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xiaoyue1199木虫 (著名写手)
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【分享】钱永健小组合成出红外线荧光蛋白
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Mammalian Expression of Infrared Fluorescent Proteins Engineered from a Bacterial Phytochrome Xiaokun Shu,1,2 Antoine Royant,3 Michael Z. Lin,2 Todd A. Aguilera,2 Varda Lev-Ram,2 Paul A. Steinbach,1,2 Roger Y. Tsien1,2,4,*  新红外线蛋白质的结构，小图是活体小鼠发出的红外线。 ABSTRACT:Visibly fluorescent proteins (FPs) from jellyfish and corals have revolutionized many areas of molecular and cell biology, but the use of FPs in intact animals, such as mice, has been handicapped by poor penetration of excitation light. We now show that a bacteriophytochrome from Deinococcus radiodurans, incorporating biliverdin as the chromophore, can be engineered into monomeric, infrared-fluorescent proteins (IFPs), with excitation and emission maxima of 684 and 708 nm, respectively; extinction coefficient >90,000 M–1 cm–1; and quantum yield of 0.07. IFPs express well in mammalian cells and mice and spontaneously incorporate biliverdin, which is ubiquitous as the initial intermediate in heme catabolism but has negligible fluorescence by itself. Because their wavelengths penetrate tissue well, IFPs are suitable for whole-body imaging. The IFPs developed here provide a scaffold for further engineering. 原文摘要部分报道： http://www.nature.com/nature/jou ... ll/nature07981.html |
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xiaoyue1199
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