Functions in chloroplast biogenesis and chloroplast division. 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 FtsHi2. Ubiquitous but preferentially expressed in young leaves. Embryo defective (PubMed:24964212, PubMed:21139083). Impaired plastid biogenesis and thylakoid differentiation in embryo. Defects in the photosystem II protein complex formation (PubMed:24964212). Belongs to the AAA ATPase family. Lacks the conserved zinc-binding motif HEXXH, which presumably renders it inactive for proteolysis.