Stimulator of protein export for NES-containing proteins (PubMed:10567585). Also plays a role in the nuclear export of U1 snRNA, tRNA, and mRNA (PubMed:10848583). The NXF1-NXT1 heterodimer is involved in the export of HSP70 mRNA in conjunction with ALYREF/THOC4 and THOC5 (PubMed:11259602, PubMed:19165146). {ECO:0000269|PubMed:10567585, ECO:0000269|PubMed:10848583, ECO:0000269|PubMed:11259602, ECO:0000269|PubMed:19165146}. This is the function of Ensembl gene identifier ENSG00000132661 (NXT1, nuclear transport factor 2 like export factor 1).