Haemin binding as a factor in the virulence of Porphyromonas gingivalis.

Abstract:

:Haemin (iron protoporphyrin IX) is an essential growth factor for the periodontal pathogen. Porphyromonas gingivalis. Iron protoporphyrin IX (IPP IX) binding to the avirulent P. gingivalis beige variant (W50/BE1) and the black-pigmenting parent wild-type strain W50 was quantified. W50/BE1 grown in a chemostat under haemin excess-bound IPP IX under both oxidising and reducing conditions but with both lower capacity and avidity than either the haemin-limited- and haemin-excess-grown parent strain W50. Rosenthal plots for W50/BE1 indicated cooperative binding. W50/BE1 cells expressed a 32 kDa outer membrane haemin-binding protein when grown under conditions of haemin excess, and this strain might serve as a useful source from which to isolate this protein. The reduced IPP IX binding ability of W50/BE1 may be the rate-limiting factor for haem uptake and explain the reduced virulence and slower rate of pigmentation of this strain.

journal_name

FEMS Microbiol Lett

authors

Smalley JW,Birss AJ,McKee AS,Marsh PD

doi

10.1111/j.1574-6968.1996.tb08364.x

subject

Has Abstract

pub_date

1996-07-15 00:00:00

pages

65-70

issue

1

eissn

0378-1097

issn

1574-6968

pii

0378109796002091

journal_volume

141

pub_type

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