Monitoring the interaction between β2-microglobulin and the molecular chaperone αB-crystallin by NMR and mass spectrometry: αB-crystallin dissociates β2-microglobulin oligomers

Gennaro Esposito, Megan Garvey, Vera Alverdi, Fabio Pettirossi, Alessandra Corazza, Federico Fogolari, Maurizio Polano, P. Patrizia Mangione, Sofia Giorgetti, Monica Stoppini, Agata Rekas, Vittorio Bellotti, Albert J.R. Heck, John A. Carver

Research output: Contribution to journalArticle

Abstract

The interaction at neutral pH between wild-type and a variant form (R3A) of the amyloid fibril-forming protein β2-microglobulin (β2m) and the molecular chaperone αB-crystallin was investigated by thioflavin T fluorescence, NMR spectroscopy, and mass spectrometry. Fibril formation of R3Aβ2m was potently prevented by αB-crystallin. αB-crystallin also prevented the unfolding and nonfibrillar aggregation of R3Aβ2m. From analysis of the NMR spectra collected at various R3Aβ2m to αB-crystallin molar subunit ratios, it is concluded that the structured β-sheet core and the apical loops of R3Aβ2m interact in a nonspecific manner with the αB-crystallin. Complementary information was derived from NMR diffusion coefficient measurements of wild-type β2m at a 100-fold concentration excess with respect to αB-crystallin. Mass spectrometry acquired in the native state showed that the onset of wild-type β2m oligomerization was effectively reduced by αB-crystallin. Furthermore, and most importantly, αB-crystallin reversibly dissociated β2m oligomers formed spontaneously in aged samples. These results, coupled with our previous studies, highlight the potent effectiveness of αB-crystallin in preventing β2m aggregation at the various stages of its aggregation pathway. Our findings are highly relevant to the emerging view that molecular chaperone action is intimately involved in the prevention of in vivo amyloid fibril formation.

Original languageEnglish (US)
Pages (from-to)17844-17858
Number of pages15
JournalJournal of Biological Chemistry
Volume288
Issue number24
DOIs
StatePublished - Jun 14 2013

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Crystallins
Molecular Chaperones
Oligomers
Mass spectrometry
Mass Spectrometry
Nuclear magnetic resonance
Monitoring
Agglomeration
Amyloid
Oligomerization
Fluorescence Spectrometry
Nuclear magnetic resonance spectroscopy
Spectrum Analysis
Magnetic Resonance Spectroscopy
Fluorescence

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Monitoring the interaction between β2-microglobulin and the molecular chaperone αB-crystallin by NMR and mass spectrometry : αB-crystallin dissociates β2-microglobulin oligomers. / Esposito, Gennaro; Garvey, Megan; Alverdi, Vera; Pettirossi, Fabio; Corazza, Alessandra; Fogolari, Federico; Polano, Maurizio; Mangione, P. Patrizia; Giorgetti, Sofia; Stoppini, Monica; Rekas, Agata; Bellotti, Vittorio; Heck, Albert J.R.; Carver, John A.

In: Journal of Biological Chemistry, Vol. 288, No. 24, 14.06.2013, p. 17844-17858.

Research output: Contribution to journalArticle

Esposito, G, Garvey, M, Alverdi, V, Pettirossi, F, Corazza, A, Fogolari, F, Polano, M, Mangione, PP, Giorgetti, S, Stoppini, M, Rekas, A, Bellotti, V, Heck, AJR & Carver, JA 2013, 'Monitoring the interaction between β2-microglobulin and the molecular chaperone αB-crystallin by NMR and mass spectrometry: αB-crystallin dissociates β2-microglobulin oligomers', Journal of Biological Chemistry, vol. 288, no. 24, pp. 17844-17858. https://doi.org/10.1074/jbc.M112.448639
Esposito, Gennaro ; Garvey, Megan ; Alverdi, Vera ; Pettirossi, Fabio ; Corazza, Alessandra ; Fogolari, Federico ; Polano, Maurizio ; Mangione, P. Patrizia ; Giorgetti, Sofia ; Stoppini, Monica ; Rekas, Agata ; Bellotti, Vittorio ; Heck, Albert J.R. ; Carver, John A. / Monitoring the interaction between β2-microglobulin and the molecular chaperone αB-crystallin by NMR and mass spectrometry : αB-crystallin dissociates β2-microglobulin oligomers. In: Journal of Biological Chemistry. 2013 ; Vol. 288, No. 24. pp. 17844-17858.
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abstract = "The interaction at neutral pH between wild-type and a variant form (R3A) of the amyloid fibril-forming protein β2-microglobulin (β2m) and the molecular chaperone αB-crystallin was investigated by thioflavin T fluorescence, NMR spectroscopy, and mass spectrometry. Fibril formation of R3Aβ2m was potently prevented by αB-crystallin. αB-crystallin also prevented the unfolding and nonfibrillar aggregation of R3Aβ2m. From analysis of the NMR spectra collected at various R3Aβ2m to αB-crystallin molar subunit ratios, it is concluded that the structured β-sheet core and the apical loops of R3Aβ2m interact in a nonspecific manner with the αB-crystallin. Complementary information was derived from NMR diffusion coefficient measurements of wild-type β2m at a 100-fold concentration excess with respect to αB-crystallin. Mass spectrometry acquired in the native state showed that the onset of wild-type β2m oligomerization was effectively reduced by αB-crystallin. Furthermore, and most importantly, αB-crystallin reversibly dissociated β2m oligomers formed spontaneously in aged samples. These results, coupled with our previous studies, highlight the potent effectiveness of αB-crystallin in preventing β2m aggregation at the various stages of its aggregation pathway. Our findings are highly relevant to the emerging view that molecular chaperone action is intimately involved in the prevention of in vivo amyloid fibril formation.",
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T2 - αB-crystallin dissociates β2-microglobulin oligomers

AU - Esposito, Gennaro

AU - Garvey, Megan

AU - Alverdi, Vera

AU - Pettirossi, Fabio

AU - Corazza, Alessandra

AU - Fogolari, Federico

AU - Polano, Maurizio

AU - Mangione, P. Patrizia

AU - Giorgetti, Sofia

AU - Stoppini, Monica

AU - Rekas, Agata

AU - Bellotti, Vittorio

AU - Heck, Albert J.R.

AU - Carver, John A.

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N2 - The interaction at neutral pH between wild-type and a variant form (R3A) of the amyloid fibril-forming protein β2-microglobulin (β2m) and the molecular chaperone αB-crystallin was investigated by thioflavin T fluorescence, NMR spectroscopy, and mass spectrometry. Fibril formation of R3Aβ2m was potently prevented by αB-crystallin. αB-crystallin also prevented the unfolding and nonfibrillar aggregation of R3Aβ2m. From analysis of the NMR spectra collected at various R3Aβ2m to αB-crystallin molar subunit ratios, it is concluded that the structured β-sheet core and the apical loops of R3Aβ2m interact in a nonspecific manner with the αB-crystallin. Complementary information was derived from NMR diffusion coefficient measurements of wild-type β2m at a 100-fold concentration excess with respect to αB-crystallin. Mass spectrometry acquired in the native state showed that the onset of wild-type β2m oligomerization was effectively reduced by αB-crystallin. Furthermore, and most importantly, αB-crystallin reversibly dissociated β2m oligomers formed spontaneously in aged samples. These results, coupled with our previous studies, highlight the potent effectiveness of αB-crystallin in preventing β2m aggregation at the various stages of its aggregation pathway. Our findings are highly relevant to the emerging view that molecular chaperone action is intimately involved in the prevention of in vivo amyloid fibril formation.

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