Point mutations in Pma1 H+-ATPase of Saccharomyces cerevisiae: Influence on its expression and activity

Point mutations in Pma1 H+-ATPase of Saccharomyces cerevisiae: Influence on its expression and activity
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酿酒酵母Pma1 H-ATPase点突变对其表达和活性的影响

DOI:
10.1134/s000629791008016x
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发表时间:
2010
期刊:
Biochemistry (Moscow)
影响因子:
--
通讯作者:
V. Petrov
V. Petrov
中科院分区:
--
文献类型:
--
作者:
V. Petrov

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酵母Pma1 H+- atp酶是细胞代谢的关键酶,在质膜上产生电化学质子梯度,在维持细胞内离子稳态中起重要作用。使用定点诱变,我们之前用Ala替换了跨膜片段M8中的所有21个氨基酸残基(Guerra等人(2007)Biochim)。Biophys。学报,1768,2383-2392)。在这项工作中,我们提供了这些氨基酸残基在酶的结构-功能关系和细胞对热休克的耐受性中的作用的新数据。突变Q798A和I799A对细胞是致命的,无论酶在分泌囊泡或质膜中的表达如何。当F796A突变在分泌囊泡中表达时,会引起酶和细胞对热休克的敏感性。当酶在分泌囊泡或较小程度上在质膜中表达时,I794A突变增加了细胞的温度敏感性。E803A突变对ATPase和细胞对热休克的敏感性无显著影响;然而,它导致酶的E1和E2构象之间的平衡向E1转移。
Yeast Pma1 H+-ATPase is a key enzyme of cell metabolism generating electrochemical proton gradient across the plasma membrane, thus playing an important role in the maintenance of ion homeostasis in the cell. Using site-directed mutagenesis, we have previously replaced all 21 amino acid residues in the transmembrane segment M8 with Ala (Guerra et al. (2007) Biochim. Biophys. Acta, 1768, 2383–2392). In this work, we present new data on the role of these amino acid residues in the structure-function relationship in the enzyme and cell tolerance to heat shock. Mutations Q798A and I799A are lethal for cells regardless of expression of the enzyme in secretory vesicles or plasma membrane. The F796A mutation causes enzyme and cell sensitivity to heat shock when expressed in secretory vesicles. The I794A mutation increases temperature sensitivity of cells when the enzyme is expressed either in secretory vesicles or, to a lesser extent, in plasma membrane. The E803A mutation has no significant influence on the ATPase and cell sensitivity to heat shock; however, it causes a shift in the equilibrium between E1 and E2 conformations of the enzyme towards E1.
DOI: --
发表时间: 2000
期刊: The Journal of experimental biology
影响因子: --
作者:
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发表时间: 1995-12-05
期刊: BIOCHEMISTRY
影响因子: 2.9
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通讯作者: D. Perlin;S. Harris;D. Seto-Young;J. Haber
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发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Harris,SL;Perlin,DS;Seto-Young,D;Haber,JE
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