Halide dependence of the halorhodopsin photocycle as measured by time-resolved infrared spectra.

Halide dependence of the halorhodopsin photocycle as measured by time-resolved infrared spectra.
复制标题

通过时间分辨红外光谱测量卤视紫红质光循环的卤化物依赖性。

DOI:
10.1016/s0006-3495(01)76117-6
复制
发表时间:
2001
影响因子:
3.4
通讯作者:
Braiman,MS
Braiman,MS
中科院分区:
生物学3区
文献类型:
--
作者:
Hutson,MS;Shilov,SV;Krebs,R;Braiman,MS

文献摘要

参考文献

被引文献

相似文献

在饱和浓度的氯化钾或溴化钾中,从3μS到100ms,采集了卤视紫质(HR)光循环的时间分辨傅里叶变换红外差谱。这些数据的动力学分析揭示了两个衰变过程,τ1≃15 0μS和τ2≃在任一卤化物存在下的时间常数分别为16ms,τ2描述了恢复到起始(HR)状态。与以前HR中间体的低温傅里叶变换红外光谱相比较,证实了特征HK和HL光谱特征在τ1衰变之前都存在,处于以前定义为hKL(Dioumaev,A.和M.Braiman)的状态。1997年。摄影。Photobiol.66:755-763)。然而,这些特征的相对大小取决于存在哪种卤化物。在BR−中,hl特征明显比在c1−中占优势。因此,τ1之前的状态可能最好描述为hKL/hL1平衡,而不是单个hKL状态。不同的卤化物对hKL1的相对含量有影响,即氯−对hL1到hKL的反作用比溴−明显得多。这种反反应的卤化物依赖性可以解释卤视紫红质阴离子泵的卤化物选择性。
Time-resolved Fourier transform infrared (FTIR) difference spectra of the halorhodopsin (hR) photocycle have been collected from 3μs to 100ms in saturating concentrations of KCl or KBr. Kinetic analysis of these data revealed two decay processes, with time constants ofτ1≃150μs andτ2≃16ms in the presence of either halide, withτ2describing the return to the starting (hR) state. Comparison to previous low-temperature FTIR spectra of hR intermediates confirms that characteristic hK and hL spectral features are both present before theτ1decay, in a state previously defined as hKL(Dioumaev, A., and M. Braiman. 1997.Photochem. Photobiol.66:755–763). However, the relative sizes of these features depend on which halide is present. In Br−, the hL features are clearly more dominant than in Cl−. Therefore, the state present beforeτ1is probably best described as an hKL/hL1equilibrium, instead of a single hKLstate. Different halides affect the relative amounts of hKLand hL1present, i.e., Cl−produces a much more significant back-reaction from hL1to hKLthan does Br−. The halide dependence of this back-reaction could therefore explain the halide selectivity of the halorhodopsin anion pump.
盐视紫红质光循环动力学、发色团结构和氯离子泵机制的共振拉曼研究。
DOI: 10.1021/bi00165a002
发表时间: 1992
期刊: Biochemistry
影响因子: 2.9
作者:
Ames,JB;Raap,J;Lugtenburg,J;Mathies,RA
通讯作者: Mathies,RA
DOI: 10.1016/s0301-4622(96)02268-5
发表时间: 1997-09-01
影响因子: 3.8
作者:
Dioumaev, AK
通讯作者: Dioumaev, AK
DOI: 10.1021/bi00044a027
发表时间: 1995-11
期刊: Biochemistry
影响因子: 2.9
作者:
G. Varo;L. Brown;J. Sasaki;H. Kandori;A. Maeda;R. Needleman;J. Lanyi
通讯作者: G. Varo;L. Brown;J. Sasaki;H. Kandori;A. Maeda;R. Needleman;J. Lanyi
来自盐盐杆菌的盐视紫红质的两种 L 光中间体的存在,其蛋白质和水 FTIR 谱带不同。
DOI: 10.1021/bi9903042
发表时间: 1999
期刊: Biochemistry
影响因子: 2.9
作者:
Y. Chon;H. Kandori;J. Sasaki;J. Lanyi;R. Needleman;A. Maeda
通讯作者: A. Maeda
DOI: 10.1016/s0006-3495(95)80385-1
发表时间: 1995-05
影响因子: 3.4
作者:
G. Varo;L. Zimányi;Xiaolei Fan;Li Sun;R. Needleman;J. Lanyi
通讯作者: G. Varo;L. Zimányi;Xiaolei Fan;Li Sun;R. Needleman;J. Lanyi