Functions in chloroplast biogenesis and chloroplast division (PubMed:10417716, PubMed:22900897). Required for plastid development during embryogenesis (PubMed:22900897, PubMed:24964212). Might be involved in chaperone functions or play a structural role in the thylakoid FtsH complex (PubMed:12185496). Oligomer. Embryo defective. In the N-terminal section; belongs to the AAA ATPase family. In the C-terminal section; belongs to the peptidase M41 family. Lacks the conserved zinc-binding motif HEXXH, which presumably renders it inactive for proteolysis.