Merck, SAE0202-5X100UG, Mucinase StcE

Mucinase StcE is a metalloprotease that can be used to digest densely O-glycosylated mucins. The consensus sequence for cleavage is S/T*-X-S/T, where the cleavage happens on the amino side of the 2ⁿᵈ Serine/Threonine, and X can be any amino acid, or none though with lower efficiency. The P2 position (*) is found to be always occupied in cleavage products, and occupancy of both P1 and P1’ positions do not interfere with cleavage. While Mucinase StcE is active against Mucins and other mucin-domain containing glycoproteins such as CD43 or PSGL-1, it is not active against O-glycoproteins outside of the Mucin family, such as fetuin or GspB736flag¹.