The THO complex is required for cell proliferation and for proper export of heat-shock mRNAs under heat stress. Component of the THO complex, composed of at least e(y)2, HPR1, THO2, THOC5, THOC6 and THOC7 (PubMed:15133499). Interacts with piwi; the interaction might be partly RNA-mediated (PubMed:28472469). Interacts with CG9890 (PubMed:30713769). Shuttles between nucleus and cytoplasm. Expressed in ovaries (at protein level). Belongs to the THOC5 family.