Chaperone receptor mediating Hsp90-dependent protein targeting to chloroplasts. Bi-functional preprotein receptor acting on both sides of the membrane. Not essential for an efficient import of pre-proteins into plastids. Part of the Toc complex and of the intermembrane space complex. Expressed in roots, cotyledons, leaves and flower buds. The transmembrane domain and its C-terminal lysine-rich flanking region (LFR) (26-61) are both necessary and sufficient for targeting to the outer envelope membrane. No visible phenotype.