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Characterization ofCardiobacterium hominis: Antibiotic susceptibility, morphological variations, plasmid and membrane analysis

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Abstract

Trypticase soy broth and Mueller Hinton broth lacking yeast extract resulted in morphological alterations (pleomorphism) ofCardiobacterium hominis, as demonstrated by light and transmission electron microscopy. Outer membrane protein profiles were influenced by the composition of growth media, especially in the region of porin proteins. In contrast, the protein composition of inner membranes was not influenced by media composition.C. hominis isolates tested were susceptible to 16 β-lactam antibiotics. All isolates exhibited minimal inhibitory concentrations of ≤1 µg/ml to 13 of the 16 β-lactams tested. The changes in outer membrane profiles induced by media composition did not influence susceptibility to β-lactam antibiotics. None of the isolates examined contained detectable plasmids, β-lactamase, or resistant mutants. Characteristic β-lactam-induced morphological defects were observed.

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Authors and Affiliations

  1. Upjohn Laboratories, Kalamazoo, Michigan

    Roger R. Hinshaw

  2. Department of Obstetrics and Gynecology, Saint Francis Medical Center, Peoria, Illinois

    Antoinette J. Render

  3. Department of Bacteriology, Northwestern Memorial Hospital, Chicago, Illinois, USA

    Suzanne L. Carver

  4. Department of Basic Sciences, University of Illinois College of Medicine at Peoria, P.O. Box 1649, 61656, Peoria, IL, USA

    Marcia A. Miller & Dianne F. Mockler

Authors
  1. Marcia A. Miller
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  2. Dianne F. Mockler
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  3. Roger R. Hinshaw
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  4. Antoinette J. Render
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  5. Suzanne L. Carver
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Miller, M.A., Mockler, D.F., Hinshaw, R.R. et al. Characterization ofCardiobacterium hominis: Antibiotic susceptibility, morphological variations, plasmid and membrane analysis. Current Microbiology 23, 197–205 (1991). https://doi.org/10.1007/BF02092279

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