diff --git a/rpg/enzymes_definition.py b/rpg/enzymes_definition.py
index 8c10880fad623eef8ddb60b56cfad1cf363abbed..2f5d9bbf938b58c77df37a536929e373b57632b0 100644
--- a/rpg/enzymes_definition.py
+++ b/rpg/enzymes_definition.py
@@ -1771,3 +1771,16 @@ ENZYME = enzyme.Enzyme(CPT_ENZ, "Asp-N Endopeptidase", ENZ, 0)
 # Add it to available enzymes
 AVAILABLE_ENZYMES.append(ENZYME)
 CPT_ENZ += 1
+
+
+
+# ProAlanase Sequencing Grade
+# https://france.promega.com/products/mass-spectrometry/proteases-and-surfactants/proalanase-mass-spec-grade?catNum=VA2161
+# RULES: after A or P
+ENZ = []
+ENZ.append(rule.Rule(0, "A", True, 1))
+ENZ.append(rule.Rule(0, "P", True, 1))
+ENZYME = enzyme.Enzyme(CPT_ENZ, "ProAlanase", ENZ, 0)
+# Add it to available enzymes
+AVAILABLE_ENZYMES.append(ENZYME)
+CPT_ENZ += 1