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首页> 外文期刊>Biochimica et biophysica acta: BBA: International journal of biochemistry, biophysics and molecular biololgy. Proteins and Proteomics >In vitro studies of disease-linked variants of human tRNA nucleotidyltransferase reveal decreased thermal stability and altered catalytic activity
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In vitro studies of disease-linked variants of human tRNA nucleotidyltransferase reveal decreased thermal stability and altered catalytic activity

机译:体外研究人TRNA核苷酸转移酶的疾病连接变体揭示了热稳定性降低和改变的催化活性

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摘要

Mutations in the human TRNT1 gene encoding tRNA nucleotidyltransferase (tRNA-NT), an essential enzyme responsible for addition of the CCA (cytidine-cytidine-adenosine) sequence to the 3'-termini of tRNAs, have been linked to disease phenotypes including congenital sideroblastic anemia with B-cell immunodeficiency, periodic fevers and developmental delay (SIFD) or retinitis pigmentosa with erythrocyte microcytosis. The effects of these disease-linked mutations on the structure and function of tRNA-NT have not been explored. Here we use biochemical and biophysical approaches to study how five SIFD-linked amino acid substitutions (T154I, M158V, L166S, R190I and I223T), residing in the N-terminal head and neck domains of the enzyme, affect the structure and activity of human tRNA-NT in vitro. Our data suggest that the SIFD phenotype is linked to poor stability of the T154I and L166S variant proteins, and to a combination of reduced stability and altered catalytic efficiency in the M158 V, R190I and I223T variants.
机译:编码TRNA核苷酰亚胺转移酶(TRNA-NT)的人TRNT1基因的突变,对TRNA的3'-末端添加CCA(胞嘧啶 - 胞嘧啶 - 腺苷)序列的基本酶已与疾病表型相关联,包括先天性纵向囊肿具有B细胞免疫缺陷的贫血,周期性的FeVER和发育延迟(SIFD)或具有红细胞微肾病的视网膜炎。尚未探讨这些疾病连接突变对TRNA-NT的结构和功能的影响。在这里,我们使用生物化学和生物物理方法来研究五种均线连接的氨基酸取代(T154I,M158V,L166S,R190I和I223T),驻留在酶的N-末端头部和颈域中,影响人的结构和活性体外trna-nt。我们的数据表明,SIFD表型与T154I和L166S变体蛋白的稳定性差,以及在M158V,R190I和I223T变体中降低的稳定性和改变的催化效率的组合。

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