Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, 2629 HZ Delft, The Netherlands.
ACS Synth Biol. 2022 Oct 21;11(10):3120-3133. doi: 10.1021/acssynbio.2c00287. Epub 2022 Sep 27.
One of the major challenges of bottom-up synthetic biology is rebuilding a minimal cell division machinery. From a reconstitution perspective, the animal cell division apparatus is mechanically the simplest and therefore attractive to rebuild. An actin-based ring produces contractile force to constrict the membrane. By contrast, microbes and plant cells have a cell wall, so division requires concerted membrane constriction and cell wall synthesis. Furthermore, reconstitution of the actin division machinery helps in understanding the physical and molecular mechanisms of cytokinesis in animal cells and thus our own cells. In this review, we describe the state-of-the-art research on reconstitution of minimal actin-mediated cytokinetic machineries. Based on the conceptual requirements that we obtained from the physics of the shape changes involved in cell division, we propose two major routes for building a minimal actin apparatus capable of division. Importantly, we acknowledge both the passive and active roles that the confining lipid membrane can play in synthetic cytokinesis. We conclude this review by identifying the most pressing challenges for future reconstitution work, thereby laying out a roadmap for building a synthetic cell equipped with a minimal actin division machinery.
自下而上的合成生物学面临的主要挑战之一是重建最小的细胞分裂机制。从重建的角度来看,动物细胞分裂装置在机械上是最简单的,因此很有吸引力。一个基于肌动蛋白的环产生收缩力来收缩细胞膜。相比之下,微生物和植物细胞有细胞壁,因此分裂需要协调的膜收缩和细胞壁合成。此外,肌动蛋白分裂机制的重建有助于理解动物细胞和我们自己细胞的胞质分裂的物理和分子机制。在这篇综述中,我们描述了重建最小肌动蛋白介导的胞质分裂机制的最新研究进展。基于我们从细胞分裂中涉及的形状变化的物理学中获得的概念要求,我们提出了两种构建能够进行分裂的最小肌动蛋白装置的主要途径。重要的是,我们承认约束性脂质膜在合成胞质分裂中可以发挥的被动和主动作用。我们通过确定未来重建工作最紧迫的挑战来结束这篇综述,从而为构建配备最小肌动蛋白分裂机制的合成细胞制定了路线图。