Linked Life Data

12379267

Source:http://linkedlifedata.com/resource/pubmed/id/12379267

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pubmed-article:12379267pubmed:dateCreated2002-10-15lld:pubmed
pubmed-article:12379267pubmed:abstractTextElectrogenic cotransporters are membrane proteins that use the electrochemical gradient across the cell membrane of a cosubstrate ion, for example Na(+) or H(+), to mediate uphill cotransport of a substrate specific to the transport protein. The cotransport process involves recognition of both cosubstrate and substrate and translocation of each species according to a defined stoichiometry. Electrogenicity implies net movement of charges across the membrane in response to the transmembrane voltage and therefore, in addition to isotope flux assays, the cotransport kinetics can be studied in real-time using electrophysiological methods. As well as the cotransport mode, many cotransporters also display a uniport or slippage mode, whereby the cosubstrate ions translocate in the absence of substrate. The current challenge is to define structure-function relationships by identifying functionally important elements in the protein that confer the transport properties and thus contribute to the ultimate goal of having a 3-D model of the protein that conveys both structural and functional information. In this review we focus on a functional approach to meet this challenge, based on a combination of real-time electrophysiological assays, together with molecular biological and biochemical methods. This is illustrated, by way of example, using data obtained by heterologous expression of the renal Na(+)-coupled inorganic phosphate cotransporter (NaP(i)-IIa) for which structure-function relationships are beginning to emerge.lld:pubmed
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pubmed-article:12379267pubmed:authorpubmed-author:KöhlerKatjaKlld:pubmed
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pubmed-article:12379267pubmed:copyrightInfoCopyright 2002 Elsevier Science Ltd.lld:pubmed
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pubmed-article:12379267pubmed:volume80lld:pubmed
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pubmed-article:12379267pubmed:pagination69-108lld:pubmed
pubmed-article:12379267pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:12379267pubmed:articleTitleForging the link between structure and function of electrogenic cotransporters: the renal type IIa Na+/Pi cotransporter as a case study.lld:pubmed
pubmed-article:12379267pubmed:affiliationPhysiologisches Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland. iforster@access.unizh.chlld:pubmed
pubmed-article:12379267pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12379267pubmed:publicationTypeReviewlld:pubmed
pubmed-article:12379267pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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