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We have conducted in vitro reconstitution studyof ferritin from its subunits FerH and FerL. For thereconstitution, FerH was produced from an expression vectorconstruct in Escherichia coli and was purified from a heattreatedcell extract by using one-step column chromatography.FerL was expressed as inclusion bodies. The denatured formof FerL was obtained by a simple washing step of the inclusionbodies with 3 M urea. The reconstitution experiment wasconducted with various molar ratios of urea-denatured FerHand FerL to make the ferritin nanoparticle with a controlledcomposition of FerH and FerL. SDS-PAGE analysis of thereconstituted ferritins revealed that the reconstitution requiredthe presence of more than 40 molar% of FerH in thereconstitution mixture. The assembly of the subunits into theferritin nanoparticle was confirmed by the presence of sphericalparticles with diameter of 10 nm by the atomic force microscopicimage. Further analysis of the particles by using a transmissionelectron microscope revealed that the reconstituted particlesexhibited different percentages of population with dense ironcore. The reconstituted ferritin nanoparticles made with molarratios of [FerH]/[FerL]=100/0 and 60/40 showed that 80 to90% of the particles were apoferritin, devoid of iron core. Onthe contrary, all the particles formed with [FerH]/[FerL]=85/15 were found to contain the iron core. This suggests thatalthough FerH can uptake iron, a minor portion of FerL, notexceeding 40% at most, is required to deposit iron inside the particle.

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