Use of Super-Resolution Live Cell Imaging to Distinguish Endoplasmic Reticulum: Nuclear Envelope Subcellular Localization.

Abstract

A distinguishing feature of eukaryotes is the presence of a nuclear envelope (NE) and endomembrane system. The NE is a double-membrane system that surrounds chromatin and is continuous with the endoplasmic reticulum (ER). This interface is crucial in various processes such as calcium signaling and ER-associated degradation. The outer nuclear membrane and ER share a multitude of proteins although some are only functional in one domain, whereas the inner nuclear membrane has its own unique proteome. Until recently, it was not possible to distinguish between the inner and outer nuclear membranes as well as perinuclear ER using light microscopy - only electron microscopy was suitable for this. Now, however, using super-resolution live cell imaging, this can be achieved while still observing protein and membrane dynamics in real time. The protocols described here will allow researchers to determine subcellular localization of potential NE/ER proteins in live plant cells, helping to gain new insights into protein functionality.