Abstract
To clone cDNAs of thrombin-like enzymes (TLEs) from venom gland of Deinagkistrodon acutus and analyze the mechanisms by which their structural diversity arose. Reverse transcription-polymerase chain reaction and gene cloning techniques were used, and the cloned sequences were analyzed by using bioinformatics tools. Novel cDNAs of snake venom TLEs were cloned. The possibilities of post-transcriptional recombination and horizontal gene transfer are discussed. A phylogenetic tree was constructed. The cDNAs of snake venom TLEs exhibit great diversification. There are several types of structural variations. These variations may be attributable to certain mechanisms including recombination.
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