中国神经再生研究(英文版) ›› 2021, Vol. 16 ›› Issue (4): 700-706.doi: 10.4103/1673-5374.295332

• 原著:神经损伤修复保护与再生 • 上一篇    下一篇

轴突起始段蛋白-蛋白相互作用潜在影响动作电位的启动

  

  • 出版日期:2021-04-15 发布日期:2020-12-21

Modeling protein-protein interactions in axon initial segment to understand their potential impact on action potential initiation

Piyush Bhardwaj1, 2, Don Kulasiri1, 2, *, Sandhya Samarasinghe1    

  1. 1 Centre of Advanced Computational Solutions (C-fACS), Lincoln University, Christchurch, New Zealand;  2 Department of Molecular Biosciences, Lincoln University, Christchurch, New Zealand
  • Online:2021-04-15 Published:2020-12-21
  • Contact: Don Kulasiri, PhD, Don.Kulasiri@lincoln.ac.nz.

摘要:

存在高密度轴突起始段蛋白电压门控钠离子通道(Nav)的轴突起始段对于动作电位的启动至关重要。Nav通道包含几个丝氨酸残基,这些残基负责通过与锚蛋白G的相互作用将Nav通道聚积到轴突起始段的结构中。此次进行了一系列计算模拟研究,以了解轴突起始段蛋白酪蛋白激酶2和锚蛋白G在Nav聚积到轴突起始段中的作用。使用虚拟细胞软件的计算模拟结果表明,具有所有可用于磷酸化的丝氨酸位点的Nav通道以强亲和力与锚蛋白G结合。在较低的锚蛋白G和酪蛋白激酶2初始浓度下,Nav的浓度明显降低,这表明了酪蛋白激酶2和锚蛋白G在Nav通道聚积中的重要性。

https://orcid.org/0000-0001-8744-1578 (Don Kulasiri)

Abstract: The axon initial segment (AIS) region is crucial for action potential initiation due to the presence of high-density AIS protein voltage-gated sodium channels (Nav). Nav channels comprise several serine residues responsible for the recruitment of Nav channels into the structure of AIS through interactions with ankyrin-G (AnkG). In this study, a series of computational experiments are performed to understand the role of AIS proteins casein kinase 2 and AnkG on Nav channel recruitment into the AIS. The computational simulation results using Virtual cell software indicate that Nav channels with all serine sites available for phosphorylation bind to AnkG with strong affinity. At the low initial concentration of AnkG and casein kinase 2, the concentration of Nav channels reduces significantly, suggesting the importance of casein kinase 2 and AnkG in the recruitment of Nav channels. 

Key words: Alzheimer’s disease, ankyrin-G, axon initial segment, casein kinase-2, microtubules, voltage-gated potassium channel, voltage-gated sodium channel ,