theseus1 is an 855 residue, type i transmembrane protein that has an extracellular n-terminus and an intracellular c-terminus. the serine/threonine kinase domain that is typical of rlks is present on the intracellular c-terminal along with an adjacent binding site for atp. there are also two internal phosphorylation sites that could possibly act as molecular switching sites for the1 activation/suppression. the n-terminal contains a roughly 19 residue long dissociable sequence that is thought to be used for signaling about an issue in the cell wall.