Purification and characterization of coclaurine N-methyltransferase from cultured Coptis japonica cells
作者:Kum-Boo Choi、Takashi Morishige、Fumihiko Sato
DOI:10.1016/s0031-9422(00)00481-7
日期:2001.4
S-Adenosyl-L-methionine (SAM): coclaurine N-methyltransferase (CNMT), which catalyzes the transfer of a methyl group from S-adenosyl-L-methionine to the amino group of the tetrahydrobenzylisoquinoline alkaloid coclaurine. was purified 340-fold fromCoptisjaponicacells in 1% yield to give an almost homogeneous protein. The purified enzyme, which occurred as a homotetramer with a native Mr of 160 kDa
laboratory integrating organic synthesis, separation and time‐resolved fluorescence detection on a single microchip. The feasibility of our integrated laboratory is demonstrated by monitoring the formation of tetrahydroisoquinoline derivatives by Pictet–Spenglercondensation. After on‐chip reaction the products and residual starting material were separated enantioselectively on the same chip. On‐chip deep
Salsolinol and its N- and N,N-geranylated derivatives were tested for antimicrobial, cytotoxic, anti-oxidant, and anti-HIV activities, as well as inhibitory activity against Epstein-Barr virus early antigen (EBV-EA) activation induced by 12-0-tetradecanoylphorbol-13-acetate (TPA) in Raji cells. N,N-Geranylation increased potency in three different assays, antimicrobial, cytotoxic, and EBV-EA, while N-geranylation increased potency to a lesser extent in these same assays. N,N-Geranylated salsolinol was significantly active in all assays, except anti-HIV, and may be useful as a lead compound for developing potential chemotherapeutic agents.
Schoepf; Bayerle, Justus Liebigs Annalen der Chemie, 1934, vol. 513, p. 190,193,200