Intracellular domains of the delta-subunits of Torpedo and rat acetylcholine receptors--expression, purification, and characterization

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Intracellular domains of the delta-subunits of Torpedo and rat acetylcholine receptors--expression, purification, and characterization. / Kottwitz, Denise; Kukhtina, Viktoria; Dergousova, Natalia; Alexeev, Timophey; Utkin, Yuri; Tsetlin, Victor; Hucho, Ferdinand.

In: Protein Expression and Purification, Vol. 2, No. 38, 2004, p. 237-247.

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Kottwitz, Denise ; Kukhtina, Viktoria ; Dergousova, Natalia ; Alexeev, Timophey ; Utkin, Yuri ; Tsetlin, Victor ; Hucho, Ferdinand. / Intracellular domains of the delta-subunits of Torpedo and rat acetylcholine receptors--expression, purification, and characterization. In: Protein Expression and Purification. 2004 ; Vol. 2, No. 38. pp. 237-247.

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TY - JOUR

T1 - Intracellular domains of the delta-subunits of Torpedo and rat acetylcholine receptors--expression, purification, and characterization

AU - Kottwitz, Denise

AU - Kukhtina, Viktoria

AU - Dergousova, Natalia

AU - Alexeev, Timophey

AU - Utkin, Yuri

AU - Tsetlin, Victor

AU - Hucho, Ferdinand

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

U2 - 10.1016/j.pep.2004.07.017

DO - 10.1016/j.pep.2004.07.017

M3 - Article

VL - 2

SP - 237

EP - 247

JO - Protein Expression and Purification

JF - Protein Expression and Purification

SN - 1046-5928

IS - 38

ER -