Purification and Characterization of Thioredoxin f from Pea Leaves

  • Kang, Han-Chul (Department and Institute of Genetic Engineering, Kyunghee University) ;
  • Hahn, Tae-Ryong (Department and Institute of Genetic Engineering, Kyunghee University)
  • Received : 0
  • Accepted : 0
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Abstract

Thioredoxin f from pea leaves was purified to homogeneity and characterized. The purification steps involved ammonium sulfate fractionation, heat treatment, Sephadex G-75 and G-50 gel filtration, and hydroxyapatite and DEAE ion exchange chromatography. The monomeric molecular weight of purified pea thioredoxin f determined by SDS polyacrylamide gel electrophoresis was 12,000. The purified protein was active in the presence of reducing agents, such as dithiothreitol, at an alkaline pH (7.8~8.5). It was stable against heat such that more than 40% of its maximum activity remained after treatment at $90^{\circ}C$ for 10 min. Pea thioredoxin f was able to reduce insulin and was specific only to pea chloroplast fructose-1,6-bisphosphatase.

Keywords

Fructose-1,6-bisphosphatase;Pea thioredoxin f