Nuclear RNA export factor 1, also known as NXF1 or TAP, is a protein which in humans is encoded by the NXF1gene.
Function
This gene is one member of a family of nuclear RNA export factor genes. Common domain features of this family are a noncanonical RNP-type RNA-binding domain, 4 leucine-rich repeats, a nuclear transportfactor 2 -like domain that allows heterodimerization with NTF2-related export protein-1, and a ubiquitin-associated domain that mediates interactions with nucleoporins. Alternative splicing results in transcript variants. The LRRs and NTF2-like domains are required for export activity. The encoded protein of this gene shuttles between the nucleus and the cytoplasm and binds in vivo to poly+ RNA. It is the vertebrate homologue of the yeast protein Mex67p. The encoded protein overcomes the mRNA export block caused by the presence of saturating amounts of CTE RNA of type D retroviruses. A variant allele of the homologous Nxf1 gene in mice suppresses a class of mutations caused by integration of an endogenous retrovirus into an intron.
In molecular biology, another name for the protein NXF1 is TAP. In particular this entry focuses on the C-terminal domain, which also contains the UBA. This entry contains the NXF family of shuttling transport receptors for nuclear export of mRNA, which include:
vertebrate mRNA export factor TAP or nuclear RNA export factor 1.
yeast mRNA export factor MEX67. Members of the NXF family have a modular structure. A nuclear localization sequence and a noncanonical RNA recognition motif followed by four LRR repeats are located in its N-terminal half. The C-terminal half contains a NTF2 domain followed by a second domain, TAP-C. The TAP-C domain is important for binding to FG repeat-containing nuclear pore proteins and is sufficient to mediate nuclear shuttling.
The Tap-C domain is made of four alpha helices packed against each other. The arrangement of helices1, 2 and 3 is similar to that seen in a UBA fold. and is joined to the next module by flexible 12-residue Pro-rich linker.
Tap can form a multimeric complex with itself and with other members of the NXF family. Three functional domains of Tap have been well characterized: the RNA-binding domain, the Nuclear TransportFactor 2 -like domain, and the ubiquitin-associated domain.
