The present invention relates to compositions and methods for providing a recombinant thermostable Thermotoga neapolitana alkaline phosphatase enzyme. More particularly, the invention relates to engineering Escherichia coli with T. neapolitana alkaline phosphatase gene expression vectors for providing an inducible system for thermostable enzyme production, wherein the expressed enzyme is readily soluble with a high degree of activity. These methods provide for commercial quantities of a thermostable alkaline phosphatase enzyme.
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