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pubmed-article:16554404pubmed:abstractTextK+ channels are widely expressed in eukaryotic and prokaryotic cells, where one of their key functions is to set the membrane potential. Many K+ channels are tetramers that share common architectural properties. The crystal structure of bacterial and mammalian K+ channels has been resolved and provides the basis for modeling their three-dimensional structure in different functional states. This wealth of information on K+ channel structure contrasts with the difficulties to visualize single K+ channel proteins in their physiological environment. We describe a method to identify single Ca2+-activated K+ channel molecules in the plasma membrane of migrating cells. Our method is based on dual-color labeling with quantum dots. We show that >90% of the observed quantum dots correspond to single K+ channel proteins. We anticipate that our method can be adopted to label any other ion channel in the plasma membrane on the single molecule level.lld:pubmed
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pubmed-article:16554404pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:16554404pubmed:year2006lld:pubmed
pubmed-article:16554404pubmed:articleTitleSingle plasma membrane K+ channel detection by using dual-color quantum dot labeling.lld:pubmed
pubmed-article:16554404pubmed:affiliationInstitute of Physiology II, Univ. of Münster, Robert-Koch-Strasse 27b, D-48149 Münster, Germany.lld:pubmed
pubmed-article:16554404pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16554404pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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