ELEVATED LEVELS OF STRESS PROTEINS ASSOCIATED WITH BACTERIAL SYMBIOSIS IN AMOEBA-PROTEUS AND SOYBEAN ROOT NODULE CELLS

被引:21
作者
CHOI, EY [1 ]
AHN, GS [1 ]
JEON, KW [1 ]
机构
[1] UNIV TENNESSEE,DEPT ZOOL,KNOXVILLE,TN 37996
基金
美国国家科学基金会;
关键词
SYMBIOSIS; ENDOSYMBIONTS; HEAT-SHOCK PROTEINS; STRESS PROTEINS; MONOCLONAL ANTIBODIES;
D O I
10.1016/0303-2647(91)90006-7
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Obligatory bacterial endosymbionts of Amoeba proteus and symbiotic Bradyrhizobium japonicum bacteroids in soybean-root nodules contained large amounts of 67-kDa and 65-kDa proteins, respectively, antigenically related to groEL of E. coli and the 58-kDa heat-shock protein of Tetrahymena. Monoclonal antibodies against the 67-kDa protein recognized groEL analogs from several different organisms. The quantity of the stress protein in symbiotic B. japonicum bacteroids was augmented seven times that in the free-living counterparts. The increase in these proteins in endosymbionts, as determined by immunoblot techniques, indicated that intracellular symbiosis is a stress condition even when the symbiotic relationship is considered to be mutually beneficial. Mitochondria and chloroplasts may also be under a stressed condition like endosymbionts in view of the presence of heat-shock proteins in these cell organelles.
引用
收藏
页码:205 / 212
页数:8
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