Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-04078-y
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Funding
- ISCRA initiative
- CNRS [IR-RMN FR3050]
- European Research Council (ERC) under the European Union's Horizon research and innovation program (ERC-CoG GA) [648974]
- MC incoming fellowship [624918]
- Italian Ministry of University [FIRB RBFR109EOS]
- Fondazione Cariplo [2016-0489]
- European Research Council (ERC) [648974] Funding Source: European Research Council (ERC)
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Spontaneous aggregation of folded and soluble native proteins in vivo is still a poorly understood process. A prototypic example is the D76N mutant of beta-2 microglobulin (beta 2m) that displays an aggressive aggregation propensity. Here we investigate the dynamics of beta 2m by X-ray crystallography, solid-state NMR, and molecular dynamics simulations to unveil the effects of the D76N mutation. Taken together, our data highlight the presence of minor disordered substates in crystalline beta 2m. The destabilization of the outer strands of D76N beta 2m accounts for the increased aggregation propensity. Furthermore, the computational modeling reveals a network of interactions with residue D76 as a keystone: this model allows predicting the stability of several point mutants. Overall, our study shows how the study of intrinsic dynamics in crystallo can provide crucial answers on protein stability and aggregation propensity. The comprehensive approach here presented may well be suited for the study of other folded amyloidogenic proteins.
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