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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
5180
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pubmed:dateCreated |
1994-10-19
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pubmed:abstractText |
The functional consequences of single proton transfers occurring in the pore of a cyclic nucleotide-gated channel were observed with patch recording techniques. These results led to three conclusions about the chemical nature of ion binding sites in the conduction pathway: The channel contains two identical titratable sites, even though there are more than two (probably four) identical subunits; the sites are formed by glutamate residues that have a pKa (where K(a) is the acid constant) of 7.6; and protonation of one site does not perturb the pKa of the other. These properties point to an unusual arrangement of carboxyl side-chain residues in the pore of a cation channel.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:month |
Sep
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pubmed:issn |
0036-8075
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
23
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pubmed:volume |
265
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
1852-6
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pubmed:dateRevised |
2007-11-14
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pubmed:meshHeading |
pubmed-meshheading:7522344-Amino Acid Sequence,
pubmed-meshheading:7522344-Animals,
pubmed-meshheading:7522344-Binding Sites,
pubmed-meshheading:7522344-Calcium Channels,
pubmed-meshheading:7522344-Catfishes,
pubmed-meshheading:7522344-Electric Conductivity,
pubmed-meshheading:7522344-Hydrogen-Ion Concentration,
pubmed-meshheading:7522344-Ion Channel Gating,
pubmed-meshheading:7522344-Ion Channels,
pubmed-meshheading:7522344-Kinetics,
pubmed-meshheading:7522344-Molecular Sequence Data,
pubmed-meshheading:7522344-Mutation,
pubmed-meshheading:7522344-Protons,
pubmed-meshheading:7522344-Sodium,
pubmed-meshheading:7522344-Xenopus
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pubmed:year |
1994
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pubmed:articleTitle |
Two identical noninteracting sites in an ion channel revealed by proton transfer.
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pubmed:affiliation |
Department of Neurobiology, Harvard Medical School, Boston, MA 02115.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.
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