Interactions Between Chromophore and Protein in Phytochrome Identified by Novel Oxa-, Thia- and Carba-Chromophores
作者:Christian Bongards、Wolfgang Gärtner
DOI:10.1111/j.1751-1097.2008.00319.x
日期:2008.9
Six new bilin chromophores of the plant photoreceptor phytochrome have been synthesized, carrying at the photoisomerizing ring D an oxygen or a sulfur atom or a methylene group instead of the pyrrole nitrogen atom. These furanone‐, thiophenone‐ or cyclopentenone‐containing compounds bound covalently to the recombinant apophytochrome phyA of Avena sativa. The novel chromoproteins showed hypsochromically
已经合成了植物光感受器光敏色素的六个新胆素发色团,在光异构化环 D 上带有氧或硫原子或亚甲基,而不是吡咯氮原子。这些含有呋喃酮、噻吩酮或环戊烯酮的化合物与燕麦重组色素phyA 共价结合。新型色蛋白显示出相对于天然光敏色素的低色移吸收光谱和强烈减弱的光化学活性,但荧光量子产率高出三到四倍。这些结果表明,一方面,环 D 修饰的发色团也可以被迫进入部分延伸的结构,这是掺入脱辅基蛋白结合口袋和共价结合所必需的。另一方面,