Abstract
Short peptides have been identified from amyloidogenic proteins that form amyloid fibrils in isolation. The hexapeptide stretch 21DIDLHL26 has been shown to be important in the self-assembly of the Src homology 3 (SH3) domain of p85α subunit of bovine phosphatidylinositol-3-kinase (PI3-SH3). The SH3 domain of chicken brain α-spectrin, which is otherwise non-amyloidogenic, is rendered amyloidogenic if 22EVTMKK27 is replaced by DIDLHL. In this article, we describe the aggregation behaviour of DIDLHL-COOH and DIDLHL-CONH2. Our results indicate that DIDLHL-COOH and DIDLHL-CONH2 aggregate to form spherical structures at pH 5 and 6. At pH 5, in the presence of mica, DIDLHL-CONH2 forms short fibrous structures. The presence of NaCl along with mica results in fibrillar structures. At pH 6, DIDLHL-CONH2 forms largely spherical aggregates. Both the peptides are unstructured in solution but adopt β-conformation on drying. The aggregates formed by DIDLHL-COOH and DIDLHL-CONH2 are formed during drying process and their structures are modulated by the presence of mica and salt. Our study suggests that a peptide need not have intrinsic amyloidogenic propensity to facilitate the self-assembly of the full-length protein. The propensity of peptides to form self-assembled structures that are non-amyloidogenic could be important in potentiating the self-assembly of full-length proteins into amyloid fibrils.
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Abbreviations
- AFM:
-
atomic force microscopy
- ATR:
-
attenuated total reflection
- CD:
-
circular dichroism
- D-ac:
-
NH2−DIDLHL−COOH
- D-am:
-
NH2−DIDLHL−CONH2
- FTIR:
-
Fourier transform infrared
- MALDI TOF:
-
matrix-assisted laser desorption ionization time-of-flight
- PI3-SH3:
-
phosphatidylinositol-3-kinase
- SH3:
-
Src homology 3
- SPC-SH3:
-
SH3 domain of chicken brain α-spectrin
- TFA:
-
trifluoroacetic acid
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This work was funded by CSIR under the Network Project NWP035.
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[Chaudhary N, Singh S and Nagaraj R 2011 Aggregation properties of a short peptide that mediates amyloid fibril formation in model proteins unrelated to disease. J. Biosci. 36 679–689] DOI 10.1007/s12038-011-9104-3
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Chaudhary, N., Singh, S. & Nagaraj, R. Aggregation properties of a short peptide that mediates amyloid fibril formation in model proteins unrelated to disease. J Biosci 36, 679–689 (2011). https://doi.org/10.1007/s12038-011-9104-3
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DOI: https://doi.org/10.1007/s12038-011-9104-3