ACID-BASE AND REDOX PROPERTIES OF BLEPHARISMIN PHOTORECEPTOR PIGMENTS - A PULSE-RADIOLYSIS AND FLASH-PHOTOLYSIS STUDY

被引：4
|
作者：
HEELIS, PF [1 ]
PARSONS, BJ [1 ]
GHETTI, F [1 ]
LENCI, F [1 ]
ROWLEYWILLIAMS, CA [1 ]
NAMAN, S [1 ]
NAVARATNAM, S [1 ]
机构：
[1] CNR, IST BIOFIS, I-56127 PISA, ITALY
来源：
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY | 1994年 / 24卷 / 01期
关键词：
BLEPHARISMIN; TRIPLET STATES; ONE-ELECTRON REDUCTION; ONE-ELECTRON OXIDATION;
D O I：
10.1016/1011-1344(94)07004-0
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Laser flash photolysis spectra of chromophore extracts from Blepharisma japonicum cells have been measured. The variation of the triplet state spectra with pH is reported and the related pK(a) values of 2-3 for deprotonation of the excited triplet state was determined. The anionic Blepharismin triplet state does not appear to readily undergo one-electron reduction by mild reducing agents, but undergoes oxidation by benzoquinone. Pulse radiolysis has been used to independently determine the spectra of the one-electron reduced and one-electron-oxidised forms of Blepharismin.
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页码：41 / 45
页数：5
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