Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/70165
標題: Protein folding by a quasi-static-like process: A first-order state transition
作者: Chang, C.C.
Su, Y.C.
Cheng, M.S.
Kan, L.S.
關鍵字: porcine growth-hormone
circular-dichroism
hydrogen-exchange
escherichia-coli
inclusion-bodies
molten globule
kinetics
intermediate
spectroscopy
molecules
期刊/報告no:: Physical Review E, Volume 66, Issue 2.
摘要: In this paper we report that quasi-static-like processes, in which stable intermediates were introduced carefully and deliberately, may be used to reversibly unfold and refold purified native porcine growth hormone. Through circular dichroism (CD) and dynamic light scattering (DLS), we were able to study the secondary structure conformational changes, tertiary structure thermal stabilities, and the particle size distributions of both the intermediates and the final folded product. The CD data showed that the secondary structure was restored in the initial folding stage, whereas the tertiary structure within the protein was restored one step before the last folding stage, as elucidated by thermal stability experiments. DLS analysis suggested that the average hydrodynamic radii of the folding intermediates shrunk to nativelike size immediately after the first folding stage. Our data suggested that the denaturant-containing protein folding reaction is a first-order-like state transition process. This quasi-static-like process may be useful in the prevention of aggregate formation in protein purification and thus can be used in protein engineering to improve the overall yield from harvesting proteins.
URI: http://hdl.handle.net/11455/70165
ISSN: 1539-3755
文章連結: http://dx.doi.org/10.1103/PhysRevE.66.021903
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