Journal
PRION
Volume 2, Issue 2, Pages 73-80Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/pri.2.2.7024
Keywords
RNA aptamer; prion protein; SELEX; GGA repeat; G-quadruplex
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Funding
- National Institute of Advanced Industrial Science and Technology
- Ministry of Agriculture, Forestry and Fisheries of Japan
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Iorder to obtain RNA aptamers against bovine prion protein (bPrP), we carried out in vitro selection from RNA pools containing a 55-nucleotide randomized region to target recombinant bPrP. Most of obtained aptamers contained conserved GGA tandem repeats (GGA) 4 and aptamer #1 (apt #1) showed a high affinity for both bPrP and its beta isoform (bPrP-beta). The sequence of apt #1 suggested that it would have a G-quadruplex structure, which was confirmed using CD spectra in titration with KCl. A mutagenic study of this conserved region, and competitive assays, showed that the conserved (GGA) 4 sequence is important for specific binding to bPrP and bPrP-beta. Following 5'-biotinylation, aptamer #1 specifically detected PrPc in bovine brain homogenate in a Northwestern blotting assay. Protein deletion mutant analysis showed that the bPrP aptamer binds within 25-131 of the bPrP sequence. Interestingly, the minimized aptamer #1 (17 nt) showed greater binding to bPrP and bPrP-beta as compared to apt #1. This minimized form of aptamer #1 may therefore be useful in the detection of bPrP, diagnosis of prion disease, enrichment of bPr and ultimately in gaining a better understanding of prion diseases.
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