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首页> 外文期刊>Journal of bacteriology >Histidine-Mediated Control of Tryptophan Biosynthetic Enzymes in Neurospora crassa
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Histidine-Mediated Control of Tryptophan Biosynthetic Enzymes in Neurospora crassa

机译：组氨酸介导的神经孢粉中色氨酸生物合成酶的控制。

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摘要

The formation of the five tryptophan biosynthetic enzymes of Neurospora crassa was shown to be derepressed in histidine-starved cells. This histidine-mediated derepression was not due to a lowered intracellular concentration of tryptophan in these cells. Furthermore, histidine-mediated derepression of tryptophan enzymes was found to be coordinate and not subject to reversal by tryptophan of either exogenous or biosynthetic origin. The synthesis of tryptophan enzymes also was found to be coordinate in cells which were not histidine-starved. Although histidine is clearly involved in regulating the synthesis of tryptophan enzymes, it did not prevent either tryptophan-mediated derepression of tryptophan enzymes or indole-3-glycerol phosphate-mediated derepression of tryptophan synthetase.
机译：结果表明，在组氨酸饥饿的细胞中， Neurospora crassa 的五个色氨酸生物合成酶的形成被抑制。这种组氨酸介导的抑制作用不是由于这些细胞中色氨酸的细胞内浓度降低所致。此外，发现组氨酸介导的色氨酸酶的阻遏是协调的，并且不受外源或生物合成来源的色氨酸的逆转。还发现色氨酸酶的合成在没有组氨酸饥饿的细胞中是协调的。尽管组氨酸明显参与调节色氨酸酶的合成，但它既不能阻止色氨酸介导的色氨酸酶抑制，也不能阻止吲哚-3-甘油磷酸酯介导的色氨酸合成酶抑制。

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