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1995 (1)
1993 (1)
1Author    EmanuelL. JohnsonRequires cookie*
 Title    Diurnal Fluctuations of Cocaine and Potential Precursors in Leaves of Erythroxylum coca  
 Abstract    In memory o f Prof. Dr. Cocaine is abundant in leaves o f Erythroxylum coca var. coca Lam. Consequently, cocaine and two o f its early biosynthetic precursors were monitored for 24 h to determine whether they fluctuated diurnally. E. coca was grown under controlled environmental conditions in a 
  Reference    Z. Naturforsch. 48c, 863—8 (1993); received June 22 1993 
  Published    1993 
  Keywords    Diurnal Fluctuation, Erythroxylum coca, Cocaine, Arginine, Phenylalanine 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0863.pdf 
 Identifier    ZNC-1993-48c-0863 
 Volume    48 
2Author    KenjiM. Atsui, H. Iroyuki, S. Hinta, T. Adahiko, K. Ajiwara, A. Kikazu, H. Atan AkRequires cookie*
 Title    Effect of Modification of Arginine Residues on the Activity of Soybean Lipoxygenase-1  
 Abstract    Arginine residues of soybean lipoxygenase-1 was modified with an arginine-directed chemical modifier, 2,3-butanedione. Although inactivation was not visible if the enzyme reac­ tion was monitored under the standard assay condition (83.3 |.im linoleic acid dispersed in 200 mM sodium borate, pH 9.0), rapid inactivation was observed with 5 mM sodium borate, pH 8.0. The inactivation was protected by the addition of a substrate, linoleic acid, in the modification mixture. Kinetic analyses indicated that one arginine residue accounted for the inactivation. Enzymological analyses showed that the modification narrowed the pH-activity profile of L-l and made L-l sensitive to salt concentration of the assay solution. Strong inactivation by modification was found at low salt concentration and low pH. This was not due to a physical change of the linoleic acid. On the other hand, product specificity of L-l was not altered after modification. Taken together, the modified arginine residue(s) was thought to be not essential to the catalysis but have an important role in supporting an ideal electrostatic interaction within L-l and/or between L-l and a substrate even in sub-optimal reaction conditions. 
  Reference    Z. Naturforsch. 50c, 37—4 (1995); received September 26/November 8 1994 
  Published    1995 
  Keywords    Arginine, 2, 3-Butanedione, Modification, Soybean Lipoxygenase-1 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0037.pdf 
 Identifier    ZNC-1995-50c-0037 
 Volume    50