Search Results
Overview
| Uniprot ID | Q86V81 |
|---|---|
| Protein Name | THO complex subunit 4 |
| Gene Name | ALYREF |
| Organism | Homo sapiens |
Kla Sites from experimental identification
| Position | Flanking peptide |
|---|---|
| 134 | AEFGTLKKAAVHYDR |
| 14 | MSLDDIIKLNRSQRG |
| 164 | ADALKAMKQYNGVPL |
| 235 | RGAGRNSKQQLSAEE |
| 81 | PAPYSRPKQLPDKWQ |
| 86 | RPKQLPDKWQHDLFD |
Function
Functions as an mRNA export adapter; component of the transcription/export (TREX) complex which is thought to couple mRNA transcription, processing and nuclear export, and specifically associates with spliced mRNA and not with unspliced pre-mRNA (PubMed:15833825, PubMed:15998806, PubMed:17190602). TREX is recruited to spliced mRNAs by a transcription-independent mechanism, binds to mRNA upstream of the exon-junction complex (EJC) and is recruited in a splicing- and cap-dependent manner to a region near the 5' end of the mRNA where it functions in mRNA export to the cytoplasm via the TAP/NXF1 pathway (PubMed:15833825, PubMed:15998806, PubMed:17190602). Involved in the nuclear export of intronless mRNA; proposed to be recruited to intronless mRNA by ATP-bound DDX39B (PubMed:17984224). Plays a key role in mRNP recognition and mRNA packaging by bridging the mRNP-bound EJC and the TREX core complex (PubMed:37020021). TREX recruitment occurs via an interaction between ALYREF/THOC4 and the cap-binding protein NCBP1 (PubMed:15833825, PubMed:15998806, PubMed:17190602, PubMed:37020021). Required for TREX complex assembly and for linking DDX39B to the cap-binding complex (CBC) (PubMed:15998806, PubMed:17984224, PubMed:37020021). Binds mRNA which is thought to be transferred to the NXF1-NXT1 heterodimer for export (TAP/NXF1 pathway) (PubMed:11675789, PubMed:11707413, PubMed:11979277, PubMed:15833825, PubMed:15998806, PubMed:17190602, PubMed:18364396, PubMed:22144908, PubMed:22893130, PubMed:23222130, PubMed:25662211). In conjunction with THOC5 functions in NXF1-NXT1 mediated nuclear export of HSP70 mRNA; both proteins enhance the RNA binding activity of NXF1 and are required for NXF1 localization to the nuclear rim (PubMed:19165146). Involved in mRNA export of C5-methylcytosine (m5C)-containing mRNAs: specifically recognizes and binds m5C mRNAs and mediates their nucleo-cytoplasmic shuttling (PubMed:28418038). Acts as a chaperone and promotes the dimerization of transcription factors containing basic leucine zipper (bZIP) domains and thereby promotes transcriptional activation (PubMed:10488337). Involved in transcription elongation and genome stability (PubMed:12438613)
Protein Sequence
Gene Ontology
| Classification | GO ID | Description |
|---|---|---|
| Cellular Component | GO:0071013 | catalytic step 2 spliceosome |
| Cellular Component | GO:0005737 | cytoplasm |
| Cellular Component | GO:0005829 | cytosol |
| Cellular Component | GO:0070062 | extracellular exosome |
| Cellular Component | GO:0016020 | membrane |
| Cellular Component | GO:0016607 | nuclear speck |
| Cellular Component | GO:0005654 | nucleoplasm |
| Cellular Component | GO:0005634 | nucleus |
| Cellular Component | GO:0000346 | transcription export complex |
| Molecular Function | GO:0062153 | C5-methylcytidine-containing RNA reader activity |
| Molecular Function | GO:0003729 | mRNA binding |
| Molecular Function | GO:0003723 | RNA binding |
| Biological Process | GO:0006406 | mRNA export from nucleus |
| Biological Process | GO:0016071 | mRNA metabolic process |
| Biological Process | GO:0006397 | mRNA processing |
| Biological Process | GO:0001649 | osteoblast differentiation |
| Biological Process | GO:2000622 | regulation of nuclear-transcribed mRNA catabolic process, nonsense-mediated decay |
| Biological Process | GO:0006405 | RNA export from nucleus |
| Biological Process | GO:0008380 | RNA splicing |
Reference
[1] Yang D, Yin J, Shan L, Yi X, Zhang W et al.. Identification of lysine-lactylated substrates in gastric cancer cells.. iScience 25(7):104630. 2022 Jul 15. PMID: 35800753.
[2] Yang Z, Yan C, Ma J, Peng P, Ren X et al.. Lactylome analysis suggests lactylation-dependent mechanisms of metabolic adaptation in hepatocellular carcinoma.. Nat Metab 5(1):61-79. 2023 Jan. PMID: 36593272.
[3] He C, Zhang J, Bai X, Lu C, Zhang K. Lysine lactylation-based insight to understanding the characterization of cervical cancer.. Biochim Biophys Acta Mol Basis Dis 1870(7):167356. 2024 Oct. PMID: 39025375.
[4] Bao Q, Wan N, He Z, Cao J, Yuan W et al.. Subcellular Proteomic Mapping of Lysine Lactylation.. J Am Soc Mass Spectrom 35(12):3221-3232. 2024 Dec 4. PMID: 39569522.
[5] Shi CM, Wang QC, Li XL, Yang YH, Tang XY et al.. Global Profiling of Protein Lactylation in Human Hippocampi.. Proteomics Clin Appl 19(2):e202400061. 2025 Mar. PMID: 39610256.
[6] Guo X, Ren X, Yan C, Huang H. Quantitative Proteomics Reveals the Role of Lysine Lactylation in Lenalidomide-Resistance in Multiple Myeloma Cells.. ACS Chem Biol 20(7):1728-1738. 2025 Jul 18. PMID: 40590393.
[7] He J, Lai T, Zhou Z, Yang H, Lei Z et al.. Multiomics profiling reveals the involvement of protein lactylation in nonhomologous end joining pathway conferring radioresistance in lung adenocarcinoma cell.. Sci Rep 15(1):24651. 2025 Jul 9. PMID: 40634431.
[8] Wu Q, Li Z, Gong T, Zheng X, Zhou X et al.. Porphyromonas gingivalis infection induces lysine lactylation reprogramming in human umbilical vein endothelial cells.. Front Cell Infect Microbiol 16:1706727. 2026. PMID: 41696360.