Intracellular domains of the delta-subunits of Torpedo and rat acetylcholine receptors--expression, purification, and characterization
(2004) In Protein Expression and Purification 2(38). p.237-247- Abstract
- There are quite detailed structural data on the extracellular ligand-binding domain and the intramembrane channel-forming domain of the nicotinic acetylcholine receptors (nAChR). However, the structure of the intracellular domain, which has variable amino acid sequences in different nAChR subunits, remains unknown. We expressed in Escherichia coli the intracellular loops (between transmembrane fragments TM3 and TM4) of the δ-subunits from the Torpedo californica and Rattus norvegicus muscle nAChRs. To facilitate purification, (His)6-tags were attached with or without linkers, and the effects of protein truncations at C- or N-termini were examined. The proteins were purified from inclusion bodies under denaturing conditions by... (More)
- There are quite detailed structural data on the extracellular ligand-binding domain and the intramembrane channel-forming domain of the nicotinic acetylcholine receptors (nAChR). However, the structure of the intracellular domain, which has variable amino acid sequences in different nAChR subunits, remains unknown. We expressed in Escherichia coli the intracellular loops (between transmembrane fragments TM3 and TM4) of the δ-subunits from the Torpedo californica and Rattus norvegicus muscle nAChRs. To facilitate purification, (His)6-tags were attached with or without linkers, and the effects of protein truncations at C- or N-termini were examined. The proteins were purified from inclusion bodies under denaturing conditions by Ni–NTA-chromatography. Molecular weight and peptide mass fingerprint was determined by MALDI mass spectrometry. Size-exclusion chromatography revealed that the Torpedo intracellular δ-loop refolded in an aqueous buffer was present in solution as a dimer. Phosphorylation of this protein with protein kinase A and tyrosine kinase (Abl) occurred at the same serine and tyrosine residues as in the native receptor. According to CD spectra, the secondary structure was not sensitive to phosphorylation. The rat intracellular loops could be solubilized only in the presence of non-ionic detergents or lipids. CD spectra indicate that the Torpedo and rat proteins have differences in their secondary structure. In the presence of dodecylphosphocholine, high concentrations (up to 6 mg/ml) of the Torpedo and rat intracellular loops were achieved. The results suggest that the spatial structure of the intracellular loops is dependent on environment and species, but is not changed significantly upon enzymatic phosphorylation. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1131085
- author
- Kottwitz, Denise LU ; Kukhtina, Viktoria ; Dergousova, Natalia ; Alexeev, Timophey ; Utkin, Yuri ; Tsetlin, Victor and Hucho, Ferdinand
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Protein Expression and Purification
- volume
- 2
- issue
- 38
- pages
- 237 - 247
- publisher
- Academic Press
- external identifiers
-
- scopus:8844242589
- pmid:15555939
- ISSN
- 1046-5928
- DOI
- 10.1016/j.pep.2004.07.017
- language
- English
- LU publication?
- yes
- id
- c37821a9-5541-4bb9-a1f5-ca21c7a6832e (old id 1131085)
- date added to LUP
- 2016-04-01 12:23:56
- date last changed
- 2022-08-21 06:38:17
@article{c37821a9-5541-4bb9-a1f5-ca21c7a6832e,
abstract = {{There are quite detailed structural data on the extracellular ligand-binding domain and the intramembrane channel-forming domain of the nicotinic acetylcholine receptors (nAChR). However, the structure of the intracellular domain, which has variable amino acid sequences in different nAChR subunits, remains unknown. We expressed in Escherichia coli the intracellular loops (between transmembrane fragments TM3 and TM4) of the δ-subunits from the Torpedo californica and Rattus norvegicus muscle nAChRs. To facilitate purification, (His)6-tags were attached with or without linkers, and the effects of protein truncations at C- or N-termini were examined. The proteins were purified from inclusion bodies under denaturing conditions by Ni–NTA-chromatography. Molecular weight and peptide mass fingerprint was determined by MALDI mass spectrometry. Size-exclusion chromatography revealed that the Torpedo intracellular δ-loop refolded in an aqueous buffer was present in solution as a dimer. Phosphorylation of this protein with protein kinase A and tyrosine kinase (Abl) occurred at the same serine and tyrosine residues as in the native receptor. According to CD spectra, the secondary structure was not sensitive to phosphorylation. The rat intracellular loops could be solubilized only in the presence of non-ionic detergents or lipids. CD spectra indicate that the Torpedo and rat proteins have differences in their secondary structure. In the presence of dodecylphosphocholine, high concentrations (up to 6 mg/ml) of the Torpedo and rat intracellular loops were achieved. The results suggest that the spatial structure of the intracellular loops is dependent on environment and species, but is not changed significantly upon enzymatic phosphorylation.}},
author = {{Kottwitz, Denise and Kukhtina, Viktoria and Dergousova, Natalia and Alexeev, Timophey and Utkin, Yuri and Tsetlin, Victor and Hucho, Ferdinand}},
issn = {{1046-5928}},
language = {{eng}},
number = {{38}},
pages = {{237--247}},
publisher = {{Academic Press}},
series = {{Protein Expression and Purification}},
title = {{Intracellular domains of the delta-subunits of Torpedo and rat acetylcholine receptors--expression, purification, and characterization}},
url = {{http://dx.doi.org/10.1016/j.pep.2004.07.017}},
doi = {{10.1016/j.pep.2004.07.017}},
volume = {{2}},
year = {{2004}},
}