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中国科学院大学学报 ›› 2010, Vol. 27 ›› Issue (5): 632-637.DOI: 10.7523/j.issn.2095-6134.2010.5.008

• 论文 • 上一篇    下一篇

质子传递蛋白Bacteriorhodopsin 颜色调谐的机理

陈德亮, 赵谦, 韩睿   

  1. 中国科学院研究生院生命科学学院,北京 100049
  • 收稿日期:2010-01-21 修回日期:2010-04-13 发布日期:2010-09-15
  • 通讯作者: 陈德亮
  • 基金资助:

    中国科学院研究生院院长基金B(095102GN00)资助 

Mechanism of color tuning in proton transporter Bacteriorhodopsin

CHEN De-Liang, ZHAO Qian, HAN Rui   

  1. 1-oxyl-2,2,5,5,-tetramethylpyrroline-3-methyl
  • Received:2010-01-21 Revised:2010-04-13 Published:2010-09-15

摘要:

直接与视黄醛短程作用的氨基酸残基的突变是Bacteriorhodopsin中颜色调谐的主要原因.我们发现:将第78位Ile替换为非天然残基R1,产生显著的颜色调谐.但R1在Gln75,Asn76,Thr128,Lys129和Leu61的替换,均未产颜色调谐.Bacteriorhodopsin光循环中间体的衰减表征发现: R1的替换使M412的衰减寿命显著延长.晶体结构发现:R1不与视黄醛发生短程作用,但可能直接与膜表面的"三体水分子"作用,并借助长程的氢键网络与视黄醛活性中心发生联系.

关键词: 颜色调谐, 视黄醛, 质子传递, 光循环

Abstract:

The color tuning in Bacteriorhodopsin is mostly caused by mutated residues which directly interact with retinal. In the present study, we have found a significant color tuning at Ile78 substituted with a non-native residue R1. However, no color tuning at Gln75, Asn76, Thr128, Lys129, or Leu61 was observed. In Bacteriorhodopsin photocycle, the lifetime of M412 was significantly prolonged after the substitution. The structural analysis suggested that R1 might have a direct contact with the "water trimer" and interact with retinal through the long-distance hydrogen bonded network.

Key words: color tuning, retinal, proton transport, photocycle

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