SELECTIVE MODIFICATION OF POSITIVE CHEMOTAXIS IN THE TRUE SLIME-MOLD PHYSARUM-POLYCEPHALUM BY ETHYLENEDIAMINETETRAACETIC ACID TREATMENT

被引:1
作者
ISHIDA, N [1 ]
KURIHARA, K [1 ]
KOBATAKE, Y [1 ]
机构
[1] HOKKAIDO UNIV,FAC PHARMACEUT SCI,SAPPORO,HOKKAIDO 060,JAPAN
关键词
(Physarum polycephalum); Chemotaxis; Slime mold; Transduction mechanism;
D O I
10.1016/0304-4165(79)90223-X
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
The plasmodium of the true slime mold Physarum polycephalum was treated with EDTA or EGTA and the effect of the treatment on the chemotactic response was examined by measuring the chemotactic motive force with the double-chamber method. The results obtained were as follows: 1. (1) The treatment of the plasmodium with 5 mM EDTA (pH 7.0, 20 min) did not give any significant effect on the protoplasmic streaming or motility. 2. (2) The plasmodium treated with EDTA exhibited no chemotactic response to non-electrolyte attractants (D-glucose, D-galactose, D-mannose, and maltose) and negative chemotaxis to electrolyte attractants (cyclic AMP and NaH2PO4). 3. (3) The EDTA treatment gave no effect on the chemotactic response to repellents (D-fructose, NaCl, CaCl2, MgCl2). 4. (4) The EDTA-treated plasmodium exhibited changes in the membrane potential in response to both attractants and repellents as similar to the untreated plasmodium. 5. (5) The treatment of the plasmodium with 5 mM EGTA (pH 7.0, 20 min) gave results similar to those obtained with the EDTA treatment. The results obtained suggested that EDTA (or EGTA) treatment did not affect the receptor sites but modified the transduction mechanism from reception into tactic movement. © 1979.
引用
收藏
页码:89 / 98
页数:10
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