scholarly journals Molten globule as an intermediate on the human prostatic phosphatase folding pathway.

1997 ◽  
Vol 44 (4) ◽  
pp. 645-657 ◽  
Author(s):  
R Kuciel ◽  
A Mazurkiewicz
Keyword(s):  
Chromatographic Analysis ◽  
Molten Globule ◽  
Prostatic Acid Phosphatase ◽  
Water Soluble ◽  
Folding Pathway ◽  
Molten Globule State ◽  
Folding Intermediates ◽  
Beta Structure ◽  
Lipid Structures ◽  
Hydrophobic Probe

Human prostatic acid phosphatase (hPAP, EC.3.1.3.2), a secretory homodimeric protein was denatured in 6 M urea, pH 2.5, and refolded by dilution at pH 7.2 with recovery of the enzymatic activity and dimeric structure. Circular dichroism, intrinsic fluorescence and chromatographic analysis of renaturating protein suggested that the kinetic intermediate of the hPAP folding is a monomer which displays a molten globule state (R. Kuciel, A. Mazurkiewicz & W.S. Ostrowski, 1996, Int. J. Biol. Macromol. 18, 167-175). To confirm these data experiments were performed to estimate the interaction of the renaturating protein with dyes and amphipathic lipid structures. Increased binding of the hydrophobic probe 1-anilinonaphthalene-8-sulfonate and Congo Red to the refolding enzyme supported the existence of molten globule state with the relaxed beta-structure in the renaturating protein. Presence of liposomes, included in the renaturation mixture as a model of acid phospholipid, resulted in perturbations of the human PAP refolding process. Some folding intermediates were bound to phosphatidylserine liposomes or, alternatively, water soluble, inactive aggregates were formed.

scholarly journals Synthesis runs counter to directional folding of a nascent protein domain

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiuqi Chen ◽  
Nandakumar Rajasekaran ◽  
Kaixian Liu ◽  
Christian M. Kaiser
Keyword(s):  
Single Molecule ◽  
Molten Globule ◽  
Elongation Factor ◽  
Protein Domain ◽  
Folding Pathway ◽  
Native Structure ◽  
Folding Intermediates ◽  
C Terminus

Abstract Folding of individual domains in large proteins during translation helps to avoid otherwise prevalent inter-domain misfolding. How folding intermediates observed in vitro for the majority of proteins relate to co-translational folding remains unclear. Combining in vivo and single-molecule experiments, we followed the co-translational folding of the G-domain, encompassing the first 293 amino acids of elongation factor G. Surprisingly, the domain remains unfolded until it is fully synthesized, without collapsing into molten globule-like states or forming stable intermediates. Upon fully emerging from the ribosome, the G-domain transitions to its stable native structure via folding intermediates. Our results suggest a strictly sequential folding pathway initiating from the C-terminus. Folding and synthesis thus proceed in opposite directions. The folding mechanism is likely imposed by the final structure and might have evolved to ensure efficient, timely folding of a highly abundant and essential protein.

scholarly journals Synthesis runs counter to directional folding of a nascent protein domain

2020 ◽  
Author(s):  
Xiuqi Chen ◽  
Nandakumar Rajasekaran ◽  
Kaixian Liu ◽  
Christian M. Kaiser
Keyword(s):  
Single Molecule ◽  
Molten Globule ◽  
Elongation Factor ◽  
Protein Domain ◽  
Folding Pathway ◽  
Native Structure ◽  
Folding Intermediates ◽  
C Terminus

AbstractFolding of individual domains in large proteins during translation helps to avoid otherwise prevalent inter-domain misfolding. How folding intermediates observed in vitro for the majority of proteins relate to co-translational folding remains unclear. Combining in vivo and single-molecule experiments, we followed the co-translational folding of the G-domain, encompassing the first 293 amino acids of elongation factor G. Surprisingly, the domain remains unfolded until it is fully synthesized, without collapsing into molten globule-like states or forming stable intermediates. Upon fully emerging from the ribosome, the G-domain transitions to its stable native structure via folding intermediates. Our results suggest a strictly sequential folding pathway initiating from the C-terminus. Folding and synthesis thus proceed in opposite directions. The folding mechanism is likely imposed by the final structure and might have evolved to ensure efficient, timely folding of a highly abundant and essential protein.

Kinetic and equilibrium folding intermediates

1995 ◽  
Vol 348 (1323) ◽  
pp. 35-41 ◽  
Keyword(s):  
Protein Folding ◽  
Molten Globule ◽  
Low Dielectric Constant ◽  
The Novel ◽  
Folding Intermediate ◽  
Molten Globule State ◽  
Folding Intermediates ◽  
First Order ◽  
Low Dielectric ◽  
First Order Phase

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.

Conformational and Dynamic Characterization of the Molten Globule State of an Apomyoglobin Mutant with an Altered Folding Pathway†

Biochemistry ◽  
2001 ◽  
Vol 40 (48) ◽  
pp. 14459-14467 ◽  
Author(s):  
Silvia Cavagnero ◽  
Chiaki Nishimura ◽  
Stephan Schwarzinger ◽  
H. Jane Dyson ◽  
Peter E. Wright
Keyword(s):  
Molten Globule ◽  
Folding Pathway ◽  
Dynamic Characterization ◽  
Molten Globule State

Unfolding of the molten globule state of .alpha.-lactalbumin studied by proton NMR

Biochemistry ◽  
1993 ◽  
Vol 32 (48) ◽  
pp. 13198-13203 ◽  
Author(s):  
Akio Shimizu ◽  
Masamichi Ikeguchi ◽  
Shintaro Sugai
Keyword(s):  
Molten Globule ◽  
Proton Nmr ◽  
Molten Globule State ◽  
Alpha Lactalbumin
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