Multi-domain misfolding: understanding the aggregation pathway of polyglutamine proteins.

@article{Saunders2009MultidomainMU,
  title={Multi-domain misfolding: understanding the aggregation pathway of polyglutamine proteins.},
  author={Helen M Saunders and Stephen P. Bottomley},
  journal={Protein engineering, design \& selection : PEDS},
  year={2009},
  volume={22 8},
  pages={
          447-51
        }
}
The polyglutamine (polyQ) diseases consist of nine neurodegenerative diseases in which a polyQ tract expansion leads to protein misfolding and subsequent aggregation. Even when the causative proteins have the same length polyQ tract, there are differences in the severity and age of disease onset which implicate the polyQ flanking sequences as modulators of disease. Recent studies on the polyQ proteins ataxin-1, ataxin-3 and huntingtin exon-1 have shown that the flanking domains have an… 

Figures and Tables from this paper

PolyQ: a database describing the sequence and domain context of polyglutamine repeats in proteins
TLDR
A database, PolyQ, is constructed that can be interrogated such that the sequence context of polyglutamine repeats in disease and non-disease associated proteins can be investigated.
Polyglutamine Induced Misfolding of Huntingtin Exon1 is Modulated by the Flanking Sequences
TLDR
The molecular dynamics study provides a structural insight of XN1 misfolding and elucidates the possible role of the flanking sequences inXN1 aggregation.
Flanking domain stability modulates the aggregation kinetics of a polyglutamine disease protein
TLDR
The hypothesis that the first stage of ataxin‐3 fibrillogenesis is caused by interactions involving the non‐polyQ containing Josephin domain and that the thermodynamic stability of this domain is linked to the aggregation propensity of atX‐3 is supported.
Neurotoxic protein oligomerisation associated with polyglutamine diseases
TLDR
Initial evidence suggests that conformational changes induced by polyQ expansions and their surrounding sequence lead to the formation of particular oligomeric intermediates that may differentially affect neurotoxicity.
Proteins Containing Expanded Polyglutamine Tracts and Neurodegenerative Disease.
Several hereditary neurological and neuromuscular diseases are caused by an abnormal expansion of trinucleotide repeats. To date, there have been 10 of these trinucleotide repeat disorders associated
Conformational diseases: structural studies of aggregation of polyglutamine proteins.
TLDR
This contribution reviews studies, integrating computational and experimental approaches, of polyQ proteins, as well as of the details of the complicate aggregation mechanisms in which aberrant form ofpolyQ proteins are involved and can shed light on putative therapeutic targets and future development of aggregation inhibitors.
Toward understanding the role of protein context in the polyglutamine disease, SCA3
TLDR
The role that protein context plays in the polyglutamine disease, Spinocerebellar ataxia type 3 (SCA3), is explored and biochemical, cell-based, and animal models are utilized to gain a broader understanding of the SCA3 disease protein, ataxin-3, and tools for further exploration of the molecular properties of ataxIn-3 that modulate its toxicity during disease are generated.
Modeling the polyglutamine aggregation pathway in Huntington's disease: from basic studies to clinical applications.
  • K. Sugaya
  • Biology
    Sub-cellular biochemistry
  • 2012
TLDR
Two risk-based stochastic kinetic models that describe genotype-phenotype correlations in patients with polyQ diseases and reflect alternative pathways of polyQ aggregation are described, and a mathematical model by which the time course of neurodegeneration in HD can be precisely predicted is presented.
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 92 REFERENCES
The structural impact of a polyglutamine tract is location-dependent.
TLDR
It is concluded that protein misfolding within the polyQ tract itself is the driving force behind the key characteristics of polyQ disease, and that structural perturbation of flanking domains is not required.
Polyglutamine Expansion in Ataxin-3 Does Not Affect Protein Stability
TLDR
A new model for the aggregation process in which the pathways of un/folding and misfolding are distinct and separate is developed, given that native state stability is unaffected by polyglutamine length, and given the possible role and influence of other factors in the fibrillization of ataxin-3.
Oligoproline effects on polyglutamine conformation and aggregation.
The Role of Protein Composition in Specifying Nuclear Inclusion Formation in Polyglutamine Disease*
TLDR
It is demonstrated that the protein sequence surrounding polyQ specifies the constituents of nuclear inclusions (NI) formed by the disease protein ataxin-3, and that protein context-dependent recruitment of nuclear proteins to intranuclear microaggregates, and subsequently to NI, may contribute to selective neurotoxicity in polyQ diseases.
Polyglutamine disruption of the huntingtin exon1 N-terminus triggers a complex aggregation mechanism
TLDR
It is shown that the 17-amino-acid flanking sequence N-terminal to the polyQ in the toxic huntingtin exon 1 fragment imparts onto this peptide a complex alternative aggregation mechanism that greatly enhances its aggregation into globular oligomers with HTTNT cores and exposed polyQ.
In-cell Aggregation of a Polyglutamine-containing Chimera Is a Multistep Process Initiated by the Flanking Sequence*
TLDR
The Q53 chimera aggregates in cells via a multistep process point to an evolution of the dominant sequences in intracellular aggregates and may provide molecular insight into origins of toxic prefibrillar aggregates.
Flanking sequences profoundly alter polyglutamine toxicity in yeast.
TLDR
Using a yeast model, this work finds that sequences flanking the polyQ region of human huntingtin exon I can convert a benign protein to a toxic species and vice versa, and observes that flanking sequences can direct polyQ misfolding to at least two morphologically distinct types of polyQ aggregates.
...
1
2
3
4
5
...