Hydrolytic Cleavage of Thiamine in Mammalian Animals
نویسندگان
چکیده
منابع مشابه
Hydrolytic cleavage of DNA-model substrates promoted by polyoxovanadates.
Hydrolysis of 4-nitrophenyl phosphate (NPP) and bis-4-nitrophenyl phosphate (BNPP), two commonly used DNA model substrates, was examined in vanadate solutions by means of (1)H, (31)P and (51)V NMR spectroscopy. The hydrolysis of the phosphoester bond in NPP at 50 degrees C and pH 5.0 proceeds with a rate constant of 1.74 x 10(-5) s(-1). The cleavage of the phosphoester bond in BNPP at 70 degree...
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Genetic and biochemical studies have previously implicated exonuclease 1 (Exo1) in yeast and mammalian mismatch repair, with results suggesting that function of the protein in the reaction depends on both its hydrolytic activity and its ability to interact with other components of the repair system. However, recent analysis of an Exo1-E109K knockin mouse has concluded that Exo1 function in mamm...
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Pyrethroid chemicals are attractive alternatives to the organophosphates (OPs) because of their selective toxicity against pests rather than mammals. The carboxylesterases (CEs) are hepatic enzymes that metabolize ester-containing xenobiotics such as pyrethroids. The primary aim of this study was to gain insight into the catalytic properties of the CE enzymes in humans that metabolize pyrethroi...
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Although the reduced folate carrier RFC1 and the thiamine transporters THTR-1 and THTR-2 share approximately 40% of their identity in protein sequence, RFC1 does not transport thiamine and THTR-1 and THTR-2 do not transport folates. In the present study, we demonstrate that transport of thiamine monophosphate (TMP), an important thiamine metabolite present in plasma and cerebrospinal fluid, is ...
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Using the P4 unknotting assay, DNA topoisomerase I1 has been purified from several mammalian cells. Similar to prokaryotic DNA gyrase, mammalian DNA topoisomerase I1 can cleave double-stranded DNA and be trapped as a covalent protein-DNA complex. This cleavage reaction requires protein denaturant treatment of the topoisomerse 11-DNA complex and is reversible with respect to salt and temperature...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1966
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.14.1444