Cloning and Expression in Escherichia coli of a Synthetic DNA for Hirudin, the Blood Coagulation Inhibitor in the Leech

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Abstract
A 235-bp DNA coding for the leech blood coagulation inhibitor, hirudin, was chemically synthesized. The synthesis involved preparation of seven long oligodeoxyribonucleotide pairs which were assembled and clones using a rapid and simple procedure. More than half of the transformed Escherichia coli cells expressed a biosynthetic polypeptide having biological properties which were very similar to authentic hirudin from the leech Hirudo medicinalis. To achieve efficient expression, we fused the hirudin DNA to a truncated C1 repressor gene of bacteriophage .lambda. to create a hybrid protein. An additional methionine at the fusion point allowed the active hirudin to be cleaved off by cyanogen bromide.