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Biosci Trends:His标签和点突变对鸢尾素对MC3T3-E1细胞活性的影响

2019-01-25 MedSci MedSci原创

Irisin是由含有纤连蛋白III型结构域的蛋白质5(FNDC5)的裂解分泌的肌细胞因子,并且对骨形成具有影响。关于鸢尾素及其功能单元的结构的研究很有限。为了阐明负责鸢尾素作用的候选结构域,我们构建了几种鸢尾素变体,并测试了它们对MC3T3-E1细胞增殖和成骨的影响。一方面,将His标签添加到鸢尾素的N末端或C末端。另一方面,选择柔性区域或盐桥位点作为点突变的候选者。选择碱性磷酸酶(ALP),Ru

Irisin是由含有纤连蛋白III型结构域的蛋白质5(FNDC5)的裂解分泌的肌细胞因子,并且对骨形成具有影响。关于鸢尾素及其功能单元的结构的研究很有限。为了阐明负责鸢尾素作用的候选结构域,我们构建了几种鸢尾素变体,并测试了它们对MC3T3-E1细胞增殖和成骨的影响。

一方面,将His标签添加到鸢尾素的N末端或C末端。另一方面,选择柔性区域或盐桥位点作为点突变的候选者。选择碱性磷酸酶(ALP),Runt相关转录因子2(Runx2)和I型胶原蛋白α1(COL1α1)来测试分化效率。

我们在柔性区域Glu-57和Ile-107上发现了点突变,并且在虹膜蛋白的C末端添加His-tag确实影响了它的作用。虹膜素E57K,irisin I107F和irisinC-His的成骨潜能分别降低了重组-鸢尾素(r-鸢尾素)活性的约90.1%,88.8%和96.6%(P <0.05)。盐桥上的点突变Arg-75部分降低了鸢尾素的作用(r-鸢尾素的45±11.3%)(P <0.05)。 N-末端His-标签显示几乎没有效果(r-鸢尾素的93.5±25.7%)(P = 0.658)。

该研究表明,残基55-58和106-108的柔性区域和鸢尾素的C-末端对其活性是至关重要的。破坏鸢尾素的二聚化可能导致对细胞分化的部分减少的影响。

原始出处:

Zeng R, Ma Y, et al., The effect of His-tag and point mutation on the activity of irisin on MC3T3-E1 cells. Biosci Trends. 2018;12(6):580-586. doi: 10.5582/bst.2018.01207.

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    2019-08-03 yuanming17
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    2019-09-08 sunylz
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    2019-04-21 freve
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