J. Biochem, 1989, Vol. 106, No. 1 60-65
© 1989 Japanese Biochemical Society
research-article |
Sensitization of Edman Amino Acid Derivatives Using the Fluorescent Reagent, 4-Aminofluorescein1
*Research Institute for Biosciences, Science University of Tokyo Noda, Chiba 278
**Department of Applied Biological Science, Science University of Tokyo Noda, Chiba 278
The ability to analyze amino acid derivatives at the femtomole level is one of the most interesting challenges in the field of protein microsequencing. 2-Anilino-5-thiazolinone amino acids, obtained by Edman degradation, were quantitatively derivatized with fluorescent primary amines. The most fluorescent reagent tested was 4-aminofluorescein. The amino acid derivatives sensitized with this reagent were separated using reversed-phase high-performance liquid chromatography and identified at the 100 attomole level. Incorporation of this method into the operation of a conventional automated sequencer is also described.
1This work was supported in part by a Grant-in-Aid from the Ministry of Education, Science and Culture of Japan. One of the authors (CSJ) was a recipient of a scholarship from the Ciba-Geigy Foundation.