title: SDS-PAGE Analysis of the Outer Membrane Proteins of Uropathogenic Escherichia coli Isolated from Patients in Different Wards of Nemazee Hospital, Shiraz, Iran.
abstract: BACKGROUND
  Outer membrane proteins (OMPs) constitute the main structure and about half of the cell wall of Gram-negative bacteria. The OMPs of Escherichia coli (E. coli) play an important role in its drug resistance. Previous studies have shown that the OMPs of E. coli enhance its pathogenic effects by helping the bacterium to evade the immune defense and promote its adsorption to host cells. We sought to compare E. coli isolates collected from different hospital wards and to perform a primary investigation of the association between the serotypes and profiles of their OMPs. We also aimed to detect the diversity of the E. coli isolates from the hospitalized patients.
  
  
  METHODS
  A total of 115 isolates of E. coli were collected from patients hospitalized in Nemazee Hospital, Shiraz, Iran. After biochemical and serological tests, OMPs were extracted by using glass beads and N-Lauroylsarcosine sodium. OMP typing was done by 10% SDS-PAGE and Coomassie brilliant blue staining. In terms of the number of protein bands, OMP-I was detected with 2 bands, OMP-α with 3 bands, and OMP-β with1 band.
  
  
  RESULTS
  Of the 115 isolates, 103 were OMP-I and 12 were OMP-α; none of the isolates belonged to OMP-β. Our statistical analyses showed a relationship between OMP patterns and other factors, including hospital wards and source of samples. Serotyping showed that the majority of the isolates were O128.
  
  
  CONCLUSIONS
  Our results demonstrated some similarities between the OMP band patterns of the analyzed groups of E. coli. Of all the OMPs in the isolates from the hospitalized and outpatient department patients, OmpA and OmpC were the most prevalent proteins in the outer membrane of the studied uropathogenic E. coli.
authors: Department of Bacteriology and Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
authors: Behzad
authors: B
authors: Dehghani
authors: Department of Bacteriology and Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran; Shiraz HIV/AIDS Research Center Shiraz University of Medical Sciences, Shiraz, Iran.
authors: Mohammad
authors: M
authors: Mottamedifar
authors: Department of Bacteriology and Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
authors: Hossein
authors: H
authors: Khoshkharam-Roodmajani
authors: Department of Bacteriology and Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
authors: Amir
authors: A
authors: Hassanzadeh
authors: Basic Sciences in Infectious Disease Research Center, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
authors: Kamyar
authors: K
authors: Zomorrodian
authors: Department of Molecular Medicine, School of Advanced Medical Science and Technology, Shiraz University of Medical Sciences, Shiraz, Iran.
authors: Amir
authors: A
authors: Rahimi
keywords: Bacterial outer membrane proteins; Bacterial typing techniques; Electrophoresis; Escherichia coli; Polyacrylamide gel; Urinary tract infections