TOC33 (AT1G02280) is a component of the chloroplast protein import machinery, which consists of three core components, namely the pore-forming Toc75 (AT1G35860, AT3G46740, AT4G09080, AT5G19620) and two GTPases Toc33 (AT1G02280) and Toc159 (AT4G02510) . Toc33 and Toc159 may regulate precursor protein perception and their transport to the translocation pore.
