Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, 04510 México City, Mexico.
J Bacteriol. 2010 Mar;192(6):1735-9. doi: 10.1128/JB.01401-09. Epub 2010 Jan 22.
The Arc two-component system, comprising the ArcB sensor kinase and the ArcA response regulator, modulates the expression of numerous genes in response to the respiratory conditions of growth. ArcB is a tripartite histidine kinase whose activity is regulated by the oxidation of two cytosol-located redox-active cysteine residues that participate in intermolecular disulfide bond formation. Here we show that ArcB autophosphorylates through an intramolecular reaction which diverges from the usually envisaged intermolecular autophosphorylation of homodimeric histidine kinases.
Arc 双组分系统由 ArcB 传感器激酶和 ArcA 响应调节剂组成,可调节许多基因的表达,以响应生长的呼吸条件。ArcB 是一种三分体组氨酸激酶,其活性受两个位于细胞质中的氧化还原活性半胱氨酸残基的氧化调节,这些残基参与分子间二硫键的形成。在这里,我们表明 ArcB 通过一种分子内反应进行自身磷酸化,该反应偏离了通常设想的同源二聚体组氨酸激酶的分子间自身磷酸化。