Involved in calcium binding and microtubule stabilization (PubMed:12167714, PubMed:15162379, PubMed:15958728). Acts as a negative regulator of TSC22D1-mediated apoptosis, via interaction with and destabilization of TSC22D1 protein (PubMed:18325344). {ECO:0000269|PubMed:12167714, ECO:0000269|PubMed:15162379, ECO:0000269|PubMed:15958728, ECO:0000269|PubMed:18325344}. This is the function of ENSG00000133112 (TPT1, tumor protein, translationally-controlled 1).