Negatively modulates the activity of the FtsH protease for membrane substrates. Overexpression or stabilizing YccA counteracts the FtsH-mediated degradation of SecY when the SecYEG preprotein translocator is jammed. Both wild-type and the yccA11 mutant interact with the FtsH/HflKC complex. There are conflicting results regarding the localization of the C-terminus of this protein: According to a report, the C-terminus localizes in the periplasm (PubMed:10357810). Another report gives the C-terminus in the cytoplasm (PubMed:15919996). We show the periplasmic location. Regulated in a Cpx-dependent fashion. YccA is processively degraded by FtsH; degradation initiates via the approximately 20 residue N-terminal tail in a sequence non-specific manner. The deletion mutant yccA11 is resistant to FtsH-mediated degradation, probably because it is too short to be degraded by FtsH. No effect on SecY degradation. Belongs to the BI1 family.