Abstract
A high-performance liquid chromatography (HPLC)-based fluorometric method for measuring serine hydroxymethyltransferase (SHMT) activity toward formation of serine and (6 S)-H 4PteGlu n has been developed. In this method, serine formed by SHMT activity is reacted with 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) to form the fluorescent adduct NBD–serine. The fluorescent assay components are then separated by reversed-phase chromatography, and NBD–serine is quantified by comparison with standards. This method was used to determine the K m and k cat values for 5,10-CH 2–H 4PteGlu 5 of an SHMT from Arabidopsis thaliana. These data represent the first determination of kinetic parameters for ( 6S)-5,10-CH 2–H 4PteGlu 5 for an SHMT from any organism.
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