A metalloexopeptidase is a type of enzyme that acts as a metalloproteinase exopeptidase.
These enzymes have a catalytic mechanism involving a metal, often zinc.
Analogous to slicing the end off a loaf of bread, the process releases a single amino acid (or dipeptide) for use.
These peptidases specifically target the C-terminus, the unbound carboxyl group (-COOH) at one distinct end of the amino acid chain (cutting one side from a loaf of bread rather than the end).
[1] Examples of these compounds in the human genome include AGBL1 and AGBL2, known also as ATP/GTP Binding Protein-Like 1 and 2, respectively.