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Expression and biophysical analysis of a triple-transmembrane domain-containing fragment from a yeast G protein-coupled receptor


Caroccia, K E; Estephan, R; Cohen, L S; Arshava, B; Hauser, M; Zerbe, O; Becker, J M; Naider, F (2011). Expression and biophysical analysis of a triple-transmembrane domain-containing fragment from a yeast G protein-coupled receptor. Biopolymers Peptide Science, 96(6):757-771.

Abstract

Structural characterization of G protein-coupled receptors (GPCRs) is hindered by the inherent hydrophobicity, flexibility, and large size of these signaling proteins. Insights into conformational preferences and the three- dimensional (3D) structure of domains of these receptors can be obtained using polypeptide fragments of these proteins. Herein, we report the expression, purification, and biophysical characterization of a three- transmembrane domain-containing 131-residue fragment of the yeast a-factor receptor, Ste2p. Ste2p TM1–TM3 (G31–R161) was expressed as a TrpDLE fusion protein in Escherichia coli. The expressed protein was subject to CNBr cleavage to remove the fusion tag and TM1–TM3 was purified by reverse-phased HPLC. The cleavage product was isolated in yields of up to 20 mg per liter of culture in both unlabeled and uniformly [15N]-labeled and [15N, 13C, 2H]-labeled forms. The secondary structure of TM1–TM3 was determined to be helical in a number of membrane mimetic environments,including 2,2,2-trifluoroethanol (TFE):water and lysomyristoylphosphatidylglycerol (LMPG) detergent micelles by circular dichroism. Preliminary HSQC analysis in 50% TFE:water and LMPG micelles prepared in sodium phosphate and 4-(2-hydroxyethyl)-1- piperazine ethanesulfonic acid (HEPES) buffers revealed that this fragment is suitable for structural analysis by nuclear magnetic resonance (NMR). Complete backbone assignments and a detailed localization of the secondary structural elements of TM1–TM3 in 50% TFE:water have been achieved.

Abstract

Structural characterization of G protein-coupled receptors (GPCRs) is hindered by the inherent hydrophobicity, flexibility, and large size of these signaling proteins. Insights into conformational preferences and the three- dimensional (3D) structure of domains of these receptors can be obtained using polypeptide fragments of these proteins. Herein, we report the expression, purification, and biophysical characterization of a three- transmembrane domain-containing 131-residue fragment of the yeast a-factor receptor, Ste2p. Ste2p TM1–TM3 (G31–R161) was expressed as a TrpDLE fusion protein in Escherichia coli. The expressed protein was subject to CNBr cleavage to remove the fusion tag and TM1–TM3 was purified by reverse-phased HPLC. The cleavage product was isolated in yields of up to 20 mg per liter of culture in both unlabeled and uniformly [15N]-labeled and [15N, 13C, 2H]-labeled forms. The secondary structure of TM1–TM3 was determined to be helical in a number of membrane mimetic environments,including 2,2,2-trifluoroethanol (TFE):water and lysomyristoylphosphatidylglycerol (LMPG) detergent micelles by circular dichroism. Preliminary HSQC analysis in 50% TFE:water and LMPG micelles prepared in sodium phosphate and 4-(2-hydroxyethyl)-1- piperazine ethanesulfonic acid (HEPES) buffers revealed that this fragment is suitable for structural analysis by nuclear magnetic resonance (NMR). Complete backbone assignments and a detailed localization of the secondary structural elements of TM1–TM3 in 50% TFE:water have been achieved.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Uncontrolled Keywords:GPCR NMR biophysics
Language:English
Date:2011
Deposited On:15 Nov 2011 12:04
Last Modified:05 Apr 2016 15:05
Publisher:Wiley-Blackwell
ISSN:0006-3525
Publisher DOI:https://doi.org/10.1002/bip.21614
PubMed ID:21695690

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