期刊
BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS
卷 1864, 期 11, 页码 1489-1499出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbapap.2016.08.002
关键词
Amyloid fibrils; Oligomer; Amyloidogenic regions; Tandem mass spectrometry; Molecular structure; Electron microscopy; X-ray analysis
资金
- Russian Science Foundation [14-14-00536]
- Russian Science Foundation [14-14-00536] Funding Source: Russian Science Foundation
We performed a comparative study of the process of amyloid formation by short homologous peptides with a substitution of aspartate for glutamate in position 2 - VDSWNVLVAG (AspNB) and VESWNVLVAG (GluNB) with unblocked termini. Peptide AspNB (residues 166-175) corresponded to the predicted amyloidogenic region of the protein glucantransferase Bgl2 from the Saccharomyces cerevisiae cell wall. The process of amyloid formation was monitored by fluorescence spectroscopy (FS), electron microscopy (EM), tandem mass spectrometry (TMS), and X-ray diffraction (XD) methods. The experimental study at pH 3.0 revealed formation of amyloid fibrils with similar morphology for both peptides. Moreover, we found that the morphology of fibrils made of untreated ammonia peptide is not mentioned in the literature. This morphology resembles snakes lying side by side in the form of a wave without intertwining. Irrespective of the way of the peptide preparation, the rate of fibril formation is higher for AspNB than for GluNB. However, preliminary treatment with ammonia highly affected fibril morphology especially for AspNB. Such treatment allowed us to obtain a lag period during the process of amyloid formation. It showed that the process was nucleation-dependent. With or without treatment, amyloid fibrils consisted of ring-like oligomers with the diameter of about 6 nm packed either directly ring-to-ring or ring-on-ring with a slight shift. We also proposed the molecular structure of amyloid fibrils for two studied peptides. (C) 2016 Elsevier B.V. All rights reserved.
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