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dc.contributor.authorTaylor, Colin
dc.contributor.authorRossi, Ana
dc.date.accessioned2018-12-22T00:30:51Z
dc.date.available2018-12-22T00:30:51Z
dc.date.issued2018-12-14
dc.identifier.issn1477-9137
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/287381
dc.description.abstractInositol 1,4,5-trisphosphate receptors (IP3Rs) are widely expressed intracellular channels that release Ca2+ from the endoplasmic reticulum (ER). We review how studies of IP3Rs removed from their intracellular environment (‘ex cellula’), alongside similar analyses of ryanodine receptors, have contributed to understanding IP3R behaviour. Analyses of permeabilized cells demonstrated that the ER is the major intracellular Ca2+ store, and that IP3 stimulates Ca2+ release from it. Radioligand binding confirmed that the 4,5-phosphates of IP3 are essential for activating IP3Rs, and facilitated IP3R purification and cloning, which paved the way to structural analyses. Reconstitution of IP3Rs into lipid bilayers and patch-clamp recording from the nuclear envelope established that IP3Rs have a large conductance and select weakly between Ca2+ and other cations. Structural analyses are now revealing how IP3 binding to the N-terminus of the tetrameric IP3R opens the pore 7nm away from the IP3-binding core (IBC). Communication between the IBC and pore passes through a nexus of interleaved domains contributed by structures associated with the pore and cytosolic domains, which together contribute to a Ca2+-binding site. These structural analyses provide a plausible explanation for the suggestion that IP3 gates IP3Rs by first stimulating Ca2+ binding, which leads to pore opening and Ca2+ release.
dc.publisherThe Company of Biologists Ltd.
dc.titleIP3 receptors – lessons from analyses ex cellula
dc.typeArticle
prism.numberjcs222463
prism.publicationNameJournal of Cell Science
prism.volume132
dc.identifier.doi10.17863/CAM.34685
dcterms.dateAccepted2018-11-08
rioxxterms.versionofrecord10.1242/jcs.222463
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-11-08
dc.contributor.orcidTaylor, Colin [0000-0001-7771-1044]
dc.identifier.eissn1477-9137
rioxxterms.typeJournal Article/Review
pubs.funder-project-idWellcome Trust (101844/Z/13/Z)
pubs.funder-project-idBiotechnology and Biological Sciences Research Council (BB/P005330/1)
cam.issuedOnline2018-12-14
rioxxterms.freetoread.startdate2019-12-14


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