Quantitative nonradioactive CAT assays using fluorescent BODIPY 1-deoxychloramphenicol substrates.
Biotechniques
; 19(3): 488-93, 1995 Sep.
Article
en En
| MEDLINE
| ID: mdl-7495564
ABSTRACT
We report the development of fluorescent BODIPY 1-deoxychloramphenicol substrates for chloramphenicol acetyltransferase (CAT). These substrates not only simplify and improve quantitation of CAT activity but also extend the linear range of detection. Because the 1-deoxychloramphenicol derivatives have only one acetylation site, the enzyme reaction creates only one product, whereas chloramphenicol and its fluorescent derivatives produce three acetylated products, each of which accumulates at a different rate. Thus, 1-deoxychloramphenicol substrates eliminate the need to account for multiple products and provide a method in which product formation corresponds directly to enzyme activity. These nonradioactive substrates also allow researchers to streamline the standard thin-layer chromatography separation procedure visible results can be obtained within minutes and quantitative results in a few hours. The sensitivity of CAT assays using fluorescent 1-deoxychloramphenicol substrates is comparable to that achieved using [14C]chloramphenicol--between 10(-5) and 10(-6) units of activity in a 1-h reaction--and the linear range extends through 3.6 or more orders of magnitude. We expect that CAT assays employing BODIPY 1-deoxychloramphenicol CAT substrates will be a valuable improvement over other methods currently in use.
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Banco de datos:
MEDLINE
Asunto principal:
Compuestos de Boro
/
Cloranfenicol O-Acetiltransferasa
/
Cloranfenicol
/
Colorantes Fluorescentes
Idioma:
En
Año:
1995
Tipo del documento:
Article