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首页> 外文期刊>Journal of bacteriology >Synthesis and inactivation of carbamyl phosphate synthetase isozymes of Bacillus subtilis during growth and sporulation.
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Synthesis and inactivation of carbamyl phosphate synthetase isozymes of Bacillus subtilis during growth and sporulation.

机译：枯草芽孢杆菌在生长和孢子形成过程中氨基甲酰磷酸合成酶同工酶的合成和失活。

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摘要

Pyrimidine-repressible carbamyl phosphate synthetase P was synthesized in parallel with aspartate transcarbamylase during growth of Bacillus subtilis on glucose-nutrient broth. Both enzymes were inactivated at the end of exponential growth, but at different rates and by different mechanisms. Unlike the inactivation of aspartate transcarbamylase, the inactivation of carbamyl phosphate synthetase P was not interrupted by deprivation for oxygen or in a tricarboxylic acid cycle mutant. The arginine-repressible isozyme carbamyl phosphate synthetase A was synthesized in parallel with ornithine transcarbamylase during the stationary phase under these growth conditions. Again, both enzymes were subsequently inactivated, but at different rates and by apparently different mechanisms. The inactivation of carbamyl phosphate synthetase A was not affected in a protease-deficient mutatn the inactivation of ornithine transcarbamylase was greatly slowed.
机译：在葡萄糖营养肉汤中枯草芽孢杆菌的生长过程中，与天冬氨酸转氨酶平行地合成了嘧啶可抑制的氨基甲酸酯磷酸合成酶P。两种酶均在指数增长结束时失活，但速率和作用机理不同。与天冬氨酸转氨甲酰酶的失活不同，氨基甲酸酯磷酸合成酶P的失活不会因缺氧或在三羧酸循环突变体中而中断。在这些生长条件下，在固定相期间，与鸟氨酸转氨甲酰酶平行地合成了精氨酸可抑制的同工酶氨甲酰磷酸磷酸合成酶A。同样，两种酶随后都被灭活，但是以不同的速率和明显不同的机理被灭活。氨基甲酸酯磷酸合成酶A的失活在蛋白酶缺陷突变中不受影响，鸟氨酸转氨甲酰酶的失活大大减慢了。

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