title: The Immune Adaptor SLP-76 Binds to SUMO-RANGAP1 at Nuclear Pore Complex Filaments to Regulate Nuclear Import of Transcription Factors in T Cells.
abstract: While immune cell adaptors regulate proximal T cell signaling, direct regulation of the nuclear pore complex (NPC) has not been reported. NPC has cytoplasmic filaments composed of RanGAP1 and RanBP2 with the potential to interact with cytoplasmic mediators. Here, we show that the immune cell adaptor SLP-76 binds directly to SUMO-RanGAP1 of cytoplasmic fibrils of the NPC, and that this interaction is needed for optimal NFATc1 and NF-κB p65 nuclear entry in T cells. Transmission electron microscopy showed anti-SLP-76 cytoplasmic labeling of the majority of NPCs in anti-CD3 activated T cells. Further, SUMO-RanGAP1 bound to the N-terminal lysine 56 of SLP-76 where the interaction was needed for optimal RanGAP1-NPC localization and GAP exchange activity. While the SLP-76-RanGAP1 (K56E) mutant had no effect on proximal signaling, it impaired NF-ATc1 and p65/RelA nuclear entry and in vivo responses to OVA peptide. Overall, we have identified SLP-76 as a direct regulator of nuclear pore function in T cells.
authors: Cell Signaling Section, Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK.
authors: Hebin
authors: H
authors: Liu
authors: Cell Signaling Section, Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK.
authors: Helga
authors: H
authors: Schneider
authors: Cell Signaling Section, Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK.
authors: Asha
authors: A
authors: Recino
authors: School of Biological and Biomedical Sciences, Durham University, Science Laboratories, South Road, Durham DH1 3LE, UK.
authors: Christine
authors: C
authors: Richardson
authors: School of Biological and Biomedical Sciences, Durham University, Science Laboratories, South Road, Durham DH1 3LE, UK.
authors: Martin W
authors: MW
authors: Goldberg
authors: Cell Signaling Section, Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK. Electronic address: cer51@cam.ac.uk.
authors: Christopher E
authors: CE
authors: Rudd
mesh_terms: D021581:Active Transport, Cell Nucleus; D048868:Adaptor Proteins, Signal Transducing / Q000276:immunology* / Q000378:metabolism*; D000818:Animals; D002460:Cell Line; D020690:GTPase-Activating Proteins / Q000378:metabolism*; D006801:Humans; D019169:Jurkat Cells; D051379:Mice; D046529:Microscopy, Electron, Transmission; D050778:NFATC Transcription Factors / Q000378:metabolism; D022022:Nuclear Pore / Q000378:metabolism; D010750:Phosphoproteins / Q000276:immunology* / Q000378:metabolism*; D011485:Protein Binding; D025841:Small Ubiquitin-Related Modifier Proteins / Q000378:metabolism*; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism* / Q000648:ultrastructure; D051996:Transcription Factor RelA / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D020690:GTPase-Activating Proteins; D050778:NFATC Transcription Factors; C494003:NFATC1 protein, human; C494005:Nfatc1 protein, mouse; D010750:Phosphoproteins; C092317:RANGAP1 protein, human; C498143:RELA protein, human; C085844:Rangap1 protein, mouse; C498144:Rela protein, mouse; C092947:SLP-76 signal Transducing adaptor proteins; D025841:Small Ubiquitin-Related Modifier Proteins; D051996:Transcription Factor RelA