Nucleoprotein TPR - P12270 (TPR_HUMAN)


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Component of the nuclear pore complex (NPC), a complex required for the trafficking across the nuclear envelope. Functions as a scaffolding element in the nuclear phase of the NPC essential for normal nucleocytoplasmic transport of proteins and mRNAs, plays a role in the establishment of nuclear-peripheral chromatin compartmentalization in interphase, and in the mitotic spindle checkpoint signaling during mitosis. Involved in the quality control and retention of unspliced mRNAs in the nucleus; in association with NUP153, regulates the nuclear export of unspliced mRNA species bearing constitutive transport element (CTE) in a NXF1- and KHDRBS1-independent manner. Negatively regulates both the association of CTE-containing mRNA with large polyribosomes and translation initiation. Does not play any role in Rev response element (RRE)-mediated export of unspliced mRNAs. Implicated in nuclear export of mRNAs transcribed from heat shock gene promoters; associates both with chromatin in the HSP70 promoter and with mRNAs transcribed from this promoter under stress-induced conditions. Modulates the nucleocytoplasmic transport of activated MAPK1/ERK2 and huntingtin/HTT and may serve as a docking site for the XPO1/CRM1-mediated nuclear export complex. According to some authors, plays a limited role in the regulation of nuclear protein export (PubMed:22253824 and PubMed:11952838). Plays also a role as a structural and functional element of the perinuclear chromatin distribution; involved in the formation and/or maintenance of NPC-associated perinuclear heterochromatin exclusion zones (HEZs). Finally, acts as a spatial regulator of the spindle-assembly checkpoint (SAC) response ensuring a timely and effective recruitment of spindle checkpoint proteins like MAD1L1 and MAD2L1 to unattached kinetochore during the metaphase-anaphase transition before chromosome congression. Its N-terminus is involved in activation of oncogenic kinases. UniProt
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Subunit Structure
Interacts with IFI204 (via C-terminal region). Interacts with IFI203 (By similarity). Homodimer. Part of the nuclear pore complex (NPC). Associates with the XPO1/CRM1-mediated nuclear export complex, the Importin alpha/Importin beta receptor and the dynein 1 complex. Interacts (via C-terminal domain) with the KPNB1; the interaction occurs in a RanGTP-dependent manner. Interacts (via C-terminal regionand phosphorylated form) with MAPK1/ERK2 (via phosphorylated form); the interaction requires dimerization of MAPK1/ERK2 and increases following EGF stimulation. Interacts with MAPK3/ERK1; the interaction increases following EGF stimulation. Interacts (via coiled coil region) with NUP153; the interaction is direct. Interacts with HSF1; the interaction increases in a stress-responsive manner and stimulates export of stress-induced HSP70 mRNA. Interacts with huntingtin/HTT; the interaction is inhibited by aggregated huntingtin/HTT forms with expanded polyglutamine stretch. Interacts with MAD1L1 (via N-terminal region), MAD2L1, and TTK; the interactions occurs in a microtubule-independent manner. Interacts (via middle region) with DYNLL1. Interacts with DCTN1, dynein, NUP153 and tubulin. Interacts with MTA1. UniProt
The N-terminal domain mediates intranuclear attachment to the nuclear pore complex. The C-terminal domain mediates its nuclear import. UniProt
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