Accessory protein regulating the assembly of the plastidial Clp protease system (PubMed:21266658, PubMed:25921872). CLPT1 first binds to the heptameric P-ring containing the CLP3-6 subunits followed by CLPT2, and only then does the P-ring combine with the R-ring composed of the clpP1 and CLPR1-4 subunits (PubMed:21266658). Once the core complex is fully assembled, it then associates to the CLPC chaperone partner to form the functional protease (PubMed:21266658). CLPT2 and CLPT1 are partially redundant (PubMed:25921872). Monomer and homodimer (PubMed:21266658). The dimers monomerize before association to the P-ring (PubMed:21266658). Component of the chloroplastic Clp protease core complex which consist of at least 16 proteins: CLPP4 (3 copies), CLPP5 (3 copies), CLPR4 (2 copies), ClpP1 (1 copy), CLPP6 (1 copy), CLPR2 (1 copy), CLPT1 (1 copy), CLPT2 (1 copy) and 3 copies of CLPP3 and/or CLPR1 and/or CLPR3 (PubMed:21266658, PubMed:14593120). Interacts with AHK2 (PubMed:18642946). Interacts with CPN21 (PubMed:25921872). No interactions with CLPS1 (PubMed:23898032). The MYFF motif is functionally important for stabilization of the overall ClpPR complex. No visible phenotype (PubMed:21266658, PubMed:25921872). Clpt1 and clpt2 double mutants show delayed development, reduced plant growth, and virescent, serrated leaves (PubMed:25921872). Clpt1 and clpt2 double mutants are seedling lethal under autotrophic conditions (PubMed:21266658). Belongs to the ClpA/ClpB family.