Loss of protective antigen, histamine-sensitising factor and envelope polypeptides in cultural variants of Bordetella pertussis.

Abstract:

:Five Bordetella pertussis strains of phase I were grown in conventional casamino-acid medium and in media modified by adding high concentrations of MgSO4 or nicotinic acid. Cells grown in high-magnesium media (in the C-mode) had only about 4% of the protective antigen (PA) and 6% of the histamine-sensitising factor (HSF) of cells from the normal medium. Envelopes from C-mode organisms when examined by SDS-PAGE showed a loss of 28K and 30K polypeptide bands. Similar parallel losses of PA, HSF and 28K and 30K bands were found with cells from the high-nicotinic-acid medium. A medium with a high concentration of nicotinamide gave cells with normal amounts of PA, HSF and 28K and 30K bands. Growth in high concentrations of Na2SO4 caused partial losses of PA, HSF and 28K and 30K bands, while a high-succinate medium gave cells with somewhat diminished PA and HSF but without appreciable attenuation of the 28K and 30K bands. Because of the close correlation between the presence or absence of PA, HSF and 28K and 30K envelope polypeptides, it is suggested that the latter may represent or be closely associated with the components responsible for PA and HSF activities.

journal_name

J Med Microbiol

authors

Wardlaw AC,Parton R,Hooker MJ

doi

10.1099/00222615-9-1-89

subject

Has Abstract

pub_date

1976-02-01 00:00:00

pages

89-100

issue

1

eissn

0022-2615

issn

1473-5644

journal_volume

9

pub_type

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