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'Phenylalanine' in keywords
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1993 (1)
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1Author    Z. Schweiz, NaturforschRequires cookie*
 Title    Biosynthesis of Cytochalasans. XI. New Results on the Incorporation of Phenylalanine into Cytochalasin D by Zygosporium masonii [1]  
 Abstract    Incorporation of L-[2-:H]phenyl-[2-:H]alanine and L-phenyl-[2-l3C, l:,N]alanine into cytochala­ sin D by Zygosporium masonii involved the complete loss of both the a -;H-and the a-'^N-atom. Incorporation of a mixture of L-phenyl-[l;>N]alanine and L-[U-l4C]phenylalanine into cytochalasin D and protein amino acids (phenylalanine, leucine, isoleucine) was accompanied by a substantial loss of 15N with respect to 14C. These effects are attributed to rapid exchange reactions taking place while L-phenylalanine is part of the intracellular pool of amino acids. In addition, the medium-and concentration-dependent incorporation of the carbon skeleton of exogeneous D-phenylalanine into cytochalasin D is reported. In a peptone-based complex medium, D-phenyl-alanine is poorly incorporated. Throughout the whole concentration range (0 —250 mg/1), the incorporation rates are less than 10% of those of L-phenylalanine. In a minimal medium contain­ ing NH 4 NO3 as nitrogen source however, D-phenylalanine is preferred over the natural enantiomer by a factor of 1.28 up to 6.78, depending on the concentrations of exogeneous d -and L-phenylalanine. These effects are attributed to the medium-dependent activities of different amino acid transport systems responsible for the uptake of d -and L-phenylalanine in Z. masonii. 
  Reference    Z. Naturforsch. 44c, 19 (1989); received September 7 1988 
  Published    1989 
  Keywords    Cytochalasans, Cytochalasin D, Biosynthesis, Phenylalanine, Zygosporium masonii 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0019.pdf 
 Identifier    ZNC-1989-44c-0019 
 Volume    44 
2Author    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 
3Author    Jochen Berhn, Brigitte VollmerRequires cookie*
 Title    Effects of a-Aminooxy-ß-phenylpropionic Acid on Phenylalanine Metabolism in /r-Fluorophenylalanine Sensitive and Resistant Tobacco Cells  
  Reference    Z. Naturforsch. 34c, 770 (1979); received May 18 1979 
  Published    1979 
  Keywords    Nicotiana tabacum, Suspension Cultures, a-A m inooxy-ß-phenylpropionic Acid, Chorismate Mu-tase, Phenylalanine, Pool Sizes 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0770.pdf 
 Identifier    ZNC-1979-34c-0770 
 Volume    34 
4Author    Jochen Berlin, BerndM. Artin, Jerzy Nowak, LudgerW. Itte+, Victor Wray, D. Ieter Strack+, G. Esellschaft Für, Biotechnologische Forschung, BhM. Ascheroder, W. EgRequires cookie*
 Title    Effects of Permeabilization on the Biotransformation of Phenylalanine by Immobilized Tobacco Cell Cultures  
 Abstract    Im m obilized tobacco cells excreted only a small proportion of their main secondary m etabolite caffeoylputrescine into the culture m edium . Experim ents designed to release more o f the com ­ pound by perm eabilization caused the loss o f caffeoylputrescine, probably by oxidative reactions. M oreover, rather mild treatments with pejm eabilizing agents (e.g. «-propanol) resulted in severe growth inhibition. The ability of perm eabilized cells to form caffeoylputrescine and other hy-droxycinnam oyl conjugates from phenylalanine decreased considerably even when such cells were still able to m etabolize phenylalanine into various ethyl acetate extractable com pounds (e.g. hydroxycinnamic acids and acetophenones). The formation of new biotransformation products suggests that perm eabilized cells could be used as a tool for testing the enzymatic capabilities o f a cell culture. 
  Reference    Z. Naturforsch. 44c, 249 (1989); received D ecem ber 5 1988 
  Published    1989 
  Keywords    Nicotiana tabacum, Cell Suspension Cultures, Imm obilized Cells, Permeabilized Cells, Biotrans­ form ation, Phenylalanine 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0249.pdf 
 Identifier    ZNC-1989-44c-0249 
 Volume    44