منابع مشابه
Crystal structure of β-benzyl dl-aspartate N-carboxyanhydride
In the title racemic compound, C12H11NO5 [systematic name: benzyl 2-(2,5-dioxooxazolidin-4-yl)acetate], the oxazolidine ring is planar, with an r.m.s. deviation of 0.03 Å. The benzyl ring is almost normal to the oxazolidine ring, making a dihedral angle of 80.11 (12)°. In the crystal, inversion dimers are formed between the l- and d-enanti-omers via pairs of N-H⋯O hydrogen bonds. This arrangeme...
متن کاملThe metabolism in vivo of dl-phenylalanine in thiamine deficiency.
It is well established that phenylalanine and tyrosine are incompletely metabolized in scorbutic guinea pigs (15-17) and by premature infants (9, 10). Closs and Fijlling (3) have reported that phenylpyruvic acid appeared in the urine of thia,mine-deficient rats when extra phenylalanine was fed. The evidence in support of the latter claim was not conclusive, but such a finding would not be incon...
متن کاملChiral discrimination in cyclodextrin complexes of amino acid derivatives: β-cyclodextrin/N-acetyl-L- phenylalanine andN-acetyl-D phenylalanine complexes
In a systematic study of molecular recognition of amino acid derivatives in solid-state β-cyclodextrin (β-CD) complexes, we have determined crystal structures for complexes of β-cyclodextrin/N-acetyl-L-phenylalanine at 298 and 20 K and for N-acetyl-D-phenylalanine at 298 K. The crystal structures for the N-acetyl-L-phenylalanine complex present disordered inclusion complexes for which the distr...
متن کاملThe hydrolysis of N-benzoyl-DL-tyrosylglycinamide, N-acetyl-L-tyrosylglycinamide, and N-acetyl-DL-tyrosylglycinamide by chymotrypsin.
Contrary to the report of Bergmann and Fruton (1) the L peptide present in aqueous solutions of N-benzoyl-DL-tyrosylglycinamide, prepared by two independent methods, is rapidly hydrolyzed by crystalline chymotrypsin. At 40” and pH 7.8 in a 0.00344 M solution’ of the DL mixture the L component is hydrolyzed as rapidly as in a 0.00172 M solution of the L peptide (Table I). Because of the relative...
متن کاملRegulation of N-.formyl-methionyl-leucyl-phenylalanine
Neutrophil responses to a-N-formyl-LMetL-Leu-L-Phe (IMLF) are modulated by inhibitors of surface membrane neutral endopeptidase (NEP), such as phosphoramidon (PPAD). Because receptor recycling is presumably required for a sustained cellular response, the effect of PPAD on receptor reexpression was examined. After down-regulation of surface fMLF receptors by IMLF, PPAD blocked the normal reexpre...
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ژورنال
عنوان ژورنال: Nature
سال: 1950
ISSN: 0028-0836,1476-4687
DOI: 10.1038/165152a0