Antigenic relatedness and N-terminal sequence homology define two classes of periplasmic flagellar proteins of Treponema pallidum subsp. pallidum and Treponema phagedenis - PubMed (original) (raw)
Comparative Study
Antigenic relatedness and N-terminal sequence homology define two classes of periplasmic flagellar proteins of Treponema pallidum subsp. pallidum and Treponema phagedenis
S J Norris et al. J Bacteriol. 1988 Sep.
Abstract
The periplasmic flagella of many spirochetes contain multiple proteins. In this study, two-dimensional electrophoresis, Western blotting (immunoblotting), immunoperoxidase staining, and N-terminal amino acid sequence analysis were used to characterize the individual periplasmic flagellar proteins of Treponema pallidum subsp. pallidum (Nichols strain) and T. phagedenis Kazan 5. Purified T. pallidum periplasmic flagella contained six proteins (Mrs = 37,000, 34,500, 33,000, 30,000, 29,000, and 27,000), whereas T. phagedenis periplasmic flagella contained a major 39,000-Mr protein and a group of two major and two minor 33,000- to 34,000-Mr polypeptide species; 37,000- and 30,000-Mr proteins were also present in some T. phagedenis preparations. Immunoblotting with monospecific antisera and monoclonal antibodies and N-terminal sequence analysis indicated that the major periplasmic flagellar proteins were divided into two distinct classes, designated class A and class B. Class A proteins consisted of the 37-kilodalton (kDa) protein of T. pallidum and the 39-kDa polypeptide of T. phagedenis; class B included the T. pallidum 34.5-, 33-, and 30-kDa proteins and the four 33- and 34-kDa polypeptide species of T. phagedenis. The proteins within each class were immunologically cross-reactive and possessed similar N-terminal sequences (67 to 95% homology); no cross-reactivity or sequence homology was evident between the two classes. Anti-class A or anti-class B antibodies did not react with the 29- or 27-kDa polypeptides of T. pallidum or the 37- and 30-kDa T. phagedenis proteins, indicating that these proteins are antigenically unrelated to the class A and class B proteins. The lack of complete N-terminal sequence homology among the major periplasmic flagellar proteins of each organism indicates that they are most likely encoded by separate structural genes. Furthermore, the N-terminal sequences of T. phagedenis and T. pallidum periplasmic flagellar proteins are highly conserved, despite the genetic dissimilarity of these two species.
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