Probable ATP-dependent zinc metallopeptidase. Involved in the degradation of the light-harvesting complex of photosystem II (LHC II) during senescence or high light acclimation. Binds 1 zinc ion per subunit. A number of isoforms are produced. According to EST sequences. The conserved lumenal (CL) domain (84-162) is present only in some FtsH homologs from organisms performing oxygenic photosynthesis. No visible phenotype. In the N-terminal section; belongs to the AAA ATPase family. In the C-terminal section; belongs to the peptidase M41 family.