PCID2, a subunit of the Drosophila TREX-2 nuclear export complex, is essential for both mRNA nuclear export and its subsequent cytoplasmic trafficking

• Published in: RNA biology 2021-11, Vol.18 (11), p.1969-1980
• Main Authors: Glukhova, A. A., Kurshakova, M. M., Nabirochkina, E. N., Georgieva, S. G., Kopytova, D. V.
• Format: Article
• Language: English
• Subjects: Active Transport, Cell Nucleus; Animals; Cell Nucleus - genetics; Cell Nucleus - metabolism; Cytoplasm - genetics; Cytoplasm - metabolism; Cytoplasmic mRNA transport; Drosophila melanogaster - genetics; Drosophila melanogaster - growth & development; Drosophila melanogaster - metabolism; Drosophila Proteins - genetics; Drosophila Proteins - metabolism; Gene Expression Regulation; mRNA trafficking; PCID2; Research Paper; RNA, Messenger - genetics; RNA, Messenger - metabolism; TREX-2
• ISSN: 1547-6286; 1555-8584
• DOI: 10.1080/15476286.2021.1885198

The TREX-2 complex is essential for the general nuclear mRNA export in eukaryotes. TREX-2 interacts with the nuclear pore and transcriptional apparatus and links transcription to the mRNA export. However, it remains poorly understood how the TREX-2-dependent nuclear export is connected to the subsequent stages of mRNA trafficking. Here, we show that the PCID2 subunit of Drosophila TREX-2 is present in the cytoplasm of the cell. The cytoplasmic PCID2 directly interacts with the NudC protein and this interaction maintains its stability in the cytoplasm. Moreover, PCID2 is associated with the cytoplasmic mRNA and microtubules. The PCID2 knockdown blocks nuclear export of mRNA and also affects the general mRNA transport into the cytoplasm. These data suggest that PCID2 could be the link between the nuclear TREX-2-dependent export and the subsequent cytoplasmic trafficking of mRNA.