Chromophore formation in DsRed occurs by a branched pathway.

Chromophore formation in DsRed occurs by a branched pathway.
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DOI:
10.1021/ja1030084
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发表时间:
2010-06-23
影响因子:
15
通讯作者:
Keenan, Robert J.
Keenan, Robert J.
中科院分区:
化学1区
文献类型:
--
作者:
Strack, Rita L.;Strongin, Daniel E.;Mets, Laurens;Glick, Benjamin S.;Keenan, Robert J.

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与GFP一样,荧光蛋白DsRed具有在折叠蛋白内自催化形成的发色团,但DsRed发色团形成的机制尚不清楚。有人提出,初始氧化产生绿色发色团,最终氧化产生红色发色团。然而,该模型不能充分解释为什么成熟的DsRed样品含有绿色和红色发色团的混合物。我们提出的证据表明,成熟途径DsRed分支的发色团形成的上游。在初始氧化步骤之后,形成红色发色团的酰基亚胺的最终氧化与脱水形成绿色发色团处于动力学竞争中。该方案解释了为什么绿色和红色发色团是成熟途径的替代终点。
Like GFP, the fluorescent protein DsRed has a chromophore that forms autocatalytically within the folded protein, but the mechanism of DsRed chromophore formation has been unclear. It was proposed that an initial oxidation generates a green chromophore, and that a final oxidation yields the red chromophore. However, this model does not adequately explain why a mature DsRed sample contains a mixture of green and red chromophores. We present evidence that the maturation pathway for DsRed branches upstream of chromophore formation. After an initial oxidation step, a final oxidation to form the acylimine of the red chromophore is in kinetic competition with a dehydration to form the green chromophore. This scheme explains why green and red chromophores are alternative endpoints of the maturation pathway.
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