7-S-Glutathionyltryptophan-4,5-dione: Formation from 5-Hydroxytryptophan and Reactions with Glutathione
摘要:
The electrochemically driven oxidation of 5-hydroxytryptophan (5-HTPP) in the presence of free glutathione (GSH) yields 4-S-glutathionyl-5-hydroxytryptophan (5) and 7S-glutathionyltryptophan-4,5-dione (7). The latter glutathionyl conjugate is formed both by nucleophilic addition of GSH to tryptophan-4,5-dione (4), a normal product of the oxidation of 5-HTPP, and by oxidation of 5 in a reaction where the glutathionyl residue migrates from the C(4)- to the C(7)-position. In the presence of free GSH 7 reacts to give the 3,7- and 6,7-bi-S-glutathionyl conjugates of 4 and, as a result of intramolecular cyclization reactions, a number of glutathionyl conjugates of an unusual tricyclic pyrroloquinoline. It is speculated that one or more of these products might represent aberrant oxidative metabolites that have been detected in the cerebrospinal fluid of patients with Alzheimer's Disease. (C) 1996 Academic Press, Inc.
7-S-Glutathionyltryptophan-4,5-dione: Formation from 5-Hydroxytryptophan and Reactions with Glutathione
摘要:
The electrochemically driven oxidation of 5-hydroxytryptophan (5-HTPP) in the presence of free glutathione (GSH) yields 4-S-glutathionyl-5-hydroxytryptophan (5) and 7S-glutathionyltryptophan-4,5-dione (7). The latter glutathionyl conjugate is formed both by nucleophilic addition of GSH to tryptophan-4,5-dione (4), a normal product of the oxidation of 5-HTPP, and by oxidation of 5 in a reaction where the glutathionyl residue migrates from the C(4)- to the C(7)-position. In the presence of free GSH 7 reacts to give the 3,7- and 6,7-bi-S-glutathionyl conjugates of 4 and, as a result of intramolecular cyclization reactions, a number of glutathionyl conjugates of an unusual tricyclic pyrroloquinoline. It is speculated that one or more of these products might represent aberrant oxidative metabolites that have been detected in the cerebrospinal fluid of patients with Alzheimer's Disease. (C) 1996 Academic Press, Inc.
Selective incorporation of 5-hydroxytryptophan into proteins in mammalian cells
申请人:Zhang Zhiwen
公开号:US20050136513A1
公开(公告)日:2005-06-23
This invention provides methods and compositions for incorporation of an unnatural amino acid into a peptide using an orthogonal aminoacyl tRNA synthetase/tRNA pair. In particular, an orthogonal pair is provided to incorporate 5-hydroxy-L-tryptophan in a position encoded by an opal mutation.
Oxidation Chemistry of 5-[[3-(2-Amino-2-carboxyethyl)-5-hydroxy-1H-indol-4-yl]oxy]-[3-(2-amino-2-carboxyethyl)]-1H-indole: A Putative Aberrant Metabolite of 5-Hydroxytryptophan
作者:Z. Wu、X.M. Shen、G. Dryhurst
DOI:10.1006/bioo.1995.1018
日期:1995.9
Oxidative damage is known to occur in certain regions of the brain in a number of neurodegenerative disorders that include Alzheimer's Disease (AD) and transient cerebral ischemia and as a result of methamphetamine abuse. Furthermore, aberrant but unknown oxidized forms of 5-hydroxytryptophan (5-HTPP) and 5-hydroxytryptamine (5-HT) have been detected in the cerebrospinal fluid (CSF) of AD patients but not in that of age-matched controls. Accordingly, it is possible that aberrant oxidative metabolites of 5-HTPP and 5-HT might play roles in the neurodegenerative processes that occur in the AD brain and other neurodegenerative disorders. Previous studies have established that the title compound (1) is among the products of the electrochemically driven and various enzyme-mediated oxidations of 5-HTPP. This investigation has focused on both the electrochemical and peroxidase-mediated oxidations of 1 at physiological pH and has established that this dimer is significantly more easily oxidized than 5-HTPP from which it is derived. Under weakly oxidizing conditions 1 is oxidized via a putative carbocation intermediate to an equimolar mixture of 5-HTPP and tryptophan-4,5-dione (2). Under more strongly oxidizing conditions further oxidation of 5-HTPP gives a C(4)-centered carbocation intermediate that can react with the free hydroxyl residue of 1 to form a trimer, tetramer, and larger oligomers that are subsequently further oxidized ultimately to dione 2. When administered into the brains of mice, 1 is a remarkably lethal compound (LD(50) = 3.3 mu g) and evokes a hyperactivity syndrome. Analyses of the brains of mice during this behavioral response reveal that an acute dose of 1 evokes a significant decrease of norepinephrine (NE) levels. Only minor alterations in whole brain levels of DA and 5-HT occur but levels of 3,4-dihydroxyphenylacetic acid, homovanillic acid, and 5-hydroxyindole-3-acetic acid are significantly elevated. These results suggest that the hyperactivity syndrome evoked by 1 is related to the elevated release and turnover of NE, DA, and 5-HT. Based upon the results obtained and by comparison with other pharmacologic manipulations that evoke a similar hyperactivity syndrome in mice and rats it appears that 1 might be metabolized in vivo to metabolites that interact with certain 5-HT and perhaps other receptor subpopulations. (C) 1995 Academic Press, Inc.
SELECTIVE INCORPORATION OF 5-HYROXYTRYPOPHAN INTO PROTEINS IN MAMMALIAN CELLS
申请人:THE SCRIPPS RESEARCH INSTITUTE
公开号:EP1725251A2
公开(公告)日:2006-11-29
EP1725251A4
申请人:——
公开号:EP1725251A4
公开(公告)日:2009-07-01
Selective Incorporation of 5-hydroxytryptophan into Proteins in Mammalian Cells
申请人:Zhang Zhiwen
公开号:US20120282626A1
公开(公告)日:2012-11-08
This invention provides methods and compositions for incorporation of an unnatural amino acid into a peptide using an orthogonal aminoacyl tRNA synthetase/tRNA pair. In particular, an orthogonal pair is provided to incorporate 5-hydroxy-L-tryptophan in a position encoded by an opal mutation.