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. 1992 Apr;174(8):2425–2430. doi: 10.1128/jb.174.8.2425-2430.1992

Identification of two iron-repressed periplasmic proteins in Haemophilus influenzae.

R E Harkness 1, P Chong 1, M H Klein 1
PMCID: PMC205877  PMID: 1556062

Abstract

Protein expression by Haemophilus influenzae under iron-limiting growth conditions was examined. The five type b strains and four nontypeable strains studied all expressed a new protein of about 40 kDa when deprived of iron during growth. Most strains also expressed a protein of about 31 kDa under the same growth conditions. Both the 40- and 31-kDa proteins were not expressed by cells grown in iron-replete medium. The 40- and 31-kDa proteins were not expressed in iron-deficient medium to which an excess of ferric nitrate had been added, and therefore it was concluded that their expression was iron regulated. These iron-repressed proteins were localized to the periplasmic space. The amino-terminal sequences of both proteins were determined. The N-terminal sequence of the 40-kDa protein had 81% similarity to the N terminus of Fbp, the major iron-binding protein of Neisseria gonorrhoeae and N. meningitidis. The 31-kDa protein sequence showed no homology with any known protein sequence. As no plasmids were found in the strains, it was concluded that these proteins were chromosomally encoded.

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Selected References

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