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A genomic library of Bartonella bacilliformis was constructed and screened with human anti-Bartonella serum from a patient with the chronic, verruga peruana phase of bartonellosis. An immunoreactive clone isolated from this library was found to code for a 591-amino-acid protein with a high degree of sequence similarity to the FtsZ family of proteins. The degree of amino acid identity between the B. bacilliformis protein (FtsZ[Bb]) and the other FtsZ proteins is especially pronounced over the N-terminal 321 amino acids (N-terminal domain) of the sequence, with values ranging from 45% identity for the homolog from Micrococcus luteus (FtsZ[Ml]) to 91% identity for the homolog from Rhizobium melliloti, (FtsZ[Rm1]). All of the functional domains required for FtsZ activity are conserved in FtsZ(Bb) and are located within the N-terminal domain of the protein. FtsZ(Bb) is approximately twice as large as most of the other FtsZ proteins previously reported, a property it shares with FtsZ(Rm1). Like the Rhizobium homolog, FtsZ(Bb) has a C-terminal region of approximately 256 amino acids that is absent in the other FtsZ proteins. Evidence is presented that implicates this region in the protein's antigenicity and suggests that, unlike most other FtsZ homologs, FtsZ(Bb) is at least partly exposed at the cell surface. PCR analysis revealed that an ftsZ gene similar in size to the B. bacilliformis gene is present in Bartonella henselae, a bacterium that is closely related to B. bacilliformis.

The 75-kilodalton antigen of Bartonella bacilliformis is a structural homolog of the cell division protein FtsZ