Abstract
Accumulating evidence shows that some amyloidogenic proteins contain core sequences, which are critical for their fibrillization. Core sequences of α-synuclein, β-amyloid peptide and prion protein usually reside in their unfolded regions and share a conserved consensus (VGGAVVAGV) designated as GAV homologue. Here we investigate the role of unfolded regions in fibrillization after GAV homologue is attached to the C-terminus or inserted into the loop regions of different host proteins, namely α -Syn1-65, γ-synuclein, E. coli thioredoxin and immunoglobulin G binding B1 domain of streptococcal protein G. The results imply that an unstructured region is required by GAV homologue for the fibrillization of host proteins. A number of amyloidogenic proteins with core sequences located in unstructured regions are summarized and discussed in details. The finding may provide further insight into the elucidating of the molecular mechanism underlying the fibrillization of α-Syn, Aβ and PrP as well as other amyloidogenic proteins.
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Abbreviations
- Aβ:
-
β-amyloid peptide
- AD:
-
Alzheimer’s disease
- AFM:
-
atomic force microscopy
- Ala:
-
alanine
- CD:
-
circular dichroism
- FPLC:
-
fast protein liquid chromatography
- GdmCl:
-
guanidium chloride
- Gly:
-
glycine
- HD:
-
Huntington’s disease
- IAPP:
-
islet amyloid polypeptide
- NAC:
-
non-Aβ component
- OPMD:
-
oculopharyngeal muscular dystrophy
- PABP2:
-
poly(A) binding protein 2
- PBS:
-
phosphate-buffered saline
- PD:
-
Parkinson’s disease
- PGBD:
-
immunoglobulin G binding B1 protein of streptococcal protein G
- PrD:
-
prion diseases
- PrP:
-
prion protein
- SBMA:
-
spinal and bulbar muscular atrophy
- SCA3/MJD:
-
spino-cerebellar ataxia/Machado-Joseph disease
- SDS-PAGE:
-
sodium dodecyl sulfate polyacrylamide gel electrophoresis
- α-Syn:
-
human α-synuclein
- γ-Syn:
-
human γ-synuclein
- ThT:
-
thioflavin T
- TRX:
-
thioredoxin
- UV:
-
ultra-violet
- Val:
-
Valine
- WT:
-
wild type
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Ji, LN., Du, HN., Zhang, F. et al. An Unstructured Region is Required by GAV Homologue for the Fibrillization of Host Proteins. Protein J 24, 209–218 (2005). https://doi.org/10.1007/s10930-005-6713-4
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DOI: https://doi.org/10.1007/s10930-005-6713-4