Thioflavin S binds non-amyloid protein structures in lampbrush chromosomes of Gallus gallus domesticus
DOI:
https://doi.org/10.21638/spbu03.2022.106Abstract
Proteins that normally function in amyloid form are found in bacteria, yeast, plants and vertebrates, including humans. In particular, amyloid fibrils and amyloid-like structures are described in the germ cells of various organisms. Recently we showed that in chicken oocytes there are some nuclear structures that are stained by the amyloid-specific dye thioflavin S. Here we demonstrate that thioflavin S binds giant terminal RNP aggregates in chicken lampbrush chromosomes. However, these structures are not stained with Congo red and conformation-dependent anti-amyloid antibodies. Thus, thioflavin S stains chromosome-associated proteins that do not have amyloid properties. These data indicate that thioflavin S must be used with caution when identifying new functional and pathological amyloids.
Keywords:
amyloid, thioflavin S, Congo red, anti-amyloid antibodies, chicken, lampbrush chromosomes
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Articles of Biological Communications are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.