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J Med Microbiol 57 (2008), 1058-1061; DOI: 10.1099/jmm.0.2008/001305-0
© 2008 Society for General Microbiology
ISSN 1473-5644

Differential glycosaminoglycan binding of Chlamydia trachomatis OmcB protein from serovars E and LGV

Sanaa Fadel1,2 and Adrian Eley1

1 Henry Wellcome Laboratories for Medical Research, School of Medicine and Biomedical Sciences, University of Sheffield Medical School, Sheffield S10 2RX, UK

2 Department of Microbiology, Faculty of Pharmacy, Cairo University, Egypt

Correspondence
Adrian Eley
a.r.eley{at}sheffield.ac.uk

Received 13 February 2008
Accepted 16 May 2008

We recently showed that OmcB protein from Chlamydia trachomatis serovar LGV1 functions as an adhesin. In this study, we produced Escherichia coli expressing OmcB from serovar E and compared this OmcB to OmcB from serovar LGV1. Infectivity inhibition assays carried out with serovars LGV1 and E of C. trachomatis in the presence of recombinant OmcB showed considerable (~60 %) inhibition of infectivity. In the presence of heparan sulphate, there was significant inhibition (68 %) of adherence of E. coli expressing OmcB from serovar LGV1 only. In a further experiment, recombinant OmcB from serovar LGV1 showed minimal binding to glycosaminoglycan (GAG)-deficient cells, whilst to the same cells, recombinant OmcB from serovar E showed binding equal to that to the wild-type cells. Our experiments strongly suggest that OmcB from serovar E, in contrast to that from serovar LGV1, is not binding to host cells through a GAG-dependent mechanism.

Abbreviations: GAG, glycosaminoglycan.






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