ArticleProtein science : a publication of the Protein Society2006
Sensitivity of secondary structure propensities to sequence differences between alpha- and gamma-synuclein: implications for fibrillation.
Article in Protein science : a publication of the Protein Society, 2006. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 387 papers.
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387 citing papers in PubMed, 735 citations in OpenAlex.
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327 more citing papers are in PubMed but not listed here.
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Authors and funding
4 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The synucleins are a family of intrinsically disordered proteins involved in various human diseases. alpha-Synuclein has been extensively characterized due to its role in Parkinson's disease where it forms intracellular aggregates, while gamma-synuclein is overexpressed in a majority of late-stage breast cancers. Despite fairly strong sequence similarity between the amyloid-forming regions of alpha- and gamma-synuclein, gamma-synuclein has only a weak propensity to form amyloid fibrils. We hypothesize that the different fibrillation tendencies of alpha- and gamma-synuclein may be related to differences in structural propensities. Here we have measured chemical shifts for gamma-synuclein and compared them to previously published shifts for alpha-synuclein. In order to facilitate direct comparison, we have implemented a simple new technique for re-referencing chemical shifts that we have found to be highly effective for both disordered and folded proteins. In addition, we have developed a new method that combines different chemical shifts into a single residue-specific secondary structure propensity (SSP) score. We observe significant differences between alpha- and gamma-synuclein secondary structure propensities. Most interestingly, gamma-synuclein has an increased alpha-helical propensity in the amyloid-forming region that is critical for alpha-synuclein fibrillation, suggesting that increased structural stability in this region may protect against gamma-synuclein aggregation. This comparison of residue-specific secondary structure propensities between intrinsically disordered homologs highlights the sensitivity of transient structure to sequence changes, which we suggest may have been exploited as an evolutionary mechanism for fast modulation of protein structure and, hence, function.
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