Di-tyrosine cross-link decreases the collisional cross-section of a? peptide dimers and trimers in the gas phase: an ion mobility study.

ABSTRACT: Oligomeric forms of A? peptide are most likely the main synaptotoxic and neurotoxic agent in Alzheimer's disease. Toxicity of various A? oligomeric forms has been confirmed in vivo and also in vitro. However, in vitro preparations were found to be orders of magnitude less toxic than oligomers obtained from in vivo sources. This difference can be explained by the presence of a covalent cross-link, which would stabilize the oligomer. In the present work, we have characterized the structural properties of A? dimers and trimers stabilized by di- and tri-tyrosine cross-links. Using ion mobility mass spectrometry we have compared the collisional cross-section of non-cross-linked and cross-linked species. We have found that the presence of cross-links does not generate new unique forms but rather shifts the equilibrium towards more compact oligomer types that can also be detected for non-cross-linked peptide. In consequence, more extended forms, probable precursors of off-pathway oligomeric species, become relatively destabilized in cross-linked oligomers and the pathway of oligomer evolution becomes redirected towards fibrillar structures.

SUBMITTER: Sitkiewicz E 

PROVIDER: S-EPMC4063900 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature