Shell component of a type 1 encapsulin nanocompartment. Assembles into proteinaceous shells 21-24 nm in diameter. Empty organelles can be expressed in E.coli. Cargo proteins (DypB) are targeted to the interior via their C-terminal extensions. Stable as a monodisperse organelle up to 50 degrees Celsius, at higher temperatures they aggregate. Forms hollow shells composed of 60 subunits (Probable). Monomers probably form pentamers which assemble into the shell. There are 12 pores where the pentamers meet as well as 3-fold axis channels and dimer channels; none are larger than 3-4 Angstroms in diameter. The N-terminus of the protein is inside the shell, the C-terminus is outside (By similarity). Foreign proteins can be targeted to ectopic nanocompartments in E.coli upon coexpression with a construct using the 38 C-terminal residues of DypB (AC C0ZVK5), tested with GFP and luciferase. Probably only one molecule of each foreign protein is inside the nanocompartment due to its small interior space. Belongs to the encapsulin family. Family 1 subfamily.