b-trypsin

Leupeptin is a competitive protease inhibitor produced by actinomycetes. Leupeptin can inhibit cysteine, serine and threonine peptidases. Leupeptin inhibits serine proteinases (trypsin (Ki=3.5 nM), plasmin (Ki= 3.4 nM), porcine kallikrein), and cysteine p

Leupeptin is a naturally occurring protease inhibitor that can inhibit cysteine, serine and threonine peptidases. Leupeptin is an organic compound produced by actinomycetes. Leupeptin inhibits serine proteinases (trypsin (Ki=3.5 nM), plasmin (Ki= 3.4 nM), porcine kallikrein), and cysteine proteinases (papain, cathepsin B (Ki = 4.1 nM), endoproteinase Lys-C). It does not inhibit α-chymotrypsin or thrombin. Leupeptin is a competitive transition state inhibitor and its inhibition may be relieved by an excess of substrate.

Aeruginosin 98-B为一种蛋白酶抑制剂，能够抑制胰蛋白酶、纤溶酶和凝血酶，其IC50值依次为0.6、7.0和10.0 μg mL。

Laccaridione B 能够抑制抗丝氨酸蛋白酶，其对胰蛋白酶、木瓜蛋白酶、嗜热蛋白酶、胶原酶和锌蛋白酶的IC50分别为10.9 μg/mL、5.1 μg/mL、8.4 μg/mL、5.7 μg/mL和3.0 μg/mL。此外，Laccaridione B 对L-929、K-562和HeLa细胞表现出显著的抗增殖活性，IC50分别为2.4 μg/mL、1.8 μg/mL和13.9 μg/mL。

Bacithrocin B 是凝血酶 (thrombin) 抑制剂，能够抑制凝血酶、Xa 因子、胰蛋白酶及木瓜蛋白酶，其IC50分别为 84 μM、17 μM、1.7 μM 和 0.02 μM。