Purification and Characterization of Protein Carboxyl O-Methyltransferase from Porcine Spleen

  • Yoon, Sung-Pil (Department of Genetic Engineering, College of Life Sdence and Natural Resources) ;
  • Son, Min-Sik (Department of Genetic Engineering, College of Life Sdence and Natural Resources) ;
  • Han, Jeung-Whan (Laboratory of Biochemistry, College of Pharmacy, Sung Kyun Kwan University) ;
  • Lee, Hyang-Woo (Laboratory of Biochemistry, College of Pharmacy, Sung Kyun Kwan University) ;
  • Hong, Sung-Youl (Department of Genetic Engineering, College of Life Science and Natural Resources)
  • Received : 1997.01.08
  • Published : 1997.11.30

Abstract

We purified a protein carboxyl O-methyltransferase (protein methylase II) from porcine spleen to homogeneity. The molecular weight of the porcine spleen protein methylase II (ps-PM II) was estimated to be 27,500 daltons on SDS-PAGE. Amino acid sequence of N-terminal 28 residues for ps-PM II was identified. Amino-terminal three amino acid residues of ps-PM II were deleted when compared to those of other protein carboxyl methytransferase. S-Adenosyl-L-homocysteine competitively inhibits ps-PM II with a K, value of $1.63{\times}10^{-7}M$. Myelin basic protein exhibited the highest methyl-accepting capacity among the proteins tested.

Keywords