Expression of sodium pump activities in BALB/c 3T3 cells transfected with cDNA encoding α3‐subunits of rat brain Na+,K+‐ATPase

Expression of sodium pump activities in BALB/c 3T3 cells transfected with cDNA encoding α3‐subunits of rat brain Na+,K+‐ATPase
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转染大鼠脑 Na+,K+-ATPase α3 亚基 cDNA 的 BALB/c 3T3 细胞中钠泵活性的表达

DOI:
10.1016/0014-5793(88)80218-7
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发表时间:
1988
期刊:
影响因子:
3.5
通讯作者:
M. Nakao
M. Nakao
中科院分区:
生物学3区
文献类型:
--
作者:
Y. Hara;Akira Nikamoto;T. Kojima;A. Matsumoto;M. Nakao

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通过共转染法将编码大鼠脑Na+,K +-ATP酶α 3-亚基的cDNA和新霉素抗性基因整合到BALB/c 3T3细胞中。用300 μ g/ml新霉素(G-418)选择稳定转化的细胞6周。以cDNA的3 ′-非翻译区为探针的北方印迹分析显示转染细胞中出现α 3 mRNA。转染细胞的Na+,K +-ATP酶活性是野生型细胞的两倍。关于哇巴因的敏感性,Na+,K +-ATP酶显示转染细胞中哇巴因的两个Ki值(8 × 10 − 8和4.5 × 10 − 5 M),而野生型细胞仅显示较高的值。Rb+摄取的哇巴因敏感性也证明了转染细胞中的两个Ki值(8 × 10 − 8和4.5 × 10 − 5 M)和野生型细胞中的4 × 10 − 5 M的aKi。α 3是Na+,K +-ATP酶对哇巴因高度敏感的催化亚基。也有人认为,哇巴因的敏感性完全由α亚基而不是β亚基的性质决定。本文首次报道了Na+,K +-ATP酶α 3亚型的催化特性。
The cDNAs encoding α3‐subunits of rat brain Na+,K+‐ATPase and the neomycin resistance gene were incorporated into BALB/c 3T3 cells by the co‐transfection method. Stably transformed cells were selected with 300 μg/ml of neomycin (G‐418) for 6 weeks. Northern blot analysis using the 3′‐non‐translated region of the cDNA as a probe revealed that the α3mRNA appeared in transfected cells. Na+,K+‐ATPase activity of the transfected cells was twice that of wild‐type cells. Regarding ouabain sensitivity, the Na+,K+‐ATPase showed twoKivalues for ouabain (8 × 10−8and 4.5 × 10−5M) in transfected cells while wild‐type cells displayed only the higher value. Ouabain sensitivity of Rb+uptake also demonstrated two Kivalues in the transfected cells (8 × 10−8and 4.5 × 10−5M) and aKiin wild‐type cells of 4 × 10−5M. It is concluded that α3is a highly ouabain‐sensitive catalytic subunit of Na+,K+‐ATPase. It is also suggested that ouabain sensitivity is exclusively determined by the properties of the α‐subunit rather than the β‐subunit. This is the first report on the catalytic charateristics of the α3isoform of Na+,K+‐ATPase.
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DOI: 10.1128/mcb.3.2.280-289.1983
发表时间: 1983
影响因子: 5.3
作者:
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DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
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DOI: --
发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1021/bi00373a001
发表时间: 1986-12-16
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
SHULL, GE;GREEB, J;LINGREL, JB
通讯作者: LINGREL, JB