Selection of RNA-Cleaving TNA Enzymes for Cellular Mg2+ Imaging.
Chembiochem
; 24(4): e202200651, 2023 02 14.
Article
em En
| MEDLINE
| ID: mdl-36513605
ABSTRACT
Catalytic DNA-based fluorescent sensors have enabled cellular imaging of metal ions such as Mg2+ . However, natural DNA is prone to nuclease-mediated degradation. Here, we report the inâ
vitro selection of threose nucleic acid enzymes (TNAzymes) with RNA endonuclease activities. One such TNAzyme, T17-22, catalyzes a site-specific RNA cleavage reaction with a kcat of 0.017â
min-1 and KM of 675â
nM. A fluorescent sensor based on T17-22 responds to an increasing concentration of Mg2+ with a limit of detection at 0.35â
mM. This TNAzyme-based sensor also allows cellular imaging of Mg2+ . This work presents the first proof-of-concept demonstration of using a TNA catalyst in cellular metal ion imaging.
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Base de dados:
MEDLINE
Assunto principal:
RNA
/
DNA Catalítico
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article