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.
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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
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发表时间:
2001
影响因子:
3.4
通讯作者:
Braiman,MS
中科院分区:
文献类型:
--
作者:
Hutson,MS;Shilov,SV;Krebs,R;Braiman,MS
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.
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