Myosin heavy chain that is required for the cell cycle-regulated transport of various organelles and proteins for their segregation. Functions by binding with its tail domain to receptor proteins on organelles and exerting force with its N-terminal motor domain against actin filaments, thereby transporting its cargo along polarized actin cables. Involved in trafficking of Golgi stacks and mitochondria. Plays a role in nuclear shape determination. Drives nuclear movement along actin filaments (PubMed:23973298). As component of the SUN-WIP-WIT2-KAKU1 complex, mediates the transfer of cytoplasmic forces to the nuclear envelope (NE), leading to nuclear shape changes (PubMed:25759303). Homodimer (By similarity). Interacts with MYOB1 and MYOB7 (PubMed:23995081). Interacts with WIT1 and WIT2 (PubMed:23973298, PubMed:25759303). Core component of the LINC complex which is composed of inner nuclear membrane SUN domain-containing proteins coupled to outer nuclear membrane WIP and WIT proteins. The LINC complex also involves nucleoskeletal proteins CRWN/LINC and possibly KAKU4 and the cytoskeletal myosin KAKU1 (PubMed:25759303). Colocalizes with peroxisome, cytoplasmic vesicles and/or organelles. Nucleus membrane localization is dependent of the WIT2 association. A number of isoforms are produced. According to EST sequences. IQ domain mediates interaction with calmodulin. The tail domain is a globular cargo-binding domain. Impaired nuclear movement. Abnormal nucleus shape with invaginated envelope. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family. Plant myosin class XI subfamily.