Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies
The cystic fibrosis transmembrane conductance regulator protein (CFTR) is a chloride channel highly expressed in the gills of Salmo salar, with a role in osmoregulation. It shares 60% identity with the human CFTR channel, mutations to which can cause the common genetic disorder cystic fibrosis CF. T...
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ftdoajarticles:oai:doaj.org/article:44ae11f3c8c040fdae28099ca76a2f94 2023-05-15T18:09:57+02:00 Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies Naomi L. Pollock Oscar Moran Debora Baroni Olga Zegarra-Moran Robert C. Ford 2014-11-01T00:00:00Z https://doi.org/10.3934/molsci.2014.4.141 https://doaj.org/article/44ae11f3c8c040fdae28099ca76a2f94 EN eng AIMS Press http://www.aimspress.com/article/10.3934/molsci.2014.4.141/fulltext.html https://doaj.org/toc/2372-028X https://doaj.org/toc/2372-0301 doi:10.3934/molsci.2014.4.141 2372-028X 2372-0301 https://doaj.org/article/44ae11f3c8c040fdae28099ca76a2f94 AIMS Molecular Science, Vol 1, Iss 4, Pp 141-161 (2014) CFTR CFTR purification salmon osmoregulation Saccharomyces cerevisiae heterologous overexpression membrane protein purification cryo-electron microscopy small-angle X-ray scattering (SAXS) Biology (General) QH301-705.5 article 2014 ftdoajarticles https://doi.org/10.3934/molsci.2014.4.141 2022-12-30T23:48:00Z The cystic fibrosis transmembrane conductance regulator protein (CFTR) is a chloride channel highly expressed in the gills of Salmo salar, with a role in osmoregulation. It shares 60% identity with the human CFTR channel, mutations to which can cause the common genetic disorder cystic fibrosis CF. The expression and localisation of salmon CFTR have been investigated, but the isolated protein has not been extensively characterised. Here we present a protocol for the purification of recombinant salmon CFTR, along with biophysical and structural characterisation of the purified protein. Salmon CFTR was overexpressed in Saccharomyces cerevisiae, solubilised in the detergent LPG-14 and chromatographically purified by nickel-affinity and size-exclusion chromatography methods. Prior to size-exclusion chromatography samples of salmon CFTR had low purity, and contained large quantities of aggregated protein. Compared to size-exclusion chromatography profiles of other orthologues of CFTR, which had less evidence of aggregation, salmon CFTR appeared to have lower intrinsic stability than human and platypus CFTR. Nonetheless, repeated size-exclusion chromatography allowed monodisperse salmon CFTR to be isolated, and multi-angle light scattering was used to determine its oligomeric state. The monodispersity of the sample and its oligomeric state were confirmed using cryo-electron microscopy and small-angle X-ray scattering (SAXS). These data were also processed to calculate a low-resolution structure of the salmon CFTR, which showed similar architecture to other ATP-binding cassette proteins. Article in Journal/Newspaper Salmo salar Directory of Open Access Journals: DOAJ Articles AIMS Molecular Science 1 4 141 161 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
CFTR CFTR purification salmon osmoregulation Saccharomyces cerevisiae heterologous overexpression membrane protein purification cryo-electron microscopy small-angle X-ray scattering (SAXS) Biology (General) QH301-705.5 |
spellingShingle |
CFTR CFTR purification salmon osmoregulation Saccharomyces cerevisiae heterologous overexpression membrane protein purification cryo-electron microscopy small-angle X-ray scattering (SAXS) Biology (General) QH301-705.5 Naomi L. Pollock Oscar Moran Debora Baroni Olga Zegarra-Moran Robert C. Ford Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies |
topic_facet |
CFTR CFTR purification salmon osmoregulation Saccharomyces cerevisiae heterologous overexpression membrane protein purification cryo-electron microscopy small-angle X-ray scattering (SAXS) Biology (General) QH301-705.5 |
description |
The cystic fibrosis transmembrane conductance regulator protein (CFTR) is a chloride channel highly expressed in the gills of Salmo salar, with a role in osmoregulation. It shares 60% identity with the human CFTR channel, mutations to which can cause the common genetic disorder cystic fibrosis CF. The expression and localisation of salmon CFTR have been investigated, but the isolated protein has not been extensively characterised. Here we present a protocol for the purification of recombinant salmon CFTR, along with biophysical and structural characterisation of the purified protein. Salmon CFTR was overexpressed in Saccharomyces cerevisiae, solubilised in the detergent LPG-14 and chromatographically purified by nickel-affinity and size-exclusion chromatography methods. Prior to size-exclusion chromatography samples of salmon CFTR had low purity, and contained large quantities of aggregated protein. Compared to size-exclusion chromatography profiles of other orthologues of CFTR, which had less evidence of aggregation, salmon CFTR appeared to have lower intrinsic stability than human and platypus CFTR. Nonetheless, repeated size-exclusion chromatography allowed monodisperse salmon CFTR to be isolated, and multi-angle light scattering was used to determine its oligomeric state. The monodispersity of the sample and its oligomeric state were confirmed using cryo-electron microscopy and small-angle X-ray scattering (SAXS). These data were also processed to calculate a low-resolution structure of the salmon CFTR, which showed similar architecture to other ATP-binding cassette proteins. |
format |
Article in Journal/Newspaper |
author |
Naomi L. Pollock Oscar Moran Debora Baroni Olga Zegarra-Moran Robert C. Ford |
author_facet |
Naomi L. Pollock Oscar Moran Debora Baroni Olga Zegarra-Moran Robert C. Ford |
author_sort |
Naomi L. Pollock |
title |
Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies |
title_short |
Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies |
title_full |
Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies |
title_fullStr |
Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies |
title_full_unstemmed |
Characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies |
title_sort |
characterisation of the salmon cystic fibrosis transmembrane conductance regulator protein for structural studies |
publisher |
AIMS Press |
publishDate |
2014 |
url |
https://doi.org/10.3934/molsci.2014.4.141 https://doaj.org/article/44ae11f3c8c040fdae28099ca76a2f94 |
genre |
Salmo salar |
genre_facet |
Salmo salar |
op_source |
AIMS Molecular Science, Vol 1, Iss 4, Pp 141-161 (2014) |
op_relation |
http://www.aimspress.com/article/10.3934/molsci.2014.4.141/fulltext.html https://doaj.org/toc/2372-028X https://doaj.org/toc/2372-0301 doi:10.3934/molsci.2014.4.141 2372-028X 2372-0301 https://doaj.org/article/44ae11f3c8c040fdae28099ca76a2f94 |
op_doi |
https://doi.org/10.3934/molsci.2014.4.141 |
container_title |
AIMS Molecular Science |
container_volume |
1 |
container_issue |
4 |
container_start_page |
141 |
op_container_end_page |
161 |
_version_ |
1766182653100294144 |