Research articles
ScienceAsia 49 (2023): 8-14 |doi:
10.2306/scienceasia1513-1874.2023.110
Expression and purification of human alpha-7 nicotinic
acetylcholine receptor extracellular domain in Pichia pastoris
Phakawat Chusutha, Ponlawoot Raksatb,c, Supot Hannongbuad, Kittikhun Wangkanonte,f,*, Puey Ounjaib,c,*, Thanyada Rungrotmongkola,g,*
ABSTRACT: Human ?-7 nicotinic acetylcholine receptor (?-7 nAChR) is an ion channel that plays a significant
function in neuronal communication and development. Defects of ?-7 nAChR could cause plethora of neurologic
and psychiatric impairments such as schizophrenia, Alzheimer?s, and inflammatory disorders. Hence, ?-7 nAChR is an
interesting candidate for drug development targeting neurological and inflammatory diseases. Therefore, the ability
to obtain significant amount of the ?-7 nAChR extracellular domain is crucial for further biochemical and structural
investigations. We constructed a Pichia pastoris yeast strain that secretes the ?-7 nAChR extracellular domain. The
recombinant protein was hyperglycosylated and could be deglycosylated with Endoglycosidase H treatment. Crosslinking experiments suggested that the recombinant protein could form oligomeric states, consistent with the known
property of the native ?-7 nAChR. The optimized expression yield was 4.9 mg/l.
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| a |
Center of Excellence in Biocatalyst and Sustainable Biotechnology, Department of Biochemistry, Faculty of Science,
Chulalongkorn University, Bangkok 10330 Thailand
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| b |
Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400 Thailand |
| c |
Center of Excellence on Environmental Health and Toxicology (EHT), Office of Higher Education Commission,
Ministry of Education, Bangkok Thailand |
| d |
Computational Chemistry Center of Excellence, Department of Chemistry, Faculty of Science,
Chulalongkorn University, Bangkok 10330 Thailand |
| e |
Center of Excellence for Molecular Biology and Genomics of Shrimp, Department of Biochemistry,
Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand
|
| f |
Center of Excellence for Molecular Crop, Department of Biochemistry, Faculty of Science, Chulalongkorn University,
Bangkok 10330 Thailand |
| g |
Program in Bioinformatics and Computational Biology, Graduate School, Chulalongkorn University,
Bangkok 10330 Thailand |
* Corresponding author, E-mail: kittikhun.w@chula.ac.th, puey.oun@mahidol.edu, thanyada.r@chula.ac.th
Received 16 Feb 2022, Accepted 6 Jun 2022
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