[Isolation and characteristics of alpha-specific thrombin-like enzymes from venoms of the common pit viper (Agkistrodon halys halys) and the eastern pit viper (the central Asian subspecies Agkistrodon halys blomhoffii)].
Ancistron-H and Ancistron-B--two novel thrombin-like serine proteinases--have been purified 188- and 194-fold with a 95% recovery from the venoms of two Middle Asian subspecies of the pit viper--Agkistrodon halys halys and Agkistrodon halys Blomhoffii, using one-step affinity chromatography on agarose with an immobilized dye--Cibacron Blue F3GA (Blue-Sepharose 6B CL). The purified enzymes are one-chain glycoproteins with molecular masses of 34 and 29 kDa, pI of 6.6 and 6.3 and specific activities of 410 and 110 NIH units/mg protein, respectively. Their major amino acids are Gly, Val, Ser and Asp for Ancistron-H and Glu, Gly, Ser and Asp for Ancistron-B. During incubation with fibrinogen the enzymes cleave only the fibrinopeptide A from the A alpha-chain, leaving the B beta- and gamma-chains intact. Both enzymes hydrolyse arginine esters and thrombin-specific chromogenic peptide substrates, and display a weak caseinolytic activity but no fibrinolytic activity.
D A
DA
Solov'ev
T P
TP
Ugarova
D017836:Agkistrodon; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002846:Chromatography, Affinity; D003435:Crotalid Venoms / Q000201:enzymology*; D004591:Electrophoresis, Polyacrylamide Gel; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry / Q000378:metabolism; D012697:Serine Endopeptidases / Q000302:isolation & purification* / Q000378:metabolism; D013045:Species Specificity; D013379:Substrate Specificity; D013917:Thrombin / Q000378:metabolism*
D000596:Amino Acids; D003435:Crotalid Venoms; D010455:Peptides; D012697:Serine Endopeptidases; D013917:Thrombin