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Salt-Inducing Assembly Polymorphism Strategy for Cytotoxicity Differentiation of Phenol-Soluble Modulin α3 Assemblies. | LitMetric

AI Article Synopsis

Article Abstract

Phenol-soluble modulin α3 (PSMα3) can self-assemble into fibrous assemblies with a unique "cross-α" sheet structure, which serves as a key virulence factor in the infection of . However, the structure-cytotoxicity relationships of PSMα3 still remain elusive. Herein, we utilized the strategy of salt-inducing assembly polymorphism to controllably prepare three PSMα3 assemblies with morphological and structural distinctions, including amorphous aggregates (AAs), rigid fibrils (RFs), and oligomers/curvilinear fibrils (OCFs), which provided a convincing method to facilitate the structure-cytotoxicity investigation of PSMα3 assemblies. Our results affirmed that amyloid fibrillation was essential for the enhancement of PSMα3 cytotoxicity, which was proved based on the evidence that RFs and OCFs both triggered more obvious cytotoxicity than AAs. Furthermore, our study also demonstrated that the cytotoxicity was severely dependent on the size and structure of PSMα3 fibrils. In detail, smaller OCFs rich in α-helices exhibited stronger virulence than RFs with larger sizes and low α-helical contents. The cytotoxicity caused by such fibrils was achieved via a membrane-disrupting mechanism, in which RFs and OCFs might be prone to membrane thinning and perforation, respectively. This strategy of salt-inducing PSMα3 assembly polymorphism facilitated the comprehension of the relationship between the characteristics of PSMα3 assemblies and their cytotoxicity and was also helpful to understanding the intrinsic assembly mechanism of the PSMα3.

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http://dx.doi.org/10.1021/acs.biomac.2c00431DOI Listing

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