PMID: 9654065Jul 8, 1998Paper

Cloning, purification and characterisation of the lipase from Staphylococcus epidermidis--comparison of the substrate selectivity with those of other microbial lipases

European Journal of Biochemistry
J W SimonsH M Verheij

Abstract

On the chromosome of Staphylococcus epidermidis RP62A the lipase gene (gehSE1) is immediately flanked by the icaAA'BC operon, which is involved in biofilm formation. Since lipase production might play a role in staphylococcal skin colonisation as well, we studied the biochemical properties of the staphylococcal lipases more closely. The DNA sequence and the deduced protein sequence revealed that gehSE1 is very similar to the lipase sequence of S. epidermidis strain 9. Like other staphylococcal lipases, gehSE1 is organised as a preproenzyme. The part of gehSE1 coding for the mature lipase was cloned and overexpressed as a fusion protein with an N-terminal histidine tag in Escherichia coli. The lipase was purified to homogeneity using a combination of precipitation techniques, metal-affinity chromatography and gel filtration. Biochemical characterisation showed that this lipase is closely related to the lipase from Staphylococcus aurelis NCTC8530. Both enzymes have a pH optimum around 6, are very stable at low pH, and need calcium as a cofactor for catalytic activity. The preferred substrates are small triacylglycerols, with a maximum activity toward tributyrylglycerol. Comparison of the substrate selectivity with those of other ...Continue Reading

Citations

Nov 19, 2011·Seminars in Immunopathology·Michael Otto
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