H), also known as ARP10, is a 200 amino acid protein that belongs to the cytidine and deoxycytidylate deaminase family. Highly expressed in ovary, testis, colon, cerebellum, skin and fetal liver, APOBEC3H uses zinc as a cofactor to catalyze the deamination of cytidine to produce uridine, a reaction that edits mRNA and increases protein diversity. Additionally, via its catalytic activity, APOBEC3H can inhibit retroviral replication and it is thought to play a role in intrinsic immune system defense mechanisms. Overexpression of APOBEC3H may be associated with the formation of tumors, suggesting a role for APOBEC3H in carcinogenesis. Two isoforms of APOBEC3H exist due to alternative splicing events. |