Required for plastid development during embryogenesis (PubMed:24964212). Might be involved in chaperone functions or play a structural role in the thylakoid FtsH complex (Probable). 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. Truncated C-terminus.