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R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain

In vertebrate photoreceptor cells, rapid recovery from light excitation is dependent on the RGS9⋅Gβ5 GTPase-activating complex located in the light-sensitive outer segment organelle. RGS9⋅Gβ5 is tethered to the outer segment membranes by its membrane anchor, R9AP. Recent studies indicated that RGS9⋅...

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Autores principales: Pearring, Jillian N., Lieu, Eric C., Winter, Joan R., Baker, Sheila A., Arshavsky, Vadim Y.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4148253/
https://www.ncbi.nlm.nih.gov/pubmed/25009288
http://dx.doi.org/10.1091/mbc.E14-02-0747
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author Pearring, Jillian N.
Lieu, Eric C.
Winter, Joan R.
Baker, Sheila A.
Arshavsky, Vadim Y.
author_facet Pearring, Jillian N.
Lieu, Eric C.
Winter, Joan R.
Baker, Sheila A.
Arshavsky, Vadim Y.
author_sort Pearring, Jillian N.
collection PubMed
description In vertebrate photoreceptor cells, rapid recovery from light excitation is dependent on the RGS9⋅Gβ5 GTPase-activating complex located in the light-sensitive outer segment organelle. RGS9⋅Gβ5 is tethered to the outer segment membranes by its membrane anchor, R9AP. Recent studies indicated that RGS9⋅Gβ5 possesses targeting information that excludes it from the outer segment and that this information is overridden by association with R9AP, which allows outer segment targeting of the entire complex. It was also proposed that R9AP itself does not contain specific targeting information and instead is delivered to the outer segment in the same post-Golgi vesicles as rhodopsin, because they are the most abundant transport vesicles in photoreceptor cells. In this study, we revisited this concept by analyzing R9AP targeting in rods of wild-type and rhodopsin-knockout mice. We found that the R9AP targeting mechanism does not require the presence of rhodopsin and further demonstrated that R9AP is actively targeted in rods by its SNARE homology domain.
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spelling pubmed-41482532014-11-16 R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain Pearring, Jillian N. Lieu, Eric C. Winter, Joan R. Baker, Sheila A. Arshavsky, Vadim Y. Mol Biol Cell Articles In vertebrate photoreceptor cells, rapid recovery from light excitation is dependent on the RGS9⋅Gβ5 GTPase-activating complex located in the light-sensitive outer segment organelle. RGS9⋅Gβ5 is tethered to the outer segment membranes by its membrane anchor, R9AP. Recent studies indicated that RGS9⋅Gβ5 possesses targeting information that excludes it from the outer segment and that this information is overridden by association with R9AP, which allows outer segment targeting of the entire complex. It was also proposed that R9AP itself does not contain specific targeting information and instead is delivered to the outer segment in the same post-Golgi vesicles as rhodopsin, because they are the most abundant transport vesicles in photoreceptor cells. In this study, we revisited this concept by analyzing R9AP targeting in rods of wild-type and rhodopsin-knockout mice. We found that the R9AP targeting mechanism does not require the presence of rhodopsin and further demonstrated that R9AP is actively targeted in rods by its SNARE homology domain. The American Society for Cell Biology 2014-09-01 /pmc/articles/PMC4148253/ /pubmed/25009288 http://dx.doi.org/10.1091/mbc.E14-02-0747 Text en © 2014 Pearring et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,” “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society of Cell Biology.
spellingShingle Articles
Pearring, Jillian N.
Lieu, Eric C.
Winter, Joan R.
Baker, Sheila A.
Arshavsky, Vadim Y.
R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain
title R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain
title_full R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain
title_fullStr R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain
title_full_unstemmed R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain
title_short R9AP targeting to rod outer segments is independent of rhodopsin and is guided by the SNARE homology domain
title_sort r9ap targeting to rod outer segments is independent of rhodopsin and is guided by the snare homology domain
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4148253/
https://www.ncbi.nlm.nih.gov/pubmed/25009288
http://dx.doi.org/10.1091/mbc.E14-02-0747
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