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cDNA cloning of turtle prion protein
1Istituto di Fisiologia Veterinaria e Biochimica, Università di Milano, Via Celoria 10, 20133, Milan, Italy. tatjana.simonic@unimi.it
FEBS Letters
|March 10, 2000
Summary
Researchers cloned the turtle prion protein (PrP), revealing conserved features with other species. Uniquely, turtle PrP possesses an EF-hand calcium-binding motif, offering new insights into prion protein evolution.
Area of Science:
- Biochemistry
- Molecular Biology
- Evolutionary Biology
Background:
- Prion proteins (PrP) are crucial in neurobiology.
- Understanding PrP diversity across species aids in elucidating function and evolution.
- The turtle PrP represents a phylogenetically distant PrP homolog.
Purpose of the Study:
- To report the cloning and characterization of the turtle prion protein (PrP).
- To compare turtle PrP structure and sequence with known mammalian and avian PrPs.
- To identify unique structural features of turtle PrP.
Main Methods:
- Complementary DNA (cDNA) cloning of the turtle PrP gene.
- Sequence analysis and comparison with other species' PrPs.
- Identification of conserved structural motifs and unique features.
Main Results:
- The cDNA coding for a 270-residue turtle PrP was successfully cloned.
- Turtle PrP shares approximately 40% identity with mammalian PrP and 58% with avian PrP.
- A unique EF-hand Ca(2+) binding motif was identified in the C-terminal region of turtle PrP.
- The coding region is a single exon, with a large intron in the 5' UTR.
Conclusions:
- The turtle PrP is the most evolutionarily distant PrP identified to date.
- Conserved structural elements suggest a shared ancestral function.
- The novel EF-hand motif in turtle PrP may indicate a unique calcium-binding role or regulatory mechanism.