Evaluation of SDS-polyacrylamide Gel Systems for the Study of Outer Membrane Protein Profiles of Clinical Strains of Acinetobacter Baumannii

J Basic Microbiol. 2003;43(3):194-201. doi: 10.1002/jobm.200390022.


The outer membrane protein (OMP) profiles of 23 blood isolates of Acinetobacter baumannii representing all the different antimicrobial susceptibility patterns observed during a 3-year period in a Spanish hospital were studied. OMPs extracted from envelopes of sonicated cells after solubilisation with 2% of N-lauryl-sarcosinate were analysed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) using the Laemmli's buffers. Eight running gel systems differing in the concentration of polyacrylamide (8%, 10% and 12%) and in the absence or presence of urea (4 M and 6 M) were used in a preliminary study analysing the OMP profiles of four clonally unrelated strains of A. baumannii. When this study was completed, the OMPs of the 23 A. baumannii were analysed in 10% SDS-polyacrylamide gels with 6 M urea and in 12% SDS-polyacrylamide gels. Ten OMP profiles were observed in 10% SDS-polyacrylamide gels with 6 M urea, whereas only 5 OMP profiles were visualised using 12% SDS-polyacrylamide gels. The OMP profiles obtained in 10% SDS-polyacrylamide gels with 6 M urea only partially correlated with those observed in 12% SDS-polyacrylamide gels. In conclusion, the use of 10% SDS-polyacrylamide gels with 6 M urea is recommended for the study of OMP profiles of A. baumannii.

Publication types

  • Comparative Study
  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acinetobacter Infections / epidemiology
  • Acinetobacter Infections / microbiology
  • Acinetobacter baumannii / genetics
  • Acinetobacter baumannii / isolation & purification*
  • Bacterial Outer Membrane Proteins / analysis*
  • Bacterial Outer Membrane Proteins / chemistry
  • Bacterial Outer Membrane Proteins / isolation & purification
  • Detergents / chemistry
  • Electrophoresis, Polyacrylamide Gel*
  • Humans
  • Molecular Weight


  • Bacterial Outer Membrane Proteins
  • Detergents