Molecular cloning and sequencing of the gene for a halophilic alkaline serine protease (halolysin) from an unidentified halophilic archaea strain (172P1) and expression of the gene in Haloferax volcanii

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Abstract
The gene of a halophilic alkaline serine protease, halolysin, from an unidentified halophilic archaea (archaebacterium) was cloned and its nucleotide sequence was determined. The deduced amino acid sequence showed that halolysin consists of 411 amino acids, with a molecular weight of 41,963. The highest homology was found with thermitase from Thermoactinomyces vulgaris. Halolysin has a long C-terminal extension of approximately 120 amino acids which has not been found in other extracellular subtilisin type serine proteases. The gene, hly, was expressed in another halophilic archaea, Haloferax volcanii, in a medium containing 18% salts by using a plasmid shuttle vector which has a novobiocin resistance determinant as a selectable marker.