6152-89-2Relevant academic research and scientific papers
Drought stress increases the production of 5-hydroxynorvaline in two C4 grasses
Carmo-Silva, Ana E.,Keys, Alfred J.,Beale, Michael H.,Ward, Jane L.,Baker, John M.,Hawkins, Nathaniel D.,Arrabaca, Maria Celeste,Parry, Martin A.J.
experimental part, p. 664 - 671 (2010/02/17)
Plants produce various compounds in response to water deficit. Here, the presence and identification of a drought-inducible non-protein amino acid in the leaves of two C4 grasses is first reported. The soluble amino acids extracted from the lea
Reactivite du nitrite de sodium. V. Action sur les amino-acides, peptides et proteines
Gouesnard, Jean-Paul
, p. 88 - 94 (2007/10/02)
The action of sodium nitrite on various amino-acids was re-examined in conditions approximating to a biological medium. 13C-NMR provides evidence of the existence of intramolecular ring closures and the formation of 5-membered rings with ornithine, citrulline and arginine.The reaction of cystine shows the opening of the sulphur bridges, whereas cysteine leads to the formation of carboxy-thiiran and 3-sulpho-lactic acid.The hydrolysis of the amide bonds of asparagine and glutamine is complete whereas the peptides studied - carnosine and aspartam - do not undergo hydrolysis of the peptide linkage.However, the first deamination of glutathion (γ-Glu-Cys-Gly) induces the peptide link to be broken and a cyclization with the formation of lactone to occur.A second deamination takes place on the cysteinyl residue released and allows the formation of a thiiran by intramolecular cyclization with the thiol group.The formation of thiiran was also observed with oxidized glutathion which has an S-S bridge.Finally, the formation of nitrosamines was detected by 15N-NMR during the reaction of sodium nitrite with two commercial products available to the general public.
