An unexpected finding of this study is that the ADEP-28-bound HsClpP tetradecamer adopts a compact conformation,which decreases the height of the ADEP-28−HsClpP cylinder by ∼8 Å (compare the apo form shown in Figure 4Bi and the ADEP-28−HsClpP complex shown in Figure 4Bii) and bringsthe catalytic Ser153 residues from two apposing subunits ∼7Å closer (Figure 4Bi,ii).