Phosphoglycerate kinase acts as a futile cycle at high temperature.

Phosphoglycerate kinase acts as a futile cycle at high temperature.
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磷酸甘油酸激酶在高温下充当无效循环。

DOI:
10.1099/mic.0.000542
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发表时间:
2017
期刊:
Microbiology (Reading, England)
影响因子:
--
通讯作者:
Kouril T
Kouril T
中科院分区:
--
文献类型:
--
作者:
Kouril T

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在(超级)嗜热生物中,新陈代谢过程必须适应,以在高温下以最佳方式运作。我们比较了在30 °C和70 °C下,1,3-二磷酸甘油酸酯通过1,3-二磷酸甘油酸酯转化为3-磷酸-甘油醛的情况。在30 °C下,3-磷酸甘油酸酯与磷酸甘油酸激酶可以合成1,3-二磷酸甘油酸酯,但在70 °C时,1,3-二磷酸甘油酸酯被快速脱磷为3-磷酸甘油酸酯,有效地将磷酸甘油酸激酶变成了一个无用的循环。当磷酸甘油酸激酶与3-磷酸甘油醛脱氢酶一起孵育时,在30 °C和70 °C下都可以将3-磷酸甘油醛转化为3-磷酸甘油醛,但在70 °C时,由于3-磷酸甘油醛的热不稳定,只能观察到低浓度的产物。因此,不耐热的中间体挑战中心代谢反应,需要特殊的适应策略来适应高温下的生命。
In (hyper)thermophilic organisms metabolic processes have to be adapted to function optimally at high temperature. We compared the gluconeogenic conversion of 3-phosphoglycerate via 1,3-bisphosphoglycerate to glyceraldehyde-3-phosphate at 30 °C and at 70 °C. At 30 °C it was possible to produce 1,3-bisphosphoglycerate from 3-phosphoglycerate with phosphoglycerate kinase, but at 70 °C, 1,3-bisphosphoglycerate was dephosphorylated rapidly to 3-phosphoglycerate, effectively turning the phosphoglycerate kinase into a futile cycle. When phosphoglycerate kinase was incubated together with glyceraldehyde 3-phosphate dehydrogenase it was possible to convert 3-phosphoglycerate to glyceraldehyde 3-phosphate, both at 30 °C and at 70 °C, however, at 70 °C only low concentrations of product were observed due to thermal instability of glyceraldehyde 3-phosphate. Thus, thermolabile intermediates challenge central metabolic reactions and require special adaptation strategies for life at high temperature.
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