purification of two antibacterial fraction of vipera lebetina venom

Purification of two antibacterial fraction of Vipera lebetina venom

Vipera lebetina venom contains all types of snake venom metalloproteases.

Snake venoms contain four classes of metalloproteases that all have a typical zinc-chelating sequence (HEXXHGXXH). N-terminal sequences and internal sequences of different purified metalloproteases were determined using Edman sequencing and LC MS/MS technique. Oligonucleotides were designed and used as primers for cDNA cloning from Vipera lebetina venom gland cDNA library. We found that isoform...

Identification of Fibrinolytic Activity in Iranian Vipera Lebetina Venom

Background and purpose: Vipera lebetina lives in different areas in Iran, and its venom contains a variety of proteins with coagulant and anticoagulant activities. Fibrinolytic enzymes could have a therapeutic role in dissolution of blood clots, so, this study aimed at separating the venom components of Iranian V. lebetina and detecting its anticoagulant activity. Materials and methods: In thi...

Proteases from Vipera lebetina venom affecting coagulation and fibrinolysis.

Our studies of the venom from the Levantine viper Vipera lebetina have demonstrated the existence of both coagulants and anticoagulants in the same venom. We showed that V. lebetina venom contains: (1) proteases that degrade fibrinogen, but not fibrin; (2) fibrinolytic enzyme (lebetase); (3) factor X activator (VLFXA); (4) factor V activator (VLFVA). Fibrinolytic enzyme and VLFXA are metallopro...

Anticoagulant serine fibrinogenases from Vipera lebetina venom: structure-function relationships.

Amino acid sequences of two anticoagulant serine fibrinogenases - alpha- and beta-fibrinogenase (VLAF and VLBF) from Vipera lebetina venom have been deduced from the cDNA sequences encoding the enzymes. The mature protein sequences of 234 amino acids (VLAF) and 233 amino acids (VLBF) exhibit significant similarity with other snake venom serine proteinases. Both enzymes contain the catalytic tri...

Effect of α-lipoic Acid on Hemolytic Activity of Iranian Vipera Lebetina Venom

Abstract Background and Objective: Snake venom is a complex of several toxic elements and enzymes. It has the agents with the ability to destroy cellular and subcellular membrane and to bring about hemolysis of red blood cells (RBC). Two types of direct and indirect hemolytic activity are known in snake venom in that phospholipase A2 is responsible for the indirect lysis. The aim of this st...