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Responses of Haemophilus pleuropneumoniae to iron restriction: changes in the outer membrane protein profile and the removal of iron from porcine transferrin
Author(s) -
Niven D. F.,
Donga J.,
Archibald F. S.
Publication year - 1989
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/j.1365-2958.1989.tb00258.x
Subject(s) - biology , transferrin , bacterial outer membrane , haemophilus , microbiology and biotechnology , actinobacillus pleuropneumoniae , bacteria , biochemistry , escherichia coli , serotype , genetics , gene
Summary Outer membranes from Haemophilus pleuropneumoniae grown under iron‐replete and iron‐restricted conditions in vitro were analysed by means of SDS‐PAGE and immunoblotting. Iron restriction resulted in the appearance of two or more novel polypeptides in the molecular size range of 96–102 kD and an increased amount of a 79 kD polypeptide. These polypeptides were recognized by porcine immune sera indicating their production by H. pleuropnuemoniae during‘growth in vivo. Although soluble siderophore production could not be detected, growth of the organisms on an iron‐restricted medium was enhanced by the presence of porcine transferrin but not by bovine or human transferrin. The results suggest that H. pleuropneumoniae possesses a specific transferrin receptor, perhaps in the form of an iron‐regulated outer membrane protein.