protein import into chloroplast stroma GO:0045037 biological_process The targeting and import of proteins into the chloroplast stroma. Import depends on ATP hydrolysis catalyzed by stromal chaperones. Chloroplast stromal proteins, such as the S subunit of rubisco, have a N-terminal stromal-import sequence of about 44 amino acids which is cleaved from the protein precursor after import. protein transport into chloroplast stroma chloroplast stroma protein import protein transmembrane transport establishment of protein localization to chloroplast protein localization to chloroplast