May play a role in cell-cell and cell-matrix interactions. This is a non-catalytic metalloprotease-like protein (By similarity). Can bind to LGI1 and LGI4. Brain specific. On 15 dpc embryo the level of isoform Gamma exceeded that of isoform Alpha and isoform Beta and decreased after birth. On P10 post neonatal, the level of isoform Gamma is undetectable and isoform Alpha and isoform Beta are expressed again.