title: Binding of type-I collagen to Chlamydia trachomatis.
abstract: Denatured type-I collagen was found to bind to Chlamydia trachomatis elementary bodies (EBs) in a time-dependent and specific manner. Specificity was tested by having a large excess of other proteins present in the binding mixture. Only denatured type-I collagen efficiently competed for binding. Radiolabelled fibronectin did not bind under the test conditions used. The binding was temperature-dependent and the interaction increased at the melting temperature of the collagen. Evidence was found for two binding sites: one with high affinity (Kd 3.3 x 10(-9)) and one with low affinity (Kd 1.7 x 10(-7)), with an estimated number of binding sites per EB of 590 and 2900, respectively. The interaction between C. trachomatis and collagen may also be relevant in vivo, since 50% binding occurred at 37 degrees C. The binding to denatured collagen may be of importance for the development of sexually acquired reactive arthritis.
authors.affiliation: Institute of Clinical Bacteriology, University of Uppsala, Sweden.
authors.forename: G
authors.initials: G
authors.lastname: Fröman
authors.forename: K
authors.initials: K
authors.lastname: Amin
authors.forename: A
authors.initials: A
authors.lastname: Yacoub
authors.forename: P A
authors.initials: PA
authors.lastname: Mårdh
mesh_terms: D000818:Animals; D002460:Cell Line; D002692:Chlamydia trachomatis / Q000378:metabolism*; D003094:Collagen / Q000378:metabolism*; D005353:Fibronectins / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D011485:Protein Binding; D011489:Protein Denaturation; D013045:Species Specificity; D013696:Temperature
chemical_list: D005353:Fibronectins; D003094:Collagen