Folding−Unfolding Equilibrium and Kinetics of Equine β-Lactoglobulin:  Equivalence between the Equilibrium Molten Globule State and a Burst-Phase Folding Intermediate†

Biochemistry ◽  
1999 ◽  
Vol 38 (14) ◽  
pp. 4455-4463 ◽  
Author(s):  
Kazuo Fujiwara ◽  
Munehito Arai ◽  
Akio Shimizu ◽  
Masamichi Ikeguchi ◽  
Kunihiro Kuwajima ◽  
...  

Our recent experiments on the molten globule state and other protein folding intermediates lead to following conclusions: (i) the molten globule is separated by intramolecular first-order phase transitions from the native and unfolded states and therefore is a specific thermodynamic state of protein molecules; (ii) the novel equilibrium folding intermediate (the ‘pre-molten globule’ state) exists which can be similar to the ‘burst’ kinetic intermediate of protein folding; (iii) proteins denature and release their non-polar ligands at moderately low pH and moderately low dielectric constant, i.e. under conditions which may be related to those near membranes.


Author(s):  
Masamichi Ikeguchi ◽  
Shin-ichi Kato ◽  
Akio Shimizu ◽  
Shintaro Sugai

2003 ◽  
Vol 17 (2-3) ◽  
pp. 183-193 ◽  
Author(s):  
Masaharu Nakao ◽  
Munehito Arai ◽  
Takumi Koshiba ◽  
Katsutoshi Nitta ◽  
Kunihiro Kuwajima

We have studied the guanidine hydrochloride‒induced equilibrium unfolding and the kinetics of refolding of canine milk lysozyme by circular dichroism and fluorescence spectroscopy. The thermodynamic analysis of the equilibrium unfolding measured by circular dichroism and fluorescence has shown that unfolding is represented by a three‒state mechanism and that the intermediate state of canine milk lysozyme is remarkably more stable than the intermediates observed in other lysozyme and α-lactalbumin. In the kinetic refolding of this protein, there are at least two kinetic intermediates; a burst=phase intermediate accumulated within the dead time (4 ms) of the measurement and an intermediate that has been observed during the kinetics with a rate constant of 10–20 s–1after the burst phase. This result is apparently in contrast with those previously observed in the kinetic refolding of α‒lactalbumin and equine lysozyme that show only the burst‒phase intermediate. The relationship between the extraordinarily stable equilibrium molten globule and the kinetic folding intermediates will be discussed.


2010 ◽  
Vol 119 (4) ◽  
pp. 1550-1556 ◽  
Author(s):  
Laurette Tavel ◽  
Céline Moreau ◽  
Saïd Bouhallab ◽  
Eunice C.Y. Li-Chan ◽  
Elisabeth Guichard

2000 ◽  
Vol 40 (supplement) ◽  
pp. S160
Author(s):  
Y. Kobashigawa ◽  
M Mizuguchi ◽  
M. Demura ◽  
T. Koshiba ◽  
S. Tsuda ◽  
...  

Biochemistry ◽  
2006 ◽  
Vol 45 (51) ◽  
pp. 15468-15473 ◽  
Author(s):  
Kanako Nakagawa ◽  
Akihito Tokushima ◽  
Kazuo Fujiwara ◽  
Masamichi Ikeguchi

2012 ◽  
Vol 27 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Dong XU ◽  
Jun ZHANG ◽  
Gang LI ◽  
Penny XIAO ◽  
Paul WEBLEY ◽  
...  

Biochemistry ◽  
1993 ◽  
Vol 32 (48) ◽  
pp. 13198-13203 ◽  
Author(s):  
Akio Shimizu ◽  
Masamichi Ikeguchi ◽  
Shintaro Sugai

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