Fibrinogenolytic toxin from Indian monocled cobra (Naja kaouthia) venom.
J Biosci
;
2011 Jun; 36(2): 355-361
Article
in English
| IMSEAR
| ID: sea-161556
ABSTRACT
A fibrinogenolytic toxin of molecular weight 6.5 kDa has been purified from the venom of Indian monocled cobra (Naja kaouthia) by repeated cation exchange chromatography on CM-sephadex C-50. The purified toxin did not show any phospholipase activity but was mildly hemolytic on human erythrocytes. This toxin, called Lahirin, cleaved fibrinogen in a dose- and time-dependent manner. The digestion process apparently started with the Aα chain, and gradually other lower-molecular-weight chains were also cleaved to low-molecular-weight peptides. The fibrinolytic activity was completely lost after treatment with ethylene di-amine tetra acetic acid (EDTA). However, exposure to 100°C for 1 min or pre-treatment with phenyl methyl sulfonyl fluoride (PMSF) did not affect the fibrinolytic activity. Cleavage of di-sulphide bonds by β-mercaptoethanol or unfolding the protein with 4 M urea caused complete loss of activity of pure Lahirin.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Language:
English
Journal:
J Biosci
Year:
2011
Type:
Article
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