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In this work, a metagenomic library was generated from peat-swamp forest soil obtained from Narathiwat Province, Thailand. From a fosmid library of approximately 15,000 clones, six independent clones were found to possess lipolytic activity at acidic pH. Analysis of pyrosequencing data revealed six ORFs, which exhibited 34-71% protein similarity to known lipases/esterases. A fosmid clone, designated LP8, which demonstrated the highest level of lipolytic activity under acidic conditions and demonstrated extracellular activity, was subsequently subcloned and sequenced. The full-length lipase/esterase gene, estPS2, was identified. Its deduced amino acid was closely related to a lipolytic enzyme of an uncultured bacterium, and contained the highly conserved motif of a hormone-sensitive family IV lipase. The EstPS2 enzyme exhibited highest activity toward p-nitrophenyl butyrate (C⁴) at 37 °C at pH 5, indicating that it was an esterase with activity and secretion characteristics suitable for commercial development.

Identification and Characterization of Lipolytic Enzymes from a Peat-Swamp Forest Soil Metagenome