The Molecular Trigger for High-Speed Wing Beats in a Bee
The Molecular Trigger for High-Speed Wing Beats in a Bee
复制标题
DOI：
10.1126/science.1237266
复制
发表时间：
2013-09-13
期刊：
影响因子：
56.9
通讯作者：
Yagi, N.
中科院分区：
文献类型：
--
作者：
Iwamoto, H.;Yagi, N.
高阶昆虫的高频率翅膀拍打是由不断激活的飞行肌肉的自我持续振荡驱动的。然而，其潜在的机制是基于飞行肌肉的特定功能还是基于预先存在的收缩功能尚不清楚。在这里，我们记录了X射线衍射电影，在5000帧/秒的速度，同时从两个拮抗飞行肌肉的大黄蜂在翅膀跳动。在正确的时间触发每个翼拍中风发生的信号在两块肌肉中得到解决。这些信号可能反映了拉伸引起的肌球蛋白变形，这也会增强脊椎动物肌肉的力量。研究结果表明，昆虫使用一个完善的预先存在的力增强机制的高频翅膀拍，而不是开发一个新的机制。
The high-frequency wing beat of higher-order insects is driven by self-sustained oscillations of constantly activated flight muscles. However, whether its underlying mechanism is based on flight muscle-specific features or on preexisting contractile functions is unknown. Here, we recorded X-ray diffraction movies, at a rate of 5000 frames/second, simultaneously from the two antagonistic flight muscles of bumblebees during wing beat. Signals that occurred at the right timing for triggering each wing-beat stroke were resolved in both muscles. The signals likely reflect stretch-induced myosin deformation, which would also enhance force in vertebrate muscles. The results suggest that insects use a refined preexisting force-enhancing mechanism for high-frequency wing beat, rather than developing a novel mechanism.