Linked Life Data

8626486

Source:http://linkedlifedata.com/resource/pubmed/id/8626486

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
1996-6-21
pubmed:abstractText
Sodium channels posses receptor sites for many neurotoxins, of which several groups were shown to inhibit sodium current inactivation. Receptor sites that bind alpha- and alpha-like scorpion toxins are of particular interest since neurotoxin binding at these extracellular regions can affect the inactivation process at intramembranal segments of the channel. We examined, for the first time, the interaction of different scorpion neurotoxins, all affecting sodium current inactivation and toxic to mammals, with alpha-scorpion toxin receptor sites on both mammalian and insect sodium channels. As specific probes for rat and insect sodium channels, we used the radiolabeled alpha-scorpion toxins AaH II and LqhalphaIT, the most active alpha-toxins on mammals and insect, respectively. We demonstrate that the different scorpion toxins may be classified to several groups, according to their in vivo and in vitro activity on mammalian and insect sodium channels. Analysis of competitive binding interaction reveal that each group may occupy a distinct receptor site on sodium channels. The alpha-mammal scorpion toxins and the anti-insect Lqh alphaIT bind to homologous but not identical receptor sites on both rat brain and insect sodium channels. Sea anemone toxin ATX II, previously considered to share receptor site 3 with alpha-scorpion toxins, is suggested to bind to a partially overlapping receptor site with both AaH II and Lqh alphaIT. Competitive binding interactions with other scorpion toxins suggest the presence of a putative additional receptor site on sodium channels, which may bind a unique group of these scorpion toxins (Bom III and IV), active on both mammals and insects. We suggest the presence of a cluster of receptor sites for scorpion toxins that inhibit sodium current inactivation, which is very similar on insect and rat brain sodium channels, in spite of the structural and pharmacological differences between them. The sea anemone toxin ATX II is also suggested to bind within this cluster.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
271
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
8034-45
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:8626486-Amino Acid Sequence, pubmed-meshheading:8626486-Animals, pubmed-meshheading:8626486-Cockroaches, pubmed-meshheading:8626486-Grasshoppers, pubmed-meshheading:8626486-Ion Channel Gating, pubmed-meshheading:8626486-Marine Toxins, pubmed-meshheading:8626486-Mice, pubmed-meshheading:8626486-Molecular Sequence Data, pubmed-meshheading:8626486-Neurons, pubmed-meshheading:8626486-Neurotoxins, pubmed-meshheading:8626486-Oxocins, pubmed-meshheading:8626486-Rats, pubmed-meshheading:8626486-Rats, Wistar, pubmed-meshheading:8626486-Scorpion Venoms, pubmed-meshheading:8626486-Sequence Alignment, pubmed-meshheading:8626486-Sequence Homology, Amino Acid, pubmed-meshheading:8626486-Sodium Channels, pubmed-meshheading:8626486-Species Specificity, pubmed-meshheading:8626486-Synaptosomes, pubmed-meshheading:8626486-Veratridine
pubmed:year
1996
pubmed:articleTitle
Scorpion toxins affecting sodium current inactivation bind to distinct homologous receptor sites on rat brain and insect sodium channels.
pubmed:affiliation
Laboratory of Biochemistry, CNRS URA 1455, INSERM U 374, Faculty of Medicine Nord, Jean Roche Institute, Bd. Pierre Dramard, 13916 Marseille Cedex 20, France.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't