ChemInform Abstract: Studies on Physiologically Active Substrates in Citrus Fruit Peel. Part 23. Isolation and Characterization of New Limonoid Glycosides (I) and (II) from Citrus unshiu Peels.

ChemInform ◽  
2010 ◽  
Vol 30 (36) ◽  
pp. no-no
Author(s):  
Akiyoshi Sawabe ◽  
Masanori Morita ◽  
Tatsuya Kiso ◽  
Hideki Kishine ◽  
Yoshikazu Ohtsubo ◽  
...  
2012 ◽  
Vol 145 ◽  
pp. 102-108 ◽  
Author(s):  
Takehiko Shimada ◽  
Tomoko Endo ◽  
Ana Rodríguez ◽  
Hiroshi Fujii ◽  
Michiharu Nakano ◽  
...  

1999 ◽  
Vol 315 (1-2) ◽  
pp. 142-147 ◽  
Author(s):  
Akiyoshi Sawabe ◽  
Masanori Morita ◽  
Tatsuya Kiso ◽  
Hideki Kishine ◽  
Yoshikazu Ohtsubo ◽  
...  

Plant Science ◽  
2005 ◽  
Vol 168 (4) ◽  
pp. 987-995 ◽  
Author(s):  
Takehiko Shimada ◽  
Tomoko Endo ◽  
Hiroshi Fujii ◽  
Masakazu Hara ◽  
Mitsuo Omura

2020 ◽  
Vol 71 (10) ◽  
pp. 3066-3079 ◽  
Author(s):  
Xiaojuan Liu ◽  
Chenning Zhao ◽  
Qin Gong ◽  
Yue Wang ◽  
Jinping Cao ◽  
...  

Abstract Polymethoxylated flavones (PMFs), which accumulate exclusively in fruit peel of citrus, play important physiological and pharmacological roles but the genetic basis for the methylation of flavonoids has not been fully elucidated in citrus. Here we characterize a caffeoyl-CoA O-methyltransferase-like enzyme, designated CrOMT1. The expression pattern of CrOMT1 was highly correlated with the concentration of the three major PMFs in two different citrus fruit tissues during fruit maturation. Exposure of fruit to UV-B radiation sharply increased the level of CrOMT1 transcripts and also led to the accumulation of three PMFs. The potential role of CrOMT1 was studied by testing the catalytic activity of recombinant CrOMT1 with numerous possible substrates in vitro. The enzyme could most efficiently methylate flavones with neighboring hydroxy moieties, with high catalytic efficiencies found with 6-OH- and 8-OH-containing compounds, preferences that correspond precisely with the essential methylation sites involved in the synthesis of the three naturally occurring PMFs in Citrus reticulata. This indicates that CrOMT1 is capable of in vitro methylation reactions required to synthesize PMFs in vivo. Furthermore, transient overexpression of CrOMT1 increased levels of the three major PMFs in fruit, indicating that CrOMT1 is likely to play an essential role in the biosynthesis of PMFs in citrus.


2005 ◽  
Vol 103 (2) ◽  
pp. 233-238 ◽  
Author(s):  
Takehiko Shimada ◽  
Toshiro Hirabayashi ◽  
Tomoko Endo ◽  
Hiroshi Fujii ◽  
Masayuki Kita ◽  
...  

2000 ◽  
Vol 31 (2) ◽  
pp. 149-149 ◽  
Author(s):  
T Tozaki ◽  
H Kakoi ◽  
S Mashima ◽  
K Hirota ◽  
T Hasegawa ◽  
...  

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