Multicolor protein FRET with tryptophan, selective coumarin-cysteine labeling, and genetic acridonylalanine encoding.

Multicolor protein FRET with tryptophan, selective coumarin-cysteine labeling, and genetic acridonylalanine encoding.
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DOI:
10.1039/c7cc05492k
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发表时间:
2017-10-05
期刊:
Chemical communications (Cambridge, England)
影响因子:
--
通讯作者:
Petersson EJ
Petersson EJ
中科院分区:
其他
文献类型:
--
作者:
Ferrie JJ;Ieda N;Haney CM;Walters CR;Sungwienwong I;Yoon J;Petersson EJ

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位点特异性荧光探针可用于测量蛋白质内的距离,作为Förster共振能量转移(FRET)对的一部分。在这里,我们报告的合成香豆素马来酰亚胺(Mcm-Mal)是荧光与半胱氨酸反应后。我们证明,半胱氨酸,acridonylalanine(Acd)双突变蛋白可以产生非天然氨基酸诱变和反应与Mcm-Mal产生的Mcm/Acd标记的蛋白质的FRET研究。Mcm/Acd FRET对干扰最小,易于安装,非常适合研究15-40 nm范围内的蛋白质距离。此外,Mcm/Acd标记可以与色氨酸荧光在三色FRET中组合,以在一个实验中监测多种相互作用。
Site-specific fluorescence probes can be used to measure distances within proteins when used as part of a Förster resonance energy transfer (FRET) pair. Here we report the synthesis of a coumarin maleimide (Mcm-Mal) that is fluorogenic upon reaction with cysteine. We demonstrate that cysteine, acridonylalanine (Acd) double mutant proteins can be produced by unnatural amino acid mutagenesis and reacted with Mcm-Mal to generate Mcm/Acd labeled proteins for FRET studies. The Mcm/Acd FRET pair is minimally-perturbing, easy to install, and well-suited to studying protein distances in the 15-40 Å range. Furthermore, Mcm/Acd labeling can be combined with tryptophan fluorescence in three color FRET to monitor multiple interactions in one experiment.
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