Phosphagen in the Electrical Organ of Torpedo
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Phospholipid turnover in Torpedo marmorata electric organ during discharge in vivo.
One electric organ of anaesthetized Torpedo marmorata was stimulated through electrodes placed on the electric lobe of the brain. Nerves to the other electric organ were cut to provide an unstimulated control. Glucose 6-[32P]phosphate was injected into each organ 16h before electrical stimulation. After stimulation for 10 min at 5 Hz, the organs were removed homogenized and centrifuged on a den...
متن کاملcDNAs for the postsynaptic 43-kDa protein of Torpedo electric organ encode two proteins with different carboxyl termini.
Postsynaptic membranes isolated from Torpedo electric organ are highly enriched in the nicotinic acetylcholine receptor and a nonreceptor protein of 43 kDa; the distribution of the 43-kDa protein and the receptor is coextensive in the electrical membrane. As a first step in understanding the regulation of 43-kDa protein expression, we have isolated and characterized 43-kDa protein cDNAs. A lamb...
متن کاملRapid acetylcholine and adenosine triphosphate oscillations triggered by stimulation of the Torpedo electric organ.
1. When the electric organ of Torpedo is stimulated a large number of synchronized cholinergic synapses are activated. This permits the measurement of changes in the tissue level of ACh associated with the release process, usually recorded as an electric discharge. 2. At 5 Hz stimulation the output per impulse and the amount of cytoplasmic (free ACh) declines for about 30 s. The output then rem...
متن کاملIdentification of a 43-kDa polypeptide associated with acetylcholine receptor-enriched membranes as MM creatine kinase.
Creatine kinase isoenzymes from Torpedo californica electric organ, skeletal muscle, and brain were purified and characterized. Torpedo electric organ and skeletal muscle creatine kinase have identical apparent Mr, electrophoretic mobility, and cyanogen bromide fragments. The electrophoretic mobility of the Torpedo creatine kinase was anodal as compared to mammalian MM creatine kinase. No creat...
متن کاملAnaerobiosis and organ-specific regulation of glycolysis in a marine whelk
STOREY, K. B., KELLY, D. A., DUNCAN, J . A., and STOREY, J . M. 1990. Anaerobiosis and organ-specific regulation of glycolysis in a marine whelk. Can. J . Zool. 68: 974-980. Changes in the levels of glycolytic intermediates, adenylates, phosphagen, and substrates and products of anaerobic metabolism were monitored over the initial hours of anaerobiosis in radular retractor muscle, foot muscle, ...
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تاریخ انتشار 2005