{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T06:49:16Z","timestamp":1791355756131,"version":"4.3.1"},"reference-count":46,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2012,7,3]],"date-time":"2012-07-03T00:00:00Z","timestamp":1341273600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Plant Journal"],"published-print":{"date-parts":[[2012,9]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>The plant hormone auxin is a mobile signal which affects nuclear transcription by regulating the stability of auxin\/indole\u20103\u2010acetic acid (IAA) repressor proteins. Auxin is transported polarly from cell to cell by auxin efflux proteins of the PIN family, but it is not as yet clear how auxin levels are regulated within cells and how access of auxin to the nucleus may be controlled. The Arabidopsis genome contains eight <jats:italic>PIN<\/jats:italic>s, encoding proteins with a similar membrane topology. While five of the PINs are typically targeted polarly to the plasma membranes, the smallest members of the family, PIN5 and PIN8, seem to be located not at the plasma membrane but in endomembranes. Here we demonstrate by electron microscopy analysis that PIN8, which is specifically expressed in pollen, resides in the endoplasmic reticulum and that it remains internally localized during pollen tube growth. Transgenic Arabidopsis and tobacco plants were generated overexpressing or ectopically expressing functional PIN8, and its role in control of auxin homeostasis was studied. PIN8 ectopic expression resulted in strong auxin\u2010related phenotypes. The severity of phenotypes depended on PIN8 protein levels, suggesting a rate\u2010limiting activity for PIN8. The observed phenotypes correlated with elevated levels of free IAA and ester\u2010conjugated IAA. Activation of the auxin\u2010regulated synthetic DR5 promoter and of auxin response genes was strongly repressed in seedlings overexpressing PIN8 when exposed to 1\u2010naphthalene acetic acid. Thus, our data show a functional role for endoplasmic reticulum\u2010localized PIN8 and suggest a mechanism whereby PIN8 controls auxin thresholds and access of auxin to the nucleus, thereby regulating auxin\u2010dependent transcriptional activity.<\/jats:p>","DOI":"10.1111\/j.1365-313x.2012.05037.x","type":"journal-article","created":{"date-parts":[[2012,4,28]],"date-time":"2012-04-28T15:10:32Z","timestamp":1335625832000},"page":"860-870","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":144,"title":["The endoplasmic reticulum localized PIN8 is a pollen\u2010specific auxin carrier involved in intracellular auxin homeostasis"],"prefix":"10.1111","volume":"71","author":[{"given":"Cristina Dal","family":"Bosco","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander","family":"Dovzhenko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nina","family":"Woerner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tatiana","family":"Rensch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margitta","family":"Eismann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Eimer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan","family":"Hegermann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivan A.","family":"Paponov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benedetto","family":"Ruperti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erwin","family":"Heberle\u2010Bors","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alisher","family":"Touraev","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jerry D.","family":"Cohen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Klaus","family":"Palme","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,7,3]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncb1369"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00425-005-0088-9"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/nprot.2010.118"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.arplant.58.032806.103805"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1104\/pp.100.4.2002"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature03184"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1105\/tpc.107.057570"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1101\/gad.1415106"},{"key":"e_1_2_6_10_1","first-page":"143","article-title":"Nicotiana (Nicotiana tobaccum, Nicotiana benthamiana)","volume":"343","author":"Clemente T.","year":"2006","journal-title":"Methods Mol. 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