UniprotKB/SwissProt ID: A1Z8P9 (A1Z8P9)
Gene Name:
Mgtor
Organism: Drosophila melanogaster (Fruit fly)
Function: Component of the nuclear pore complex (NPC), a complex required for the trafficking across the nuclear envelope (PubMed:9152019). Functions as a scaffolding element in the nuclear phase of the NPC (PubMed:12027452, PubMed:15356261). Plays a role in chromosomal organization and gene expression regulation; stimulates transcription by promoting the formation of an open chromatin environment (PubMed:12027452, PubMed:20174442). Binds chromatin to nucleoporin-associated regions (NARs) that define transcriptionally active regions of the genome (PubMed:20174442). Associates with extended chromosomal regions that alternate between domains of high density binding with those of low occupancy (PubMed:20174442). Preferentially binds to NARs of the male X chromosome (PubMed:20174442). In males, together with Nup153, required for the localization of the male-specific lethal (MSL) histone acetyltransferase complex to the X chromosome and therefore for the transcription of dosage compensation genes (PubMed:16543150). In males, restrains dosage-compensated expression at the level of nascent transcription probably by interacting with the MSL complex and by modulating RNA Polymerase II phosphorylation status and activity (PubMed:34133927). During mitosis forms a gel-like spindle matrix complex together with Skeletor (Skel), Chro, east, and Asator embedding the microtubule spindle apparatus (PubMed:15356261, PubMed:15962301, PubMed:19273613, PubMed:22855526). During interphase localizes Mad1 to the nuclear pore complex and thereby might act as a scaffold to assemble the Mad1-C-Mad2 complex, a heterotetramer that catalyzes the structural conversion of open-Mad2 (O-Mad2) into closed-Mad2 (C-Mad2) which is essential for spindle-assembly checkpoint (SAC) (PubMed:31913420). During the metaphase-anaphase transition and before chromosome congression, is phosphorylated by Msp-1; this modification releases Mad1 from the nuclear pore complex and thereby promotes assembly of SAC ensuring a timely and effective recruitment of spindle checkpoint proteins like Mad1, Mad2 and Mps1 to unattached kinetochores (KT) (PubMed:22855526, PubMed:26714316, PubMed:31913420). In testes, has a role in stem cell asymmetric division and maintenance via regulation of mitotic spindle assembly checkpoint (SAC) complex (PubMed:26714316)
Other Modifications: View all modification sites in dbPTM
Protein Subcellular Localization: Nucleus. Nucleus matrix. Nucleus lamina. Nucleus envelope. Nucleus membrane. Nucleus, nuclear pore complex. Cytoplasm, cytoskeleton, spindle. Chromosome, centromere, kinetochore. Midbody
|
|
|
