Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10820451 | Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology | 2011 | 8 Pages |
Abstract
A new protease named NJP with fibrinolytic activity was isolated from Neanthes japonica (Izuka), by a combination of ammonium sulfate fractionation, hydrophobic chromatography, ion-exchange chromatography and gel filtration. The molecular mass of NJP was approximately 28.6-33.5 kDa as estimated by MALDI-TOF mass spectrometry and SDS-PAGE, which revealed a monomeric form of the protease. The isoelectric point of NJP determined by 2-DE was 9.2. NJP was stable in the range of pH 7.0-11.0 with a maximum enzymatic activity at 40 °C and pH 9.0. The hydrolyzing activity of NJP on fibrinogen started from the Aα-chain, followed by the Bβ-chain, and the γ-chain at last. NJP had also a higher specificity for the chromogenic substrate S-2238 for thrombin. NJP activity was completely inhibited by PMSF. Analysis of partial amino acid sequences showed that NJP had very low homology with other known fibrinolytic enzymes. These results indicate that NJP is a novel alkaline thrombin-like serine protease. Thus NJP may have potential applications in the prevention and treatment of thrombosis.
Keywords
Alkaline serine proteaseSBTIMALDI-TOF-TOFEGTA2-DEPMSFIEFBSAbovine serum albuminEDTAethylenediamine tetraacetic acidTwo-dimensional electrophoresissodium dodecyl sulfate-polyacrylamide gel electrophoresisSDS-PAGEisoelectric focusingmatrix-assisted laser desorption ionization-time of flightFibrinogenolytic activityFibrinolytic activityphenylmethylsulfonyl fluoridesoybean trypsin inhibitorPurification
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Authors
Shaohua Wang, Zhihui Deng, Qi Li, Xin Ge, Qiqing Bo, Jiankai Liu, Jiayue Cui, Xi Jiang, Jia Liu, Lianzhi Zhang, Min Hong,