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- W1481193685 abstract "A novel molecular species contributes about 5% of the total tryptophan synthetase of Escherichia coli derepressed for the trp operon enzymes. The new species is identified under conditions in which the dissociation of the two nonidentical subunits of the tryptophan synthetase complex is favored. The new species sediments at 5.7S, catalyzes the conversion of indole-3-glycerol phosphate to indole, and has been designated alpha(5.7-S). Although alpha(5.7-S) is not observed in extracts of trpA or trpB mutant strains deficient in the ability to form tryptophan synthetase alpha or beta2 subunits, respectively, a mixture of the two extracts allows the formation of alpha(5.7-S). Similar results are obtained when a homogeneous alpha protein is mixed with an extract of a trpA mutant strain, suggesting that the interaction of alpha and beta2 proteins is obligatory for alpha(5.7-S) formation. One can obtain a beta2 protein preparation that when mixed with a pure alpha protein gives no alpha(5.7-S). Therefore, the interaction of alpha and beta2 proteins alone is not sufficient for the formation of alpha(5.7-S). When a mixture of alpha and beta2 proteins devoid of alpha(5.7-S) is added to extracts of trp deletion mutants, the novel species can be reconstituted in vitro only when deletions are used that carry at least the operator-proximal part of the trpB gene. Therefore, it is concluded that the alpha(5.7-S) species of tryptophan synthetase results from the interaction of the alpha protein, the beta2 protein, and a third component, beta', specified by the deoxyribonucleic acid defined by the end points of two trp deletion mutants." @default.
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- W1481193685 date "1975-11-01" @default.
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- W1481193685 title "Tryptophan synthetase alpha(5.7-S): novel molecular species formed within Escherichia coli" @default.
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- W1481193685 doi "https://doi.org/10.1128/jb.124.2.800-809.1975" @default.
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