diff --git a/rpg/enzymes_definition.py b/rpg/enzymes_definition.py
index b045e5b81bbd81ad44d8d64b49154be69beda733..e545f410930a027caf9924f81f0ec3d7321b4f0f 100644
--- a/rpg/enzymes_definition.py
+++ b/rpg/enzymes_definition.py
@@ -1801,3 +1801,18 @@ ENZYME = enzyme.Enzyme(CPT_ENZ, "Elastase", ENZ, 0)
 # Add it to available enzymes
 AVAILABLE_ENZYMES.append(ENZYME)
 CPT_ENZ += 1
+
+
+
+# α-Lytic
+# https://www.neb.com/en/products/p8113-a-lytic-protease#Product%20Information
+# RULES: after T, A, S or V
+ENZ = []
+ENZ.append(rule.Rule(0, "T", True, 1))
+ENZ.append(rule.Rule(0, "A", True, 1))
+ENZ.append(rule.Rule(0, "S", True, 1))
+ENZ.append(rule.Rule(0, "V", True, 1))
+ENZYME = enzyme.Enzyme(CPT_ENZ, "aLP", ENZ, 0)
+# Add it to available enzymes
+AVAILABLE_ENZYMES.append(ENZYME)
+CPT_ENZ += 1