FORMATION OF 11-TRANS SLOW REACTING SUBSTANCES

被引:10
作者
ATRACHE, V [1 ]
SOK, DE [1 ]
PAI, JK [1 ]
SIH, CJ [1 ]
机构
[1] UNIV WISCONSIN, SCH PHARM, MADISON, WI 53706 USA
来源
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES | 1981年 / 78卷 / 03期
关键词
D O I
10.1073/pnas.78.3.1523
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Under strongly basic conditions [excess LiOH, dimethoxyethane/water (4:1, vol/vol)], purified slow reacting substances (SRS) SRS-GSH and SRS-Cys were not isomerized to their corresponding 11-trans isomers. Addition of thiols such as glutathione (GSH) or L-cysteine to this basic medium produced various amounts of 11-trans-SRS, depending on the thiol concentration. This chemical isomerization was inhibited by the radical scavenger 4-hydroxy-2,2,6,6-tetramethylpiperidinooxy free radical (HTMP); the inhibition suggests that the thiyl radical is added reversibly to the triene system at C-12, resulting in the overall cis .fwdarw. trans isomerization of the 11,12 double bond. Because the amount of 11-trans-SRS-Cys produced by intact RBL-1 cells apparently contain enzymes systems that form peroxides, which enhance the formation of thiyl radicals, required for cis .fwdarw. trans isomerization. HTMP inhibited the formation of 11-trans-SRS-Cys in this cell system.
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页码:1523 / 1526
页数:4
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