6533b7cffe1ef96bd12599eb
RESEARCH PRODUCT
Stability and disassembly properties of human naïve Hsp60 and bacterial GroEL chaperonins.
RicciC.OrtoreM.g.VilasiS.CarrottaR.MangioneM.r.BuloneD.LibrizziF.SpinozziF.BurgioG.AmenitschH.San BiagioP.l.subject
guanidiniun chloride0301 basic medicineGuanidinium chlorideSmall AngleCircular dichroismBiophysicsmacromolecular substancesBiochemistryGroELChaperoninScatteringMitochondrial Proteins03 medical and health scienceschemistry.chemical_compoundBacterial ProteinsX-Ray DiffractionScattering Small AngleHumansGuanidinebiologyProtein StabilityCircular DichroismOrganic ChemistryTemperatureGroESSAXSChaperonin 60Hsp60GroELSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)CDcited By 5enzymes and coenzymes (carbohydrates)Denaturation030104 developmental biologychemistryBiochemistryChaperone (protein)biological sciencesbiology.proteinCD; Denaturation; GroEL; Guanidinium chloride; Hsp60; SAXS; Bacterial Proteins; Chaperonin 60; Circular Dichroism; Humans; Mitochondrial Proteins; Protein Stability; Scattering Small Angle; Temperature; X-Ray DiffractionbacteriaHSP60Guanidinium chloridedescription
Human Hsp60 chaperonin and its bacterial homolog GroEL, in association with the corresponding co-chaperonins Hsp10 and GroES, constitute important chaperone systems promoting the proper folding of several mitochondrial proteins. Hsp60 is also currently described as a ubiquitous molecule with multiple roles both in health conditions and in several diseases. Naïve Hsp60 bearing the mitochondrial import signal has been recently demonstrated to present different oligomeric organizations with respect to GroEL, suggesting new possible physiological functions. Here we present a combined investigation with circular dichroism and small-angle X-ray scattering of structure, self-organization, and stability of naïve Hsp60 in solution in comparison with bacterial GroEL. Experiments have been performed in different concentrations of guanidine hydrochloride, monitoring the dissociation of tetradecamers into heptamers and monomers, until unfolding. GroEL is proved to be more stable with respect to Hsp60, and the unfolding free energy as well as its dependence on denaturant concentration is obtained. © 2015 Elsevier B.V.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-05-14 | Biophysical chemistry |