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 nuclear pore complex (NPC)-associated TREX-2 complex (transcription and export complex 2), composed of at least GANP, 2 copies of ENY2, PCID2, SEM1/DSS1, and either centrin CETN2 or centrin CETN3. The TREX-2 complex also associates with ALYREF/ALY and with the nucleoporin NUP153 (PubMed:22307388, PubMed:23591820). Centrosome of interphase and mitotic cells (PubMed:9256449). Localizes to centriole distal lumen (PubMed:26337392). Localization at the nuclear pore complex requires NUP153 and TPR (PubMed:23591820). Belongs to the centrin family.