Required for plastid development during embryogenesis (PubMed:24964212). Might be involved in chaperone functions or play a structural role in the thylakoid FtsH complex (PubMed:12185496). Homooligomer. Interacts with FtsHi4. 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. The predicted gene has been split into 2 genes: At3g16290 and At3g16300. The predicted gene has been split into 2 genes: At3g16290 and At3g16300.