Tolloid Like Protein 2 (TLL2)

TLL2 encodes an astacin-like zinc-dependent metalloprotease and is a subfamily member of the metzincin family. Unlike other family members, a similar protein in mice does not cleave procollagen C-propeptides or chordin.TLL2 shares 80.3% amino acid sequence identity with BMP1, including 870 overlapping residues. Analysis by RT-PCR ELISA demonstrated weak expression of TLL2 in most tissues and moderate expression in heart and brain.TLL2 encodes a deduced 1,015-amino acid protein with a molecular mass of 120 kD by SDS/PAGE.Whereas BMP1, TLD, and TLL1 specifically process procollagen C-propeptides at the physiologically relevant site, TLL2 lacks this activity. BMP1 and TLL1 cleave chordin, but TLL2 and TLD do not.