title: Inclusion bodies: specificity in their aggregation process and amyloid-like structure.
abstract: The accumulation of aggregated protein in the cell is associated with the pathology of many diseases and constitutes a major concern in protein production. Intracellular aggregates have been traditionally regarded as nonspecific associations of misfolded polypeptides. This view is challenged by studies demonstrating that, in vitro, aggregation often involves specific interactions. However, little is known about the specificity of in vivo protein deposition. Here, we investigate the degree of in vivo co-aggregation between two self-aggregating proteins, Abeta42 amyloid peptide and foot-and-mouth disease virus VP1 capsid protein, in prokaryotic cells. In addition, the ultrastructure of intracellular aggregates is explored to decipher whether amyloid fibrils and intracellular protein inclusions share structural properties. The data indicate that in vivo protein aggregation exhibits a remarkable specificity that depends on the establishment of selective interactions and results in the formation of oligomeric and fibrillar structures displaying amyloid-like properties. These features allow prokaryotic Abeta42 intracellular aggregates to act as effective seeds in the formation of Abeta42 amyloid fibrils. Overall, our results suggest that conserved mechanisms underlie protein aggregation in different organisms. They also have important implications for biotechnological and biomedical applications of recombinant polypeptides.
authors.affiliation: Institut de Biotecnologia i de Biomedicina, Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, Spain.
authors.forename: Montse
authors.initials: M
authors.lastname: Morell
authors.forename: Ramona
authors.initials: R
authors.lastname: Bravo
authors.forename: Alba
authors.initials: A
authors.lastname: Espargaró
authors.forename: Xavier
authors.initials: X
authors.lastname: Sisquella
authors.forename: Francesc X
authors.initials: FX
authors.lastname: Avilés
authors.forename: Xavier
authors.initials: X
authors.lastname: Fernàndez-Busquets
authors.forename: Salvador
authors.initials: S
authors.lastname: Ventura
mesh_terms: D016229:Amyloid beta-Peptides / Q000145:classification / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D002479:Inclusion Bodies / Q000378:metabolism* / Q000648:ultrastructure; D007700:Kinetics; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D010446:Peptide Fragments / Q000145:classification / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D011485:Protein Binding; D013379:Substrate Specificity
chemical_list: D016229:Amyloid beta-Peptides; D010446:Peptide Fragments; C075222:amyloid beta-protein (1-42)