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Two Distinct Isozymes of Repair Protein Carboxyl O-Methyltransferase from Porcine Brain
Hong,Sungyoul,Son,Youngjin,Moon,Hyung In,Son,Minsik,Lee,Hyang Woo,Han,Jeong-Whan,Park,Inho The Korea Science and Technology Center 1999 BMB Reports Vol.32 No.3
Protein carboxyl O-methyltransferase (PCMT) catalyzes the transfer of a methyl group from S-adenosyl-L-methionine to free carboxyl groups of methyl-accepting substrate proteins. Two isozymes were separated by DEAE-Sephacel chromatography from porcine brain cytosol and designated PCMT I and II. Isozymes I and II were further purified by adenosyl homocysteine-Sepharose 4B and Superose HR 12 chromatography. The molecular weights of the purified PCMT I and II were determined by mass spectrometry to be 20,138 Da AND 25,574 Da, respectively. The two enzymes displayed different isoelectric points; 7.9 for PCMT I and 5.3 for PCMT II. Isozymes I and II exhibited similar substrate specificities when tested with various methyl-accepting proteins. Myelin basic protein, a component of myelinated neurons, was found bo be an excellent methyl-accepting substrate for both PCMT isozymes with different Km values, 21.1 μM for PCMT I and 10.6μM for PCMT II. The PCMT activity and methyl-accepting capacity displayed similar distribution in the various brain regions with an exception of the lower values in the cerebellum. The overall distribution may relate to a general function of protein repair by PCMT in the brain.
Purification and Characterization of Protein Carboxyl O-Methyltransferase from Porcine Spleen
Hong,Sungyoul,Yoon,Sungpil,Son,Minsik,Han,Jeung-Whan,Lee,Hyang Woo The Korea Science and Technology Center 1997 BMB Reports Vol.30 No.6
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 1.63×10? M. Myelin basic protein exhibited the highest methyl-accepting capacity among the proteins tested.
Mn-doped ZnGeAs2 and ZnSnAs2 Single Crystals: Growth and Electrical and Magnetic Properties
Sungyoul Choi,최정용,John B. Ketterson,Soon Cheol Hong,Sunglae Cho,Yunki Kim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We have fabricated Mn-doped chalcopyrite ZnGeAs$_2$ and ZnSnAs$_2$ single crystals using vertical temperature gradient method. We have found out that Mn-doped ZnGeAs$_2$ and ZnSnAs$_2$ single crystals showed room-temperature ferromagnetism with Curie temperature of 333 and 329 K, respectively.