期刊
PROTEIN EXPRESSION AND PURIFICATION
卷 64, 期 1, 页码 55-62出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pep.2008.10.007
关键词
beta-Amyloid42; GST-fusion protein expression; Purification; Aggregation; Neurotoxicity
类别
资金
- National Natural Science Foundation of China [30870727, 30470496]
- Natural Science Foundation of Jiangsu Province [BK2006026]
Alzheimer's disease (AD) is a neurodegenerative disorder characterized by a progressive loss of cognitive function. Evidence indicates that abnormal processing and extracellular deposition of the beta-amyloid42 peptide, the longer form of proteolytic derivative of the transmembrane glycoprotein-amyloid precursor protein (APP), is a key step in the pathogenesis of AD. Since it is convenient and economical to obtain such a peptide biologically, in this study, we report for the first time a method to express in E. coli and purify beta-amyloid42 using glutathione-S-transferase (GST) fusion system. beta-Amyloid42 gene was inserted into a vector pGEX-4T-1 to construct a GST-fusion protein. The fusion protein GST-beta-amyloid42, expressed in BL21 (DE3) strain, was purified with GSH-affinity chromatography followed by thrombin cleavage. The digested product was further purified with an additional GSH-affinity and a Benzamidine chromatography step. After cleavage and purification, the beta-amyloid42 moiety showed the expected size of 4.5 kDa on Tricine-SDS-PAGE, and was further confirmed by Western blot. Moreover, the fibrillar recombinant beta-amyloid42 exhibited great aggregation activity and showed neurotoxicity on neuron cells in vitro. These results suggest that our method will be useful in obtaining a large quantity of recombinant beta-amyloid42 peptide for further physiological and biochemical studies. (C) 2008 Elsevier Inc. All rights reserved.
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