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A strongly fibrinolytic enzyme was purified from Bacillus amyloliquefaciens Jxnuwx-1, found in Chinese traditional fermented black soya bean (douchi). The molecular mass of the enzyme, estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), was 29 kDa. The optimal pH and temperature for the enzyme were 7.6 and 41°C, respectively. The enzyme was inhibited by phenylmethylsulfonyl fluoride, soybean trypsin inhibitor, ethylenediaminetetraacetic acid, Fe 3+ , and Fe 2+ . The highest affinity exhibited by the enzyme was towards N-Succinyl-Ala-Ala-Pro-Phe-pNA. These results indicated that it is a subtilisin-like serine metalloprotease. The enzyme degraded both fibrinogen and fibrin, displaying its highest degrading activity towards the Aα-chains followed by Bβ chains and Cγ chains. The enzyme was also activated by plasminogen, indicating its ability to degrade fibrinogen and fibrin in two ways: (a) by activating plasminogen conversion into plasmin, or (b) by direct hydrolysis. It degraded thrombin, suggesting that it may act as an anticoagulant to prevent thrombosis. Taken together, our results indicate the potential of this enzyme in controlling cardiovascular disease.

journal of general and applied microbiology

Genome sequencing, purification, and biochemical characterization of a strongly fibrinolytic enzyme from &lt;i&gt;Bacillus amyloliquefaciens&lt;/i&gt; Jxnuwx-1 isolated from Chinese traditional douchi