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. 1986 Oct;54(1):109–117. doi: 10.1128/iai.54.1.109-117.1986

Heat-modifiable envelope proteins of Bordetella pertussis.

S K Armstrong, C D Parker
PMCID: PMC260124  PMID: 2875949

Abstract

Several envelope proteins of Bordetella pertussis demonstrated differences in electrophoretic mobility, depending upon solubilization temperature before sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These proteins were exposed on the cell surface as judged by their accessibility to radiolabeling with 125I. Monoclonal antibodies to two of the heat-modifiable proteins (Mrs of 18,000 and 91,000) reacted with intact cells in immunofluorescence microscopy experiments, also indicating surface exposure of these two proteins. Two-dimensional gel electrophoresis revealed that two heat-modifiable proteins (a major protein with an Mr of 38,000 and one with an Mr of 18,000) migrated as higher-Mr moieties when solubilized at low temperatures (25 degrees C). Three proteins (Mrs of 91,000, 32,000, and 30,000) and possibly a fourth (31,000) migrated as lower-Mr species when solubilized at 25 degrees C, as revealed in the two-dimensional gel system; these three proteins were found only in virulent B. pertussis and were not detected in a phase IV avirulent strain nor in a strain modulated to phenotypic avirulence by growth in nicotinic acid. The 38,000 molecular-weight protein (38K protein) and a 25K protein were found to be noncovalently associated with the underlying peptidoglycan. Small amounts of the 91K and 18K proteins were also found associated with peptidoglycan.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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