Engineering the smallest transcription factor: accelerated evolution of a 63-amino acid peptide dual activator-repressor

Engineering the smallest transcription factor: accelerated evolution of a 63-amino acid peptide dual activator-repressor
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设计最小的转录因子:63 个氨基酸肽双激活子-阻遏物的加速进化

DOI:
10.1101/725739
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发表时间:
2019
期刊:
--
影响因子:
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通讯作者:
Brödel A
Brödel A
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作者:
Brödel A

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转录因子控制所有生命中的基因表达。这就提出了一个问题,即什么是能够支持这种活性的最小蛋白质。在自然界中,来自噬菌体λ的Cro是已知的最小的阻遏物(66个氨基酸; a.a.)但活化剂通常要大得多(例如λ cI,237 a.a.)。事实上,以前从Cro工程改造最小激活剂的努力在体内没有产生活性。在这项研究中,我们表明,定向进化的结果在一个新的Cro激活抑制因子,有效地发挥作用,λ cI,在体内。为了实现这一目标,我们开发了Phagemid辅助的持续进化:PACEmid。我们发现小至63-a.a.作为激活剂和/或阻遏物有效地起作用。据我们所知,这是迄今为止报道的最小的蛋白质基因调控因子,突出了转录因子从非常短的肽序列进化的能力。
Transcription factors control gene expression in all life. This raises the question of what is the smallest protein that can support such activity. In nature, Cro from bacteriophage λ is the smallest known repressor (66 amino acids; a.a.) but activators are typically much larger (e.g. λ cI, 237 a.a.). Indeed, previous efforts to engineer a minimal activator from Cro resulted in no activityin vivo. In this study, we show that directed evolution results in a new Cro activator-repressor that functions as efficiently as λ cI,in vivo. To achieve this, we develop Phagemid-Assisted Continuous Evolution: PACEmid. We find that a peptide as small as 63-a.a. functions efficiently as an activator and/or repressor. To our knowledge, this is the smallest protein gene regulator reported to date, highlighting the capacity of transcription factors to evolve from very short peptide sequences.
通过合成 cro 基因的工程诱变改变了 Cro 阻遏蛋白。
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