Kinetic and thermodynamic stability of bacterial intracellular aggregates.
Protein aggregation is related to many human disorders and constitutes a major bottleneck in protein production. However, little is known about the conformational properties of in vivo formed aggregates and how they relate to the specific polypeptides embedded in them. Here, we show that the kinetic and thermodynamic stability of the inclusion bodies formed by the Abeta42 Alzheimer peptide and its Asp19 alloform differ significantly and correlate with their amyloidogenic propensity and solubility inside the cell. Our results indicate that the nature of the polypeptide chain determines the specific conformational properties of intracellular aggregates. This implies that different protein inclusions impose dissimilar challenges to the cellular quality-control machinery.
Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Alba
A
Espargaró
Raimon
R
Sabaté
Salvador
S
Ventura
D016229:Amyloid beta-Peptides / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001120:Arginine / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D002479:Inclusion Bodies / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D007700:Kinetics; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017510:Protein Folding; D017433:Protein Structure, Secondary; D013816:Thermodynamics
D016229:Amyloid beta-Peptides; D010446:Peptide Fragments; C075222:amyloid beta-protein (1-42); D001120:Arginine