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Title: Purification and structural characterization of the voltage-sensor domain of the hERG potassium channel
Authors: Ng, Hui Qi
Kim, Young Mee
Huang, Qiwei
Gayen, Shovanlal
Yildiz, Ahu Arslan
Yoon, Ho Sup
Sinner, Eva-Kathrin
Kang, CongBao
Keywords: DRNTU::Science::Biological sciences
Issue Date: 2012
Source: Ng, H. Q., Kim, Y. M., Huang, Q., Gayen, S., Yildiz, A. A., Yoon, H. S. (2012). Purification and structural characterization of the voltage-sensor domain of the hERG potassium channel. Protein Expression and Purification, 86(2), 98–104.
Series/Report no.: Protein expression and purification
Abstract: The hERG (human ether à go-go related gene) potassium channel is a voltage-gated potassium channel playing important roles in the heart by controlling the rapid delayed rectifier potassium current. The hERG protein contains a voltage-sensor domain (VSD) that is important for sensing voltage changes across the membrane. Mutations in this domain contribute to serious heart diseases. To study the structure of the VSD, it was over-expressed in Escherichia coli and purified into detergent micelles. Lyso-myristoyl phosphatidylglycerol (LMPG) was shown to be a suitable detergent for VSD purification and folding. Secondary structural analysis using circular dichroism (CD) spectroscopy indicated that the purified VSD in LMPG micelles adopted α-helical structures. Purified VSD in LMPG micelles produced dispersed cross-peaks in a 15N-HSQC spectrum. Backbone resonance assignments for residues from transmembrane segments S3 and S4 of VSD also confirmed the presence of α-helical structures in this domain. Our results demonstrated that structure of VSD can be investigated using NMR spectroscopy.
ISSN: 1046-5928
DOI: 10.1016/j.pep.2012.09.003
Rights: © 2012 Elsevier Inc.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SBS Journal Articles


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