Linked Life Data

9075647

Source:http://linkedlifedata.com/resource/pubmed/id/9075647

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1997-5-12
pubmed:abstractText
Replacement of an amino acid residue at position 130 -Gly by Cys- in the primary structure of Staphylococcus aureus alpha-toxin decreases the single-channel conductance induced by the toxin in planar lipid bilayers. Concomitantly, the pH value at which the channel becomes unable to discriminate between Cl- and K+ ions is also decreased. By contrast, the pH dependence of the efficiency of the mutant toxin to form ion channels in lipid bilayers was unchanged (maximum efficiency at pH 5.5-6.0). The asymmetry and nonlinearity of the current-voltage characteristics of the channel were increased by the point mutation but the diameter of the water pore induced by the mutant toxin, evaluated in lipid bilayers and in erythrocyte membranes, was found to be indistinguishable from that formed by wild-type toxin and equal to 2.4-2.6 nm. Alterations at the "trans mouth" were found to be responsible for all observed changes of the channel properties. This mouth is situated close to the surface of the second leaflet of a bilayer lipid membrane. The data obtained allows us to propose that the region around residue 130 in fact determines the main features of the ST-channel and takes part in the formation of the trans entrance of the channel.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-2631
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
156
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
157-72
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Influence of Cys-130 S. aureus alpha-toxin on planar lipid bilayer and erythrocyte membranes.
pubmed:affiliation
Laboratory of Molecular Physiology, Institute of Physiology and Biophysics, 700095 Tashkent, Uzbekistan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't