Intrinsically disordered proteins (IDPs) are systematically under-represented in structural proteomics studies. Their structural characterization implies description of the dynamic conformational ensembles populated by these polymers in solution, posing major challenges to biophysical methods. “Native” MS (native-MS) has emerged as a central tool in this field, conjugating the unique MS analytical power with structurally meaningful descriptors, like solvent-accessible surface area (SASA) and collisional cross section (CCS). This review summarizes recently published papers comparing native-MS and solution methods, with a focus on charge-state-distribution (CSD) analysis for IDP conformational analysis. The results point to substantial agreement, supporting structural interpretation of native-MS spectra of IDPs. The discussion is integrated with data from our group on “synthetic” IDPs, obtained by reduction and alkylation of natively folded proteins, whose fold is stabilized by disulfide bridges. Finally, an MS-based compaction index (CI) is introduced, evaluating SASA with reference to globular and fully disorder proteins. Such a parameter can be calculated for single conformers or the whole conformational ensemble, offering a continuous index for IDP comparison and classification.

Santambrogio, C., Natalello, A., Brocca, S., Ponzini, E., Grandori, R. (2019). Conformational characterization and classification of intrinsically disordered proteins by native mass spectrometry and charge-state distribution analysis. PROTEOMICS, 19(6) [10.1002/pmic.201800060].

Conformational characterization and classification of intrinsically disordered proteins by native mass spectrometry and charge-state distribution analysis

Santambrogio, Carlo
Primo
;
Natalello, Antonino;Brocca, Stefania;Ponzini, Erika;Grandori, Rita
2019

Abstract

Intrinsically disordered proteins (IDPs) are systematically under-represented in structural proteomics studies. Their structural characterization implies description of the dynamic conformational ensembles populated by these polymers in solution, posing major challenges to biophysical methods. “Native” MS (native-MS) has emerged as a central tool in this field, conjugating the unique MS analytical power with structurally meaningful descriptors, like solvent-accessible surface area (SASA) and collisional cross section (CCS). This review summarizes recently published papers comparing native-MS and solution methods, with a focus on charge-state-distribution (CSD) analysis for IDP conformational analysis. The results point to substantial agreement, supporting structural interpretation of native-MS spectra of IDPs. The discussion is integrated with data from our group on “synthetic” IDPs, obtained by reduction and alkylation of natively folded proteins, whose fold is stabilized by disulfide bridges. Finally, an MS-based compaction index (CI) is introduced, evaluating SASA with reference to globular and fully disorder proteins. Such a parameter can be calculated for single conformers or the whole conformational ensemble, offering a continuous index for IDP comparison and classification.
Articolo in rivista - Review Essay
Compaction index; Nano-electrospray-ionization; Protein conformational ensemble; Solvent accessible surface area; Synthetic IDPs;
English
26-ott-2018
2019
19
6
1800060
reserved
Santambrogio, C., Natalello, A., Brocca, S., Ponzini, E., Grandori, R. (2019). Conformational characterization and classification of intrinsically disordered proteins by native mass spectrometry and charge-state distribution analysis. PROTEOMICS, 19(6) [10.1002/pmic.201800060].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/218289
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