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弗里德里希共济失调中人类铁蛋白蛋白的遗传变异的计算机分析和结构建模。

An In Silico Analysis of Genetic Variants and Structural Modeling of the Human Frataxin Protein in Friedreich's Ataxia.

机构信息

Laboratory of Bioinformatics and Computational Biology, Federal University of the State of Rio de Janeiro (UNIRIO), Avenida Pasteur, 296, Urca, Rio de Janeiro 22290-250, Brazil.

Pharmaceutical Industrial Technology Laboratory, Federal University of Rio de Janeiro (UFRJ), Avenida Carlos Chagas Filho, 373, Cidade Universitária, Rio de Janeiro 21941-590, Brazil.

出版信息

Int J Mol Sci. 2024 May 26;25(11):5796. doi: 10.3390/ijms25115796.

Abstract

Friedreich's Ataxia (FRDA) stands out as the most prevalent form of hereditary ataxias, marked by progressive movement ataxia, loss of vibratory sensitivity, and skeletal deformities, severely affecting daily functioning. To date, the only medication available for treating FRDA is Omaveloxolone (Skyclarys), recently approved by the FDA. Missense mutations within the human frataxin (FXN) gene, responsible for intracellular iron homeostasis regulation, are linked to FRDA development. These mutations induce FXN dysfunction, fostering mitochondrial iron accumulation and heightened oxidative stress, ultimately triggering neuronal cell death pathways. This study amalgamated 226 FXN genetic variants from the literature and database searches, with only 18 previously characterized. Predictive analyses revealed a notable prevalence of detrimental and destabilizing predictions for FXN mutations, predominantly impacting conserved residues crucial for protein function. Additionally, an accurate, comprehensive three-dimensional model of human FXN was constructed, serving as the basis for generating genetic variants I154F and W155R. These variants, selected for their severe clinical implications, underwent molecular dynamics (MD) simulations, unveiling flexibility and essential dynamic alterations in their N-terminal segments, encompassing FXN42, FXN56, and FXN78 domains pivotal for protein maturation. Thus, our findings indicate potential interaction profile disturbances in the FXN42, FXN56, and FXN78 domains induced by I154F and W155R mutations, aligning with the existing literature.

摘要

弗里德里希共济失调症(FRDA)是最常见的遗传性共济失调症,其特征是进行性运动共济失调、振动觉丧失和骨骼畸形,严重影响日常生活功能。迄今为止,治疗 FRDA 的唯一药物是 Omaveloxolone(Skyclarys),最近获得了 FDA 的批准。导致 FRDA 发展的人类 frataxin(FXN)基因突变是错义突变,负责细胞内铁稳态调节。这些突变导致 FXN 功能障碍,促进线粒体铁积累和氧化应激增加,最终引发神经元细胞死亡途径。本研究综合了文献和数据库搜索中的 226 个 FXN 遗传变异体,其中只有 18 个以前有特征。预测分析显示,FXN 突变的有害和不稳定预测具有显著的普遍性,主要影响对蛋白质功能至关重要的保守残基。此外,还构建了一个准确、全面的人类 FXN 三维模型,作为生成遗传变异体 I154F 和 W155R 的基础。这些变异体因具有严重的临床意义而被选择,经过分子动力学(MD)模拟,揭示了其 N 端片段(包括 FXN42、FXN56 和 FXN78 结构域)的灵活性和关键的基本动力学改变,这些结构域对蛋白质成熟至关重要。因此,我们的研究结果表明,I154F 和 W155R 突变可能会干扰 FXN42、FXN56 和 FXN78 结构域的潜在相互作用谱,这与现有文献一致。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/cd1b/11172458/bc78b11b9119/ijms-25-05796-g001.jpg

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