This entry represents the RNA recognition motif 1 (RRM1) of RBM15.RNA-binding motif protein 15 (RBM15), also termed one-twenty two protein 1 (OTT1), is a novel mRNA export factor and component of the NXF1 pathway. It binds to NXF1 and serves as receptor for the RNA export element RTE []. It also possesses mRNA export activity and can facilitate the access of DEAD-box protein DBP5 to mRNA at the nuclear pore complex (NPC) []. RBM15 belongs to the Spen (split end) protein family, which contains three N-terminal RNA recognition motifs (RRMs), and a C-terminal SPOC (Spen paralogue and orthologue C-terminal) domain.
This entry represents the RNA recognition motif 2 (RRM2) of RBM15.RNA-binding motif protein 15 (RBM15), also termed one-twenty two protein 1 (OTT1), is a novel mRNA export factor and component of the NXF1 pathway. It binds to NXF1 and serves as receptor for the RNA export element RTE []. It also possesses mRNA export activity and can facilitate the access of DEAD-box protein DBP5 to mRNA at the nuclear pore complex (NPC) []. RBM15 belongs to the Spen (split end) protein family, which contains three N-terminal RNA recognition motifs (RRMs), and a C-terminal SPOC (Spen paralogue and orthologue C-terminal) domain.
This entry represents the RNA recognition motif 3 (RRM3) of RBM15.RNA-binding motif protein 15 (RBM15), also termed one-twenty two protein 1 (OTT1), is a novel mRNA export factor and component of the NXF1 pathway. It binds to NXF1 and serves as receptor for the RNA export element RTE []. It also possesses mRNA export activity and can facilitate the access of DEAD-box protein DBP5 to mRNA at the nuclear pore complex (NPC) []. RBM15 belongs to the Spen (split end) protein family, which contains three N-terminal RNA recognition motifs (RRMs), and a C-terminal SPOC (Spen paralogue and orthologue C-terminal) domain.
Nuclear RNA export factor 3 (NXF3) is a member of the nuclear RNA export factor (NXF) family of proteins, which plays a role in mediating the export of cellular mRNA from the nucleus to the cytoplasm for translation. Like NXF1 and NFX2, NXF3 has the ability to bind and export mRNA from the nucleus to the cytoplasm, but it uses a completely different mechanism []. The expression of NXF3 appears to be restricted to the testis [].
The vertebrate Tap protein is a member of the NXF family of shuttling transport receptors for nuclear export of mRNA. Tap has a modular structure, and its most C-terminal domain is important for binding to FG repeat-containing nuclear pore proteins (FG-nucleoporins) and is sufficient to mediate nuclear shuttling []. The structure of the C-terminal domain is composed of four helices []. The structure is related to the UBA domain.The NXF family of mRNA nuclear export factors includes vertebrate NXF1 (also called tip-associated protein or mRNA export factor TAP), NXF2 (also called cancer/testis antigen CT39 or TAP-like protein TAPL-2), Caenorhabditis elegans NXF1 (ceNXF1), Saccharomyces cerevisiae mRNA nuclear export factor Mex67p and similar proteins. NXF proteins can stimulate nuclear export of mRNAs and facilitate the export of unspliced viral mRNA containing the constitutive transport element. An NXF protein is multi-domain with a nuclear localization sequence (NLS), a non-canonical mRNA-binding domain, and four leucine-rich repeats (LLR) at the N-terminal region. Its C-terminal part contains a NTF2-like domain and a ubiquitin-associated (UBA)-like domain, joined by flexible Pro-rich linker. Caenorhabditis elegans NXF1 are essential for the nuclear export of poly(A)+mRNA. In budding yeast, Mex67p binds mRNAs through its adaptor Yra1/REF. It also interacts directly with Nab2, an essential shuttling mRNA-binding protein required for export. Moreover, Mex67p associates with both nuclear pore protein (nucleoporin) FG repeats and Hpr1, a component of the TREX/THO complex linking transcription and export [, , , , , , , , , , , , , , , ].
This entry represents the RNA recognition motif 1 (RRM1) of RBM15B.RNA binding motif protein 15B (RBM15B, also known as OTT3) is a paralogue of RBM15. Like RBM15, RBM15B has post-transcriptional regulatory activity. It is a nuclear protein sharing with RBM15 the association with the splicing factor compartment and the nuclear envelope as well as the binding to mRNA export factors NXF1 and Aly/REF [].RBM15B belongs to the Spen (split end) protein family, which shares a domain architecture comprising three N-terminal RNA recognition motifs (RRMs) and a C-terminal SPOC (Spen paralog and ortholog C-terminal) domain.
This entry represents the RNA recognition motif 2 (RRM2) of RBM15B.RNA binding motif protein 15B (RBM15B, also known as OTT3) is a paralogue of RBM15. Like RBM15, RBM15B has post-transcriptional regulatory activity. It is a nuclear protein sharing with RBM15 the association with the splicing factor compartment and the nuclear envelope as well as the binding to mRNA export factors NXF1 and Aly/REF [].RBM15B belongs to the Spen (split end) protein family, which shares a domain architecture comprising three N-terminal RNA recognition motifs (RRMs) and a C-terminal SPOC (Spen paralog and ortholog C-terminal) domain.
This entry represents the RNA recognition motif 3 (RRM3) of RBM15B.RNA binding motif protein 15B (RBM15B, also known as OTT3) is a paralogue of RBM15. Like RBM15, RBM15B has post-transcriptional regulatory activity. It is a nuclear protein sharing with RBM15 the association with the splicing factor compartment and the nuclear envelope as well as the binding to mRNA export factors NXF1 and Aly/REF [].RBM15B belongs to the Spen (split end) protein family, which shares a domain architecture comprising three N-terminal RNA recognition motifs (RRMs) and a C-terminal SPOC (Spen paralog and ortholog C-terminal) domain.
Mex67 is involved in the export of mRNA from the nucleus to the cytoplasm in Saccharomyces cerevisiae []. Vertebrate TAP (also called NXF1 for nuclear RNA export factor 1) is the orthologue of Mex67 []. TAP belongs to a multigene family with conserved modular architecture []. Other members of the family in humans are NXF2, NXF3, and NFX5. Both TAP(NXF1) and NXF2 bind mRNA and display RNA nuclear export activity []. NXF3 also has the ability to export mRNA from the nucleus to the cytoplasm but it uses a different mechanism []. NXF1 and NXF2 are predominantly nuclear, whereas the cytoplasmic presence of NXF3 and NXF5 suggests that they have a different cellular function [, ].Three functional domains of TAP have been characterised: the RNA-binding domain, the Nuclear Transport Factor 2 (NTF2)-like domain, and the ubiquitin-associated (UBA) domain. The RNA-binding domain (RBD) of TAP is located at its amino terminus and is composed of two RNA recognition motifs (RRMs) and one leucine-rich region [, ]. Once bound to mRNA, TAP escorts the messenger ribonucleoprotein (mRNP) to the nuclear pore, where TAP interacts with nucleoporins via the NTF2-like (NTF2L) and UBA domains [].
