TY - JOUR
T1 - Evidence that α-dihydrograyanotoxin II does not bind to the sodium gate
AU - Soeda, Yoshinori
AU - O'Brien, R. D.
AU - Yeh, J. Z.
AU - Narahashi, Toshio
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1975/12
Y1 - 1975/12
N2 - The basis for the ability of α-dihydrograyanotoxin II (α-2HG-II) to promote Na+ conductance in axons was sought. The apparent binding of tritiated α-2HG-II to neural and other preparations was studied, using equilibrium dialysis, with lobster axon membranes, Torpedo electroplax, housefly head, and rat brain, liver and kidney. In every case the "binding" was nonsaturating and was suggested to involve nonspecific partitioning into the tissue. Supporting evidence was the similarity of extent of "binding" in all tissues and its relative insensitivity to neuropharmacological agents. α-2HG-II did not affect the Na+ conductance of phospholipid bilayers, nor did it permit transport of22Na into a bulk organic phase. It was concluded that α-2HG-II did not bind to the sodium gate, but possibly to a sodium permease present at a frequency of less than one per μ2 of cell membrane.
AB - The basis for the ability of α-dihydrograyanotoxin II (α-2HG-II) to promote Na+ conductance in axons was sought. The apparent binding of tritiated α-2HG-II to neural and other preparations was studied, using equilibrium dialysis, with lobster axon membranes, Torpedo electroplax, housefly head, and rat brain, liver and kidney. In every case the "binding" was nonsaturating and was suggested to involve nonspecific partitioning into the tissue. Supporting evidence was the similarity of extent of "binding" in all tissues and its relative insensitivity to neuropharmacological agents. α-2HG-II did not affect the Na+ conductance of phospholipid bilayers, nor did it permit transport of22Na into a bulk organic phase. It was concluded that α-2HG-II did not bind to the sodium gate, but possibly to a sodium permease present at a frequency of less than one per μ2 of cell membrane.
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U2 - 10.1007/BF01870246
DO - 10.1007/BF01870246
M3 - Article
C2 - 1165582
AN - SCOPUS:0016806896
SN - 0022-2631
VL - 23
SP - 91
EP - 101
JO - The Journal of Membrane Biology
JF - The Journal of Membrane Biology
IS - 1
ER -