Segada LM, Lesse AJ. Creation of an isogenic P1-deficient mutant of Haemophilus influenzae biogroup aegyptius.
Gene X 1997;
204:185-94. [PMID:
9434183 DOI:
10.1016/s0378-1119(97)00545-3]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Haemophilus influenzae biogroup aegyptius, the causative agent of Brazilian purpuric fever (BPF), expresses a heat-modifiable 48 kDa outer membrane protein, P1, which is conserved in most Brazilian case-clone isolates. To study the role of P1 in pathogenesis of BPF we constructed via homologous recombination an isogenic P1-deficient mutant of H. influenzae biogroup aegyptius. The procedure involved a modification of Hererot's method for development of competence. Modifications included variations in the growth conditions, use of cAMP, specific characteristics of the donor DNA, and antibiotic selection. P1-deficient mutants were confirmed by SDS-PAGE, loss of reactivity with a specific monoclonal antibody on Western blot, restriction analysis and Southern blot. Our results establish the first successful transformation of homologous DNA into H. influenzae biogroup aegyptius.
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