The comparative study of three Neisseria meningitidis strains (15, 125, 2394) was carried out by the method of electrophoresis in polyacrylamide gel in the presence of sodium dodecyl sulfate and by the method of immunoblotting. The intensive expression of 8 iron-regulated proteins (IRP) was shown to occur in iron-deficient culture medium. The major IRP with a molecular weight of 35 kD was expressed by all above-mentioned N. meningitidis strains under the conditions of iron deficiency and cross-reacted with 10 mouse and rabbit antisera to N. meningitidis of different groups, i.e. it was common to all Neisseria species. The antigenic activity of various IRP essentially differed with respect to antisera of animals and sera of patients with meningococcal infection.
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