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, mitochondria and peroxisomes. Homodimer. Colocalizes with peroxisome, cytoplasmic vesicles and/or organelles. IQ domain mediates interaction with calmodulin. The tail domain is a globular cargo-binding domain. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family. Plant myosin class XI subfamily.