Extracellular lipase from Pseudomonas aeruginosa is an amphiphilic protein

Karl E. Jaeger, Franz J. Adrian, Helmut E. Meyer, Robert E.W. Hancock, Ulrich K. Winkler

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30 Citations (Scopus)


Lipase (triacylglycerol acylhydrolasse, EC secreted Pseudomonas aeruginosa PAC1R was purified from cell-free growth medium by preparative isoelectric focusing. After blotting the N-terminal amino acid sequence and the amino acid composition were determined and compared to P. fragi and P. cepacia lipases yielding significant homology between all three species. Additionally, a consensus sequence K-Y-P-i-v-l-V-H-G was identified residing at the N-terminus of Pseudomonas lipases and in the central part of Staphylococcus lipases. Treatment of lipase with the serine-specific inhibitor diethyl p-nitrophenyl phosphate caused a rapid and complete inhibition of enzyme activity indicating the presence of a serine at the catalytic site as expected from lipase consensus sequences. Upon charge-shift electrophoresis the electrophoretic mobility of purified lipase was shifted either anodally or cathodally in the presence of sodium deoxycholate and cetyltrimethylammoniumbromide, respectively. This result demonstrates that extracellular lipase of P. aeruginosa exhibits an amphiphilic character like intrinsic membrane proteins.

Original languageEnglish
Pages (from-to)315-321
Number of pages7
JournalBiochimica et Biophysica Acta (BBA)/Protein Structure and Molecular
Issue number3
Publication statusPublished or Issued - 17 Apr 1992
Externally publishedYes


  • (P. aeruginosa)
  • Charge-shift electrophoresis
  • Lipase
  • N-terminal amino acid sequence

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology

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