Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34484
標題: Cold instability of aponeocarzinostatin and its stabilization by labile chromophore
作者: Jayachithra, K.
金德航
Kumar, T.K.S.
Lu, T.J.
Yu, C.
Chin, D.H.
陸大榮
關鍵字: non-protein chromophore
3-dimensional solution structure
free-energy
changes
beta-sheet protein
apo-neocarzinostatin
thermodynamic
characterization
streptomyces-carzinostaticus
antibiotic
neocarzinostatin
deoxyribonucleic-acid
linear extrapolation
期刊/報告no:: Biophysical Journal, Volume 88, Issue 6, Page(s) 4252-4261.
摘要: The conformational stability of aponeocarzinostatin, an all-beta-sheet protein with 113 amino-acid residues, is investigated by thermal-induced equilibrium unfolding between pH 2.0 and 10.0 with and without urea. At room temperature, the protein is stable in a pH range of 4.0-10.0, whereas the stability of the protein drastically decreases below pH 4.0. The thermal unfolding of aponeocarzinostatin is reversible and follows a two-state mechanism. By two-dimensional unfolding studies, the enthalpy change, heat capacity change, and free energy change for unfolding of the protein are estimated. Circular dichroism profiles suggest that this protein undergoes both heat- and cold-induced unfolding. The ellipticity changes at far- and near-UV circular dichroism suggest that the tertiary structure is disrupted but the secondary structure remains folded at low temperatures. Interestingly, the labile enediyne chromophore, which is highly stabilized by the protein, is able to protect the protein against cold-induced unfolding, but not the heat- induced unfolding.
URI: http://hdl.handle.net/11455/34484
ISSN: 0006-3495
文章連結: http://dx.doi.org/10.1529/biophysj.104.051722
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