As a component of the LINC (LInker of Nucleoskeleton and Cytoskeleton) complex involved in the connection between the nuclear lamina and the cytoskeleton. The nucleocytoplasmic interactions established by the LINC complex play an important role in the transmission of mechanical forces across the nuclear envelope and in nuclear movement and positioning. Probable anchoring protein which tethers the nucleus to the cytoskeleton by binding PLEC which can associate with the intermediate filament system. Plays a role in the regulation of aortic epithelial cell morphology, and is required for flow-induced centrosome polarization and directional migration in aortic endothelial cells. Core component of LINC complexes which are composed of inner nuclear membrane SUN domain-containing proteins coupled to outer nuclear membrane KASH domain-containing nesprins. SUN and KASH domain-containing proteins seem to bind each other promiscuously; however, differentially expression of LINC complex constituents can give rise to specific assemblies. Interacts with SUN1 and SUN2; probably forming respective LINC complexes. Interacts with PLEC (via actin-binding domain). Interacts with DST. Interacts with SYNE1 via spectrin repeats. Interacts (via KASH domain) with TOR1A (ATP-bound); the interaction is required for SYNE3 nuclear envelope localization. Expressed in aortic endothelial cells (at protein level). The KASH domain is involved in the binding to SUN1 and SUN2 through recognition of their SUN domains. The disulfid bond with SUN1 or SUN2 is required for stability of the respective LINC complex under tensile forces. Belongs to the nesprin family. Truncated N-terminus. Truncated N-terminus. Extended N-terminus.