APOBEC is a family of evolutionary conserved proteins:

A mechanism of generating protein diversity is mRNA

Messenger RNA

Messenger RNA is a molecule of RNA encoding a chemical "blueprint" for a protein product. mRNA is transcribed from a DNA template, and carries coding information to the sites of protein synthesis: the ribosomes. Here, the nucleic acid polymer is translated into a polymer of amino acids: a protein...

 editing. Members of this family are C-to-U editing enzymes. The N-terminal domain of APOBEC like proteins is the catalytic domain, while the C-terminal domain is a pseudocatalyitc domain. More specifically, the catalytic domain is a zinc dependent cytidine deaminase domain and is essential for cytidine deamination. RNA editing by APOBEC-1 requires homodimerisation and this complex interacts with RNA binding proteins to from the editosome.

Family members

Human genes encoding members of the APOBEC protein family include:

• APOBEC1
• APOBEC2
• APOBEC3A
  APOBEC3A
  Apolipoprotein B mRNA editing enzyme, catalytic polypeptide-like 3A, also known as APOBEC3A, is a gene of the APOBEC3 family found in at least in humans.. It is a cytidine deaminase with antiviral effects...
  
  
• APOBEC3C
• APOBEC3D ("APOBEC3E" now refers to this)
• APOBEC3F
• APOBEC3G
  APOBEC3G
  APOBEC3G is a human enzyme encoded by the APOBEC3G gene that belongs to the APOBEC superfamily of proteins. This family of proteins has been suggested to play an important role in innate anti-viral immunity...
  
  
• APOBEC3H
• APOBEC4