Structure-Toxicity Relationships of Amyloid Peptide Oligomers
Bibliographic record
Abstract
It has been suggested that these non-fibrillar assemblies may be a common element of all amyloid diseases, and non-fibrillar oligomers formed by several amyloid proteins have been identified in vivo or produced in vitro. Regardless of protein sequence, these oligomers share several key features, including reactivity to structural antibodies, the ability to permeabilize model membranes, and cytotoxicity to cultured neurons. However, despite their potential importance in the pathogenesis of amyloid diseases, the details of the molecular structure of these non-fibrillar oligomers are only now beginning to emerge, as is their relationship to mature fibrils, and to the onset of disease. The mechanism or mechanisms through which these oligomeric species induce cell death and contribute to the pathology of amyloid diseases remain a matter of some debate. Current hypotheses include a physical disruption of cellular membranes, formation of amyloid pores or channels, induction of oxidative stress, or interactions with receptor proteins on the cell surface leading to either altered protein function, or the initiation of a signaling event. Defining the link between the structure of misfolded protein aggregates and the concurrent gain of a toxic functionality is inhibited by the inherent difficulties of studying aggregative proteins, and is further complicated by the ability of amyloid proteins and peptides to form several distinct types of oligomers and fibrils, which often exist as heterogeneous mixtures. Each species of aggregate may exhibit varied biological activity, different local structure or gross morphology and typically contains different numbers of monomers per assembly. Despite these challenges, there has been significant recent progress in obtaining high-resolution structural details of amyloid fibrils and non-fibrillar oligomers, and in defining their biological mode of action. In this chapter, we review the current knowledge of the structure-toxicity relationship of non-fibrillar amyloid oligomers.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".