Switch to
| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
1
|
| pubmed:dateCreated |
1978-6-17
|
| pubmed:abstractText |
Characterization of acetylcholine-receptor-enriched membranes from Torpedo californica electric tissue by negative-staining electron-microscopy and by lipid analysis is described. The protein/lipid ratio is 70%/30%. The lipids consist of 70% phospholipids (46% phosphatidylcholine, 31% phosphatidylethanolamine, 14% phosphatidylserine, 7% sphingomyelin, 2% phosphatidylinositol of the phospholipids determined) and 20% cholesterol. The acetylcholinesterase-enriched membranes show a similar composition. The only differences are a lower protein/lipid ratio (45%/55%) and a lower phosphatidylcholine/sphingomyelin ratio of 39%/14% as compared to 46%/7% for the receptor-enriched membranes. A method of preparing single-walled phosphatidylcholine vesicles by gel filtration on Sephadex G50 according to Brunner et al. (Biochem. Biophys. Acta, 455, 322--331, 1976) is used to recombine the lipid-depleted receptor complex with artificial lipid vesicles. Starting from a lipid mixture of 46% phosphatidylcholine, 31% phosphatidylethanolamine, 14% phosphatidylserine, 7% sphingomyelin, 2% phosphatidylinositol and 15% cholesterol we obtained vesicles associated with the acetylcholine receptor complex. These receptor vesicles are chemically excitable by 10 micrometer carbamoylcholine as measured by efflux of 22Na+ from the vesicles. The excitability is blocked by preincubation with 0.5 mM alpha-toxin from Naja naja siamensis venom and by reduction with 5 mM dithioerythritol.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Apr
|
| pubmed:issn |
0014-2956
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
85
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
55-63
|
| pubmed:dateRevised |
2007-7-23
|
| pubmed:meshHeading |
pubmed-meshheading:639824-Acetylcholine,
pubmed-meshheading:639824-Animals,
pubmed-meshheading:639824-Cell Membrane,
pubmed-meshheading:639824-Electric Organ,
pubmed-meshheading:639824-Fishes,
pubmed-meshheading:639824-Membrane Lipids,
pubmed-meshheading:639824-Molecular Weight,
pubmed-meshheading:639824-Phospholipids,
pubmed-meshheading:639824-Receptors, Cholinergic
|
| pubmed:year |
1978
|
| pubmed:articleTitle |
Membranes rich in acetylcholine receptor: characterization and reconstitution to excitable membranes from exogenous lipids.
|
| pubmed:publicationType |
Journal Article
|