Amino acid sequences and ribosome-inactivating activities of karasurin-B and karasurin-C.
Complete amino acid sequences of karasurin-B and karasurin-C purified from root tubers of Trichosanthes kirilowii Maxim.var.japonica Kitamura (Cucurbitaceae) were determined. Karasurin-B consist of 247 amino acid residues with a calculated molecular weight of 27,214 Da and karasurin-C of 249 amino acid residues with a calculated molecular weight of 27,401 Da. Their amino acid sequences are quite similar to that of karasurin-A, a major basic protein from the same root tubers, but the pI values are slightly different among them. All karasurins strongly inhibited in vitro translation in the rabbit reticulocyte system. The amino acid sequences of karasurins were compared with those of the ribosome-inactivating proteins (RIPs) from nine different species by UPGMA method, and the RIPs fro Cucurbitaceae plants phylogenetically formed one cluster clearly distinguishable from those of other origin.
Kondo
T
T
Faculty of Pharmaceutical Sciences, Nagoya City University, Japan.
Mizukami
H
H
Takeda
T
T
Ogihara
Y
Y
D000020:Abortifacient Agents, Nonsteroidal / Q000737:chemistry*; D000595:Amino Acid Sequence; D000818:Animals; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D008969:Molecular Sequence Data; D009699:N-Glycosyl Hydrolases; D010940:Plant Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D011817:Rabbits; D012270:Ribosomes / Q000187:drug effects*
D000020:Abortifacient Agents, Nonsteroidal; D004365:Drugs, Chinese Herbal; D010940:Plant Proteins; C069870:karasurin protein, Trichosanthes kirilowii; D009699:N-Glycosyl Hydrolases