AKAP8-like protein, Helicase A-binding protein 95, HAP95, Homologous to AKAP95 protein, HA95, Neighbor of A-kinase-anchoring protein 95, Neighbor of AKAP95 | NAKAP, NAKAP95
Primary ID
Q9ULX6
Links
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Type
protein
Relations
3
Function
Could play a role in constitutive transport element (CTE)-mediated gene expression by association with DHX9. Increases CTE-dependent nuclear unspliced mRNA export (PubMed:10748171, PubMed:11402034). Proposed to target PRKACA to the nucleus but does not seem to be implicated in the binding of regulatory subunit II of PKA (PubMed:10761695, PubMed:11884601). May be involved in nuclear envelope breakdown and chromatin condensation. May be involved in anchoring nuclear membranes to chromatin in interphase and in releasing membranes from chromating at mitosis (PubMed:11034899). May regulate the initiation phase of DNA replication when associated with TMPO isoform Beta (PubMed:12538639). Required for cell cycle G2/M transition and histone deacetylation during mitosis. In mitotic cells recruits HDAC3 to the vicinity of chromatin leading to deacetylation and subsequent phosphorylation at 'Ser-10' of histone H3; in this function seems to act redundantly with AKAP8 (PubMed:16980585). May be involved in regulation of pre-mRNA splicing (PubMed:17594903).
These results support the proposal that both RHA and HAP95 facilitated the nuclear export of unspliced, CTE-containing mRNA in human cells. we have extended this earlier study by mapping the functional domains of HAP95 and providing strong evidence for a direct role of HAP95 in RHA-mediated nuclear export of CTE-containing mRNA.
These results support the proposal that both RHA and HAP95 facilitated the nuclear export of unspliced, CTE-containing mRNA in human cells. we have extended this earlier study by mapping the functional domains of HAP95 and providing strong evidence for a direct role of HAP95 in RHA-mediated nuclear export of CTE-containing mRNA.
We report evidence for a novel nuclear export signal in HAP95 and showed that the domains involved in RHA binding and nuclear localization are required for CTE activation. Finally, we showed that HAP95 synergizes significantly with RHA on CTE-mediated reporter gene expression and promotes nuclear export of unspliced mRNA in transfected cells. Taken together, these data support the proposal that HAP95 specifically facilitates CTE-mediated gene expression by directly binding to RHA.