Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.

<h4>Background</h4>Voltage-gated Ca(v)1.2 calcium channels play a crucial role in Ca(2+) signaling. The pore-forming alpha(1C) subunit is regulated by accessory Ca(v)beta subunits, cytoplasmic proteins of various size encoded by four different genes (Ca(v)beta(1)-beta(4)) and expressed i...

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Autores principales:	Evgeny Kobrinsky, Parwiz Abrahimi, Son Q Duong, Sam Thomas, Jo Beth Harry, Chirag Patel, Qi Zong Lao, Nikolai M Soldatov
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2009
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/af37bee87c8a49f082369d457b40d7a9
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spelling	oai:doaj.org-article:af37bee87c8a49f082369d457b40d7a92021-12-02T20:12:11ZEffect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.1932-620310.1371/journal.pone.0005587https://doaj.org/article/af37bee87c8a49f082369d457b40d7a92009-05-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19492014/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Voltage-gated Ca(v)1.2 calcium channels play a crucial role in Ca(2+) signaling. The pore-forming alpha(1C) subunit is regulated by accessory Ca(v)beta subunits, cytoplasmic proteins of various size encoded by four different genes (Ca(v)beta(1)-beta(4)) and expressed in a tissue-specific manner.<h4>Methods and results</h4>Here we investigated the effect of three major Ca(v)beta types, beta(1b), beta(2d) and beta(3), on the structure of Ca(v)1.2 in the plasma membrane of live cells. Total internal reflection fluorescence microscopy showed that the tendency of Ca(v)1.2 to form clusters depends on the type of the Ca(v)beta subunit present. The highest density of Ca(v)1.2 clusters in the plasma membrane and the smallest cluster size were observed with neuronal/cardiac beta(1b) present. Ca(v)1.2 channels containing beta(3), the predominant Ca(v)beta subunit of vascular smooth muscle cells, were organized in a significantly smaller number of larger clusters. The inter- and intramolecular distances between alpha(1C) and Ca(v)beta in the plasma membrane of live cells were measured by three-color FRET microscopy. The results confirm that the proximity of Ca(v)1.2 channels in the plasma membrane depends on the Ca(v)beta type. The presence of different Ca(v)beta subunits does not result in significant differences in the intramolecular distance between the termini of alpha(1C), but significantly affects the distance between the termini of neighbor alpha(1C) subunits, which varies from 67 A with beta(1b) to 79 A with beta(3).<h4>Conclusions</h4>Thus, our results show that the structural organization of Ca(v)1.2 channels in the plasma membrane depends on the type of Ca(v)beta subunits present.Evgeny KobrinskyParwiz AbrahimiSon Q DuongSam ThomasJo Beth HarryChirag PatelQi Zong LaoNikolai M SoldatovPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 4, Iss 5, p e5587 (2009)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Evgeny Kobrinsky Parwiz Abrahimi Son Q Duong Sam Thomas Jo Beth Harry Chirag Patel Qi Zong Lao Nikolai M Soldatov Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.
description	<h4>Background</h4>Voltage-gated Ca(v)1.2 calcium channels play a crucial role in Ca(2+) signaling. The pore-forming alpha(1C) subunit is regulated by accessory Ca(v)beta subunits, cytoplasmic proteins of various size encoded by four different genes (Ca(v)beta(1)-beta(4)) and expressed in a tissue-specific manner.<h4>Methods and results</h4>Here we investigated the effect of three major Ca(v)beta types, beta(1b), beta(2d) and beta(3), on the structure of Ca(v)1.2 in the plasma membrane of live cells. Total internal reflection fluorescence microscopy showed that the tendency of Ca(v)1.2 to form clusters depends on the type of the Ca(v)beta subunit present. The highest density of Ca(v)1.2 clusters in the plasma membrane and the smallest cluster size were observed with neuronal/cardiac beta(1b) present. Ca(v)1.2 channels containing beta(3), the predominant Ca(v)beta subunit of vascular smooth muscle cells, were organized in a significantly smaller number of larger clusters. The inter- and intramolecular distances between alpha(1C) and Ca(v)beta in the plasma membrane of live cells were measured by three-color FRET microscopy. The results confirm that the proximity of Ca(v)1.2 channels in the plasma membrane depends on the Ca(v)beta type. The presence of different Ca(v)beta subunits does not result in significant differences in the intramolecular distance between the termini of alpha(1C), but significantly affects the distance between the termini of neighbor alpha(1C) subunits, which varies from 67 A with beta(1b) to 79 A with beta(3).<h4>Conclusions</h4>Thus, our results show that the structural organization of Ca(v)1.2 channels in the plasma membrane depends on the type of Ca(v)beta subunits present.
format	article
author	Evgeny Kobrinsky Parwiz Abrahimi Son Q Duong Sam Thomas Jo Beth Harry Chirag Patel Qi Zong Lao Nikolai M Soldatov
author_facet	Evgeny Kobrinsky Parwiz Abrahimi Son Q Duong Sam Thomas Jo Beth Harry Chirag Patel Qi Zong Lao Nikolai M Soldatov
author_sort	Evgeny Kobrinsky
title	Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.
title_short	Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.
title_full	Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.
title_fullStr	Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.
title_full_unstemmed	Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.
title_sort	effect of ca(v)beta subunits on structural organization of ca(v)1.2 calcium channels.
publisher	Public Library of Science (PLoS)
publishDate	2009
url	https://doaj.org/article/af37bee87c8a49f082369d457b40d7a9
work_keys_str_mv	AT evgenykobrinsky effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels AT parwizabrahimi effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels AT sonqduong effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels AT samthomas effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels AT jobethharry effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels AT chiragpatel effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels AT qizonglao effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels AT nikolaimsoldatov effectofcavbetasubunitsonstructuralorganizationofcav12calciumchannels
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Effect of Ca(v)beta subunits on structural organization of Ca(v)1.2 calcium channels.

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