Synthesis of tritium labeled [3R-3H]-, and [3S-3H]-L-phenylalanine
作者:J. Jemielity、R. Kanski、M. Kanska
DOI:10.1002/jlcr.461
日期:2001.3.30
The synthesis of two selectively labeled isotopomers of L-phenylalanine, (Phe), using chemical and enzymatic methods is reported. The [3R-3H]-L-Phe isotopomer has been obtained from [3-3H]cinnamic acid prepared from benzaldehyde and malonic acid using tritiated water as a source of radioactive label, and by addition of ammonia in the presence of enzyme PAL. The [3S-3H]-L-Phe isotopomer has been synthesized
报道了使用化学和酶促方法合成 L-苯丙氨酸 (Phe) 的两种选择性标记同位素。[3R-3H]-L-Phe 同位素是从苯甲醛和丙二酸制备的 [3-3H] 肉桂酸获得的,使用氚化水作为放射性标记源,并在酶 PAL 的存在下加入氨。[3S-3H]-L-Phe 同位素异构体是通过在含有 PAL 和氚化水的缓冲介质中将氨添加到肉桂酸中合成的。
Kinetic and solvent isotope effects on biotransformation of aromatic amino acids and their derivatives
Aromatic amino acids such as l-phenylalanine, l-tryptophan, 3',4'-dihydroxy-l-phenylalanine (l-DOPA), and their derivatives 3',4'-dihydroxyphenylacelaldehyde (DOPAL) and 3',4'-dihydroxyphenylethanol (DOPET), play an essential role in human metabolic processes. Incorrect or slow biotransformation of these compounds leads to some metabolic dysfunctions and in some cases to some neurodegenerative diseases
The synthesis of four selectively labeled isotopomers of L-tyrosine, (L-Tyr), using chemical and enzymatic methods is reported. Four tritium labeled isotopomers of L-phenylalanine (L-Phe) – [2-3H]-, [2′,6′-3H2]-, [3R-3H]- and [3S-3H]- have been synthesized using a combination of chemical and enzymatic methods. The labeled isotopomers of L-Phe have been converted into [2 -3H]-, [2′,6′-3H2]-, [3R-3H]-