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Triton X-100加KI对燕麦根细胞质膜ATP酶的溶解 被引量:2

Solubilization of the Plasma Membrane ATPase of Oat Roots by Triton X-100 and KI
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摘要 在酸性条件下,1% Triton X—100加 0.25mol/L KI能有效地溶解燕麦根细胞质膜ATP酶。溶解的ATP酶水解ATP的最适pH在6.5左右,酶活性受到Na_3VO_4和DES的强烈抑制,而不受Na_2MoO_4和NaN_3的抑制。溶解的酶液经透析后,K^+—ATP酶活性占Mg^(2+),KCl—ATP酶活性的85%。 The plasma membrane ATPase was succes-sfully solubilized with a two-step procedure. Asthe first step, the plasma membrane preparationwas washed with 0. 1% Triton X-100 and 0.2mol/L KC1. This removed approxima?ely 60%of the total proteins of the membrane prepara-tion giving about a 2-fold activity of K^+, Mg^(2+)-ATPase (Table 1). As the second step, TritonX-100 and KI were used to treat the washedplasma membranes, and produced an unexpec-ted result. Then the system of Triton X-100and KI of solubilization of the plasma mem-brane ATPase was studied in detail. The optimum condition of the solubiliza-tion of K^+, Mg^(2+)-ATPase was 1% Triton X-100and 0.25 mol/L KI at pH 4.5 (Fig. 1 and Fig.2). The low pH of the system may be importantin stabilizing the activity of tbe solubilized ATP-ase. The optimum pH of the solubilized ATPasewas about 6. 5 (Fig. 3). The activity of the enzyme was inhibited by Na_3VO_4. and DES, but notby NaN_3, and Na_2MoO_4. (Table 3). When thesolubilized ATPase was dialyed, higher Octivityof K^+-ATPase (312 units) was obtained, and thepercentage of the activity of K^+-APTase in thatof K^+,Mg^(2+)-ATPase was 85% (Table 4), whichis much higher than what others obtained (Hod-ges and Leonard 1974, Vara and Serrano1982). This result is important for further studyof the relationship between the plasma membr-ane ATPase and the transport of K^+ through theplasma membrane. Several other detergents were also testedin an attempt to solubilize the plasma mem-brane ATPase. But the results were not as goodas with Triton X-100 and KI (Table 2).
出处 《植物生理学报(0257-4829)》 CSCD 1989年第3期289-294,共6页 Acta Phytophysiologica Sinica
基金 中国科学院科学基金
关键词 燕麦 质膜 ATP酶 oat root plasma membrane ATPase Triton X-100 KI solubilization
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参考文献1

  • 1张--,科学通报,1988年,33卷,1101页

同被引文献17

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  • 2胡章立,李琳,荆家海,焦新之.水分胁迫对玉米幼叶生长区细胞质膜H^+-ATPase活性的影响[J].植物生理学报(0257-4829),1993,19(2):124-130. 被引量:35
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  • 4焦新之 余叔文.高等植物细胞膜的传递系统.植物生理与分子生物学[M].北京:科学出版社,1991.99-111.
  • 5简令成 孙龙华 等.小麦穗轴中ATP酶活性及物质运输通道的定位分布与小穗发育的关系[J].植物学报,1983,25(4):313-315.
  • 6简令成 董合铸 等.番茄子叶细胞内内三磷酸腺苷酶活性的超微结构定位及其在冷害中的变化[J].植物学报,1981,23(4):257-261.
  • 7冯秀香 倪晋山 等.不连续蔗糖梯度离心和两相分配法纯化的小麦细胞质膜的特性[J].科学通报,1988,(14):1101-1104.
  • 8焦新之 景国安 等.表面活性剂Tween-20对离体小麦根钾离子运转的影响[J].植物生理学报,1979,5(3):261-269.
  • 9候建华,华北农学报,1992年,7卷,4期,52页
  • 10焦新之,植物生理与分子生物学,1991年,99页

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