Abstract
A proteinaceous hemolysin secreted by strain 4074 of serotype 1 of Actinobacillus pleuropneumoniae was purified by diafiltration and ion exchange chromatographic techniques. The hemolytic activity is associated with a 107-kDa band as assessed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis and confirmed by Western blotting and immunoprecipitation. This hemolysin produces pores in membranes as demonstrated by osmotic protection studies using red blood cells and carbohydrate compounds of various molecular weights. These assays suggest a pore diameter in the order of 2 nm. Phospholipid bilayers composed of 1:1 w/w phosphotidylserine:phosphotidylethanolamine exposed to this toxin display discrete current flow events typical of transmembrane channels and consistent with the interpretation that this toxin acts by forming pores in phospholipid membranes. The linear relationship of current amplitude to holding potential when examined over the -60 to +60 mV range indicates that this pore has a constant mean single channel conductance level of 350-400 pS.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 13559-13564 |
| Number of pages | 6 |
| Journal | Journal of Biological Chemistry |
| Volume | 264 |
| Issue number | 23 |
| State | Published - 1989 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Biochemistry
Cite this
Identification of a hemolysin from Actinobacillus pleuropneumoniae and characterization of its channel properties in planar phospholipid bilayers. / Lalonde, G.; McDonald, T. V.; Gardner, P.; O'Hanley, P. D.
In: Journal of Biological Chemistry, Vol. 264, No. 23, 1989, p. 13559-13564.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Identification of a hemolysin from Actinobacillus pleuropneumoniae and characterization of its channel properties in planar phospholipid bilayers
AU - Lalonde, G.
AU - McDonald, T. V.
AU - Gardner, P.
AU - O'Hanley, P. D.
PY - 1989
Y1 - 1989
N2 - A proteinaceous hemolysin secreted by strain 4074 of serotype 1 of Actinobacillus pleuropneumoniae was purified by diafiltration and ion exchange chromatographic techniques. The hemolytic activity is associated with a 107-kDa band as assessed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis and confirmed by Western blotting and immunoprecipitation. This hemolysin produces pores in membranes as demonstrated by osmotic protection studies using red blood cells and carbohydrate compounds of various molecular weights. These assays suggest a pore diameter in the order of 2 nm. Phospholipid bilayers composed of 1:1 w/w phosphotidylserine:phosphotidylethanolamine exposed to this toxin display discrete current flow events typical of transmembrane channels and consistent with the interpretation that this toxin acts by forming pores in phospholipid membranes. The linear relationship of current amplitude to holding potential when examined over the -60 to +60 mV range indicates that this pore has a constant mean single channel conductance level of 350-400 pS.
AB - A proteinaceous hemolysin secreted by strain 4074 of serotype 1 of Actinobacillus pleuropneumoniae was purified by diafiltration and ion exchange chromatographic techniques. The hemolytic activity is associated with a 107-kDa band as assessed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis and confirmed by Western blotting and immunoprecipitation. This hemolysin produces pores in membranes as demonstrated by osmotic protection studies using red blood cells and carbohydrate compounds of various molecular weights. These assays suggest a pore diameter in the order of 2 nm. Phospholipid bilayers composed of 1:1 w/w phosphotidylserine:phosphotidylethanolamine exposed to this toxin display discrete current flow events typical of transmembrane channels and consistent with the interpretation that this toxin acts by forming pores in phospholipid membranes. The linear relationship of current amplitude to holding potential when examined over the -60 to +60 mV range indicates that this pore has a constant mean single channel conductance level of 350-400 pS.
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UR - http://www.scopus.com/inward/citedby.url?scp=0024361541&partnerID=8YFLogxK
M3 - Article
VL - 264
SP - 13559
EP - 13564
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 23
ER -