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Structure—Function Studies of the Eighth Hydrophobic Domain of a Serotonin Receptor

Structure—Function Studies of the Eighth Hydrophobic Domain of a Serotonin Receptor Abstract : The most prominent structural feature of the G protein‐coupled receptor superfamily is their seven hydrophobic domains, which are postulated to form membrane‐spanning α helices. Some members of the G protein‐coupled receptor family, specifically several serotonin (5‐HT) receptors, possess eight hydrophobic domains. The importance of this extra hydrophobic domain, located at the N terminus of the receptor, is unknown. This question was addressed by deleting the extra hydrophobic region from the 5‐HT2C receptor and comparing its function and topology with those of the wild‐type receptor. Immunofluorescence microscopy was used to determine the location of the N terminus of the epitope‐tagged wild‐type and mutant receptors. The N terminus of both receptors was extracellular, suggesting that the extra hydrophobic domain does not change the topology of this receptor and is unlikely to be a membrane‐spanning α helix. Radioligand‐binding studies in transfected cells and expression studies in Xenopus oocytes demonstrated that seven hydrophobic domains were sufficient for normal function in these assays. Interestingly, the mutant receptor, now containing seven hydrophobic domains, is expressed at higher levels in transfected cells than the wild‐type receptor containing eight hydrophobic domains, suggesting that the extra hydrophobic domain does impact the activity of this receptor by regulating its expression. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurochemistry Wiley

Structure—Function Studies of the Eighth Hydrophobic Domain of a Serotonin Receptor

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References (55)

Publisher
Wiley
Copyright
© International Society for Neurochemistry
ISSN
0022-3042
eISSN
1471-4159
DOI
10.1046/j.1471-4159.1999.0720413.x
Publisher site
See Article on Publisher Site

Abstract

Abstract : The most prominent structural feature of the G protein‐coupled receptor superfamily is their seven hydrophobic domains, which are postulated to form membrane‐spanning α helices. Some members of the G protein‐coupled receptor family, specifically several serotonin (5‐HT) receptors, possess eight hydrophobic domains. The importance of this extra hydrophobic domain, located at the N terminus of the receptor, is unknown. This question was addressed by deleting the extra hydrophobic region from the 5‐HT2C receptor and comparing its function and topology with those of the wild‐type receptor. Immunofluorescence microscopy was used to determine the location of the N terminus of the epitope‐tagged wild‐type and mutant receptors. The N terminus of both receptors was extracellular, suggesting that the extra hydrophobic domain does not change the topology of this receptor and is unlikely to be a membrane‐spanning α helix. Radioligand‐binding studies in transfected cells and expression studies in Xenopus oocytes demonstrated that seven hydrophobic domains were sufficient for normal function in these assays. Interestingly, the mutant receptor, now containing seven hydrophobic domains, is expressed at higher levels in transfected cells than the wild‐type receptor containing eight hydrophobic domains, suggesting that the extra hydrophobic domain does impact the activity of this receptor by regulating its expression.

Journal

Journal of Neurochemistry – Wiley

Published: Jan 1, 1999

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