Plays a fundamental role in microtubule-organizing center structure and function. As a component of the TREX-2 complex, involved in the export of mRNAs to the cytoplasm through the nuclear pores. Monomer (By similarity). Component of the TREX-2 complex (transcription and export complex 2), composed of at least ENY2, GANP, PCID2, SEM1, and either centrin CETN2 or CETN3. Centrosome of interphase and mitotic cells. Localizes to centriole distal lumen (By similarity). Localization at the nuclear pore complex requires NUP153 and TPR (By similarity). Belongs to the centrin family.