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dc.contributor.authorSirisak Lolupimanen_US
dc.contributor.authorPilaiwan Siripurkpongen_US
dc.contributor.authorJirundon Yuvaniyamaen_US
dc.contributor.otherMahidol Universityen_US
dc.contributor.otherThammasat Universityen_US
dc.identifier.citationPLoS ONE. Vol.9, No.2 (2014)en_US
dc.description.abstractPlasmodium falciparum plasmepsin-I (PM-I) has been considered a potential drug target for the parasite that causes fatal malaria in human. Determination of PM-I structures for rational design of its inhibitors is hindered by the difficulty in obtaining large quantity of soluble enzyme. Nearly all attempts for its heterologous expression in Escherichia coli result in the production of insoluble proteins in both semi-pro-PM-I and its truncated form, and thus require protein refolding. Moreover, the yields of purified, soluble PM-I from all reported studies are very limited. Exclusion of truncated semi-pro-PM-I expression in E. coli C41(DE3) is herein reported. We also show that the low preparation yield of purified semi-pro-PM-I with autoprocessing ability is mainly a result of structural instability of the refolded enzyme in acidic conditions due to incomplete formation of disulfide linkages. Upon formation of at least one of the two natural disulfide bonds, nearly all of the refolded semi-pro-PM-I could be activated to its mature form. A significantly improved yield of 10 mg of semi-pro-PM-I per liter of culture, which resulted in 6-8 mg of the mature PM-I, was routinely obtained using this strategy. © 2014 Lolupiman et al.en_US
dc.rightsMahidol Universityen_US
dc.subjectAgricultural and Biological Sciencesen_US
dc.subjectBiochemistry, Genetics and Molecular Biologyen_US
dc.titleDisulfide Linkages in Plasmodium falciparum plasmepsin-I are essential elements for its processing activity and multi-milligram recombinant production yielden_US
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