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RESEARCH PRODUCT
Quantitative analysis of the impact of a human pathogenic mutation on the CCT5 chaperonin subunit using a proxy archaeal ortholog
Alberto J. L. MacarioAdrián Velázquez-campoyJatin NarangDario SpigolonDario SpigolonFrank T. RobbEverly Conway De MacarioDonatella BuloneFrancesco CappelloD. Travis GallagherPier Luigi San Biagiosubject
0301 basic medicineProtein subunitMutantBiophysicsHeterologousBiochemistryChaperoninChaperoninlcsh:Biochemistry03 medical and health sciencesDSC differential scanning calorimetryCCT% chaperoninPf Pyrococcus furiosusDenaturation (biochemistry)lcsh:QD415-436Molecular Biologylcsh:QH301-705.5DLS dynamic light scatteringbiologyITC isothermal titration calorimetryWild typeIsothermal titration calorimetryCell BiologyChaperonopathiesbiology.organism_classificationProtein calorimetryNeuropathyPyrococcus furiosus030104 developmental biologyBiochemistryBiophysiclcsh:Biology (General)Pyrococcus furiosusChaperonopathieCCT5; Chaperonin; Chaperonopathies; Neuropathy; Protein calorimetry; Pyrococcus furiosus; Biophysics; Biochemistry; Molecular Biology; Cell BiologyCCT5Pyrococcus furiosuResearch ArticlePf-CD1 Pyrococcus furiosus chaperonin subunit with the last 22 amino acids deleteddescription
The human chaperonin complex is a ~ 1 MDa nanomachine composed of two octameric rings formed from eight similar but non-identical subunits called CCT. Here, we are elucidating the mechanism of a heritable CCT5 subunit mutation that causes profound neuropathy in humans. In previous work, we introduced an equivalent mutation in an archaeal chaperonin that assembles into two octameric rings like in humans but in which all subunits are identical. We reported that the hexadecamer formed by the mutant subunit is unstable with impaired chaperoning functions. This study quantifies the loss of structural stability in the hexadecamer due to the pathogenic mutation, using differential scanning calorimetry (DSC) and isothermal titration calorimetry (ITC). The disassembly of the wild type complex, which is tightly coupled with subunit denaturation, was decoupled by the mutation without affecting the stability of individual subunits. Our results verify the effectiveness of the homo-hexadecameric archaeal chaperonin as a proxy to assess the impact of subtle defects in heterologous systems with mutations in a single subunit.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-09-01 | Biochemistry and Biophysics Reports |