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• W1543105845 endingPage "4066" @default.
• W1543105845 startingPage "4056" @default.
• W1543105845 abstract "All prokaryotic and eukaryotic thioredoxins contain a conserved tryptophan residue, exposed at the active site disulfide/dithiol. The role of this W31 in Escherichia coli thioredoxin (Trx) was studied by site-directed mutagenesis. Four mutant Trx with W31Y, W31F, W31H, and W31A replacements were characterized. Very low tryptophan fluorescence emission from the remaining W28 was observed in all mutant Trx; reduction resulted in large, but variable increases (up to 11-fold) of fluorescence, to levels higher than in native or denatured wild-type Trx, demonstrating a previously postulated change involving W28. All W31 mutant Trx were good substrates for E. coli thioredoxin reductase. Compared with wild type, the apparent Km values were increased less than 2-fold for the W31A, W31H, and W31F Trx and the W31Y Trx showed even slightly higher catalytic efficiency (kcat/Km value). Functions of reduced Trx with ribonucleotide reductase and in reduction of insulin disulfides were more strongly influenced by the W31 replacements, in particular at low pH for A and H residues. T7 DNA polymerase activity generated by T7 gene 5 protein and reduced Trx was lowered by large factors for W31Y, W31A, or W31H compared with W31F or the wild-type protein. The in vivo function of Trx was studied by using pUC118-trxA expression in an E. coli trxA- background. The trxA genes with W31Y and W31F substitutions restored, fully and partly, the methionine sulfoxide utilization of a trxA-, metE- test strain; W31A and W31H mutations resulted in no growth. Propagation of M13 was moderately impeded by W31Y and W31F or severely by W31A and W31H replacements. Growth of a phage T3/7 hybrid was possible only with the W31Y and W31F substitutions reflecting the in vitro results for T7 DNA polymerase." @default.
• W1543105845 created "2016-06-24" @default.
• W1543105845 creator A5079550858 @default.
• W1543105845 creator A5091566374 @default.
• W1543105845 date "1991-03-01" @default.
• W1543105845 modified "2023-10-01" @default.
• W1543105845 title "Substitution of the conserved tryptophan 31 in Escherichia coli thioredoxin by site-directed mutagenesis and structure-function analysis" @default.
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• W1543105845 doi "https://doi.org/10.1016/s0021-9258(20)64285-5" @default.
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• W1543105845 hasPublicationYear "1991" @default.
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