Zebrafish as a model for cardiac disease; Cryo-EM structure of native cardiac thin filaments from Danio Rerio.

Zebrafish as a model for cardiac disease; Cryo-EM structure of native cardiac thin filaments from Danio Rerio.
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DOI:
10.1007/s10974-023-09653-5
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发表时间:
2023-09
影响因子:
2.7
通讯作者:
--
中科院分区:
生物学3区
文献类型:
--
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肌动蛋白、原肌球蛋白和肌钙蛋白是构成心脏细丝收缩器的蛋白质,在物种间高度保守。我们用冷冻电镜研究了斑马鱼心脏细丝和肌动蛋白丝的三维结构。斑马鱼与人类70%的基因具有明显的同源性,且85%的致病基因保守,是研究人类疾病的良好动物模型。我们的斑马鱼细丝结构揭示了组成蛋白质之间的分子相互作用,表明复合物的基本组织与人类重建细丝中报道的相同。斑马鱼心脏F-肌动蛋白的重建表明,在14个肌动蛋白亚基的延伸长度上与人类心脏肌动蛋白没有偏差。将斑马鱼同源模型建模到我们的地图中,使我们能够详细比较与人类模型的相似性。特别是肌钙蛋白-T的结构相似性,一个已知包含肥厚型心肌病“热点”的区域,证实了斑马鱼研究这些致病突变的合适性。在线版本包含补充材料,可通过10.1007/s10974-023-09653-5获得。
Actin, tropomyosin and troponin, the proteins that comprise the contractile apparatus of the cardiac thin filament, are highly conserved across species. We have used cryo-EM to study the three-dimensional structure of the zebrafish cardiac thin and actin filaments. With 70% of human genes having an obvious zebrafish orthologue, and conservation of 85% of disease-causing genes, zebrafish are a good animal model for the study of human disease. Our structure of the zebrafish thin filament reveals the molecular interactions between the constituent proteins, showing that the fundamental organisation of the complex is the same as that reported in the human reconstituted thin filament. A reconstruction of zebrafish cardiac F-actin demonstrates no deviations from human cardiac actin over an extended length of 14 actin subunits. Modelling zebrafish homology models into our maps enabled us to compare, in detail, the similarity with human models. The structural similarities of troponin-T in particular, a region known to contain a hypertrophic cardiomyopathy ‘hotspot’, confirm the suitability of zebrafish to study these disease-causing mutations. The online version contains supplementary material available at 10.1007/s10974-023-09653-5.
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