MetJ调节子的扰动影响了2-氨基丙烯酸酯胁迫在……中的后果。 (你提供的原文句子不完整,缺少具体受影响的对象)
Perturbation of the MetJ regulon impacts the consequences of 2-aminoacrylate stress in .
作者信息
Sawyer Bryce R, Shen Wangchen, Downs Diana M
机构信息
Department of Microbiology, University of Georgia, Athens, GA 30602-2605, USA.
出版信息
Microbiology (Reading). 2025 Jun;171(6). doi: 10.1099/mic.0.001572.
In the absence of the broadly conserved deaminase RidA (Reactive intermediate deaminase A), and other organisms accumulate the reactive enamine species 2-aminoacrylate (2AA). Free 2AA, generated from serine by the serine/threonine dehydratase IlvA, reacts with and covalently inactivates a subset of pyridoxal 5'-phosphate-dependent enzymes. The metabolic stress caused by 2AA generates growth defects in , including (i) when l-alanine is used as a nitrogen source, (ii) when pyruvate is used as a carbon source or (iii) in the presence of exogenous serine. Although the enzymatic targets of 2AA are consistent between growth conditions, the consequences of 2AA-dependent damage differ depending on the distribution of metabolic flux required in different conditions. Analysing the suppressors of a mutant has furthered our understanding of the RidA stress paradigm and, more generally, how a metabolic network responds to perturbation. Many such suppressors modulate the metabolic network to eliminate 2AA production by IlvA. Here, we describe that eliminating the MetJ transcriptional repressor allows a mutant to grow in the presence of 2AA stress in each of the three conditions. The mechanisms by which a Δ suppresses a mutant are nuanced and medium-dependent, emphasizing that consequences of 2AA stress differ based on environmental and metabolic context.
在缺乏广泛保守的脱氨酶RidA(反应性中间物脱氨酶A)的情况下,其他生物体积累反应性烯胺物质2-氨基丙烯酸酯(2AA)。由丝氨酸/苏氨酸脱水酶IlvA从丝氨酸产生的游离2AA与一部分磷酸吡哆醛依赖性酶发生反应并使其共价失活。2AA引起的代谢应激在[具体生物名称未给出]中产生生长缺陷,包括:(i)当L-丙氨酸用作氮源时;(ii)当丙酮酸用作碳源时;或(iii)在外源丝氨酸存在的情况下。尽管2AA的酶作用靶点在不同生长条件下是一致的,但2AA依赖性损伤的后果因不同条件下所需代谢通量的分布而异。分析[具体生物名称未给出]突变体的抑制子进一步加深了我们对RidA应激模式的理解,更普遍地说,加深了对代谢网络如何响应扰动的理解。许多这样的抑制子调节代谢网络以消除IlvA产生的2AA。在这里,我们描述了消除MetJ转录阻遏物可使[具体生物名称未给出]突变体在三种条件中的每一种条件下的2AA应激存在时生长。Δ[具体基因缺失情况未给出]抑制[具体生物名称未给出]突变体的机制是细微且依赖培养基的,强调2AA应激的后果因环境和代谢背景而异。