Enables the recognition and targeting of unfolded and aggregated proteins to the ClpC protease or to other proteins involved in proteolysis. Homodimer. The N-terminal domain probably binds unfolded/aggregated proteins; the C-terminal domain interacts with ClpC. Belongs to the MecA family. This protein is unrelated to the penicillin-binding protein Pbp2a, also called MecA, that confers resistance to methicillin in several strains of S.aureus (MRSA) and is used as a marker for the identification of MRSA isolates.