Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5516038 | Protein Expression and Purification | 2017 | 4 Pages |
â¢Recombinant 8 kDa fragment of gelsolin was overexpressed in fusion with intein to increase its stability and solubility.â¢Released by intein-mediated protein cleavage, 8 kDa fragment of gelsolin is obtained with a yield up to 4.25 mg/L.â¢Purified 8 kDa fragment of gelsolin is validated to be amyloidogenic.
A mutation (D187N/Y) in human plasma gelsolin (GSN) leads to the generation of an 8Â kDa GSN fragment (8Â kDa-GSN), and consequently causes the familial amyloidosis of Finnish type. Because of its faster kinetics of amyloid formation under physiologically relevant conditions, 8Â kDa-GSN is used to explore gelsolin amyloidosis and screen small molecules that can disaggregate amyloids. However, the synthetic 8Â kDa-GSN is expensive, and substantial quantities of 8Â kDa-GSN are needed for the screen. Here we report a study to obtain recombinant 8Â kDa-GSN with high yield from Escherichia coli. Firstly, 8Â kDa-GSN in fusion with Mxe GyrA intein was purified by Ni-affinity chromatography. Then 8Â kDa-GSN was released by intein-mediated protein cleavage, and separated from intein by ion-exchange chromatography. The yield of 8Â kDa-GSN was only 1.5Â mg/L from bacterial culture in the previous report, while it was improved to 4.25Â mg/L in our study. Finally, the amyloidogenic property of 8Â kDa-GSN was validated by circular dichroism spectrometry and dynamic light scattering.