Component of SUN-protein-containing multivariate complexes also called LINC complexes which link the nucleoskeleton and cytoskeleton by providing versatile outer nuclear membrane attachment sites for cytoskeletal filaments (By similarity). Required for nucleus structure organization (e.g. size and shape) (PubMed:17873096, PubMed:24308514, PubMed:23396599). Core component of the LINC complex which is composed of inner nuclear membrane SUN domain-containing proteins coupled to outer nuclear membrane WIP proteins, the nucleoskeletal CRWN/LINC proteins, and, possibly, KAKU4. Recruited to the nucleus envelope (NE) by SUN proteins and is immobilised therein (By similarity). Mostly localized in the nucleoplasm and, to a lesser extent, at the nuclear periphery (PubMed:17873096). During prometaphase to anaphase, localized diffusely in the cytoplasm. A small population is later transferred from the cytoplasm to the chromatin surface. Relocalized to the nuclear periphery during late telophase (PubMed:23396599). Expressed at low levels in roots, leaves, flowers and flower stalks. Altered nuclear morphology. In plants lacking both CRWN1 and CRWN2, moderate dwarf and leaf-curling phenotype associated with endoreplication and strongly reduced nuclear size. Plants lacking both CRWN2 and CRWN4 exhibit slightly smaller rosettes. Plants lacking both CRWN1 and CRWN2 exhibit markedly smaller rosettes. Plants lacking CRWN1, CRWN2 and CRWN4 are extremely stunted and set few seed. Belongs to the CRWN family.