DNA deaminase (cytidine deaminase) which acts as an inhibitor of retrovirus replication and retrotransposon mobility via deaminase-dependent and -independent mechanisms. Selectively targets single-stranded DNA and does not deaminate double-stranded DNA or single- or double-stranded RNA. Exhibits antiviral activity against HIV-1, simian immunodeficiency viruses (SIVs), mouse mammary tumor virus (MMTV) and friend murine leukemia virus (FrMLV) and may inhibit the mobility of LTR retrotransposons. a 2'-deoxycytidine in single-stranded DNA + H(+) + H2O = a 2'-deoxyuridine in single-stranded DNA + NH4(+) Homodimer. Interacts with mouse mammary tumor virus (MMTV) nucleocapsid protein p14. Expressed in spleen, node and lung. The CMP/dCMP deaminase domain 1 confers deoxycytidine deaminase activity, whereas the CMP/dCMP deaminase domain 2 mediates RNA-dependent oligomerization and virion incorporation. Probable human APOBEC3G ortholog. Lacks exon V. Found in cell line MDTF. Belongs to the cytidine and deoxycytidylate deaminase family. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.