LMP007256 UniProt Annotations
Gene Name Nup53p Protein Entry NUP53_YEAST UniProt ID Q03790 Species Yeast (S288c)
Comment type Description Domain Contains FG repeats. FG repeats are interaction sites for karyopherins (importins, exportins) and form probably an affinity gradient, guiding the transport proteins unidirectionally with their cargo through the NPC. FG repeat regions are highly flexible and lack ordered secondary structure. The overall conservation of FG repeats regarding exact sequence, spacing, and repeat unit length is limited. FG repeat types and their physico-chemical environment change across the NPC from the nucleoplasmic to the cytoplasmic side Domain Contains FG repeats. FG repeats are interaction sites for karyopherins (importins, exportins) and form probably an affinity gradient, guiding the transport proteins unidirectionally with their cargo through the NPC. FG repeat regions are highly flexible and lack ordered secondary structure. The overall conservation of FG repeats regarding exact sequence, spacing, and repeat unit length is limited. FG repeat types and their physico-chemical environment change across the NPC from the nucleoplasmic to the cytoplasmic side. {ECO:0000269|PubMed:12403813}. Domain The RRM Nup35-type domain might be involved in the control of mitosis Domain The RRM Nup35-type domain might be involved in the control of mitosis. {ECO:0000269|PubMed:12403813}. Function Functions as a component of the nuclear pore complex (NPC). NPC components, collectively referred to as nucleoporins (NUPs), can play the role of both NPC structural components and of docking or interaction partners for transiently associated nuclear transport factors. Active directional transport is assured by both, a Phe-Gly (FG) repeat affinity gradient for these transport factors across the NPC and a transport cofactor concentration gradient across the nuclear envelope (GSP1 and GSP2 GTPases associated predominantly with GTP in the nucleus, with GDP in the cytoplasm). NUP53 may play an important role in cell cycle regulation by inhibiting PSE1 transport functions during mitosis and sequestration of MAD1-MAD2 in a cell cycle-dependent manner. It also seems to play an important role in de novo NPC assembly by associating with nuclear membranes and driving their proliferation. {ECO:0000269|PubMed:11352933, ECO:0000269|PubMed:12403813, ECO:0000269|PubMed:12473689, ECO:0000269|PubMed:12604785, ECO:0000269|PubMed:14697200, ECO:0000269|PubMed:9864357}. Interaction P38181:NUP170; NbExp=5; IntAct=EBI-27321, EBI-11756; Miscellaneous Present with 2060 molecules/cell in log phase SD medium Miscellaneous Present with 2060 molecules/cell in log phase SD medium. {ECO:0000269|PubMed:14562106}. Ptm Phosphorylated by CDC28. {ECO:0000269|PubMed:14574415, ECO:0000269|PubMed:18407956, ECO:0000269|PubMed:19779198, ECO:0000269|PubMed:9864357}. Similarity Contains 1 RRM Nup35-type domain Similarity Contains 1 RRM Nup35-type domain. {ECO:0000255|PROSITE-ProRule:PRU00804}. Subcellular Location Nucleus, nuclear pore complex. Nucleus membrane; Peripheral membrane protein; Cytoplasmic side. Nucleus membrane; Peripheral membrane protein; Nucleoplasmic side. Note=Symmetric distribution. Subunit The nuclear pore complex (NPC) constitutes the exclusive means of nucleocytoplasmic transport. NPCs allow the passive diffusion of ions and small molecules and the active, nuclear transport receptor-mediated bidirectional transport of macromolecules such as proteins, RNAs, ribonucleoparticles (RNPs), and ribosomal subunits across the nuclear envelope. The 55-60 MDa NPC is composed of at least 31 different subunits: ASM4, CDC31, GLE1, GLE2, NDC1, NIC96, NSP1, NUP1, NUP2, NUP100, NUP116, NUP120, NUP133, NUP145, NUP157, NUP159, NUP170, NUP188, NUP192, NUP42, NUP49, NUP53, NUP57, NUP60, NUP82, NUP84, NUP85, POM152, POM34, SEH1 and SEC1. Due to its 8-fold rotational symmetry, all subunits are present with 8 copies or multiples thereof. NUP53 interacts with MAD1-MAD2. During mitosis NUP53 changes its binding partner within the NPC from NUP170 to NIC96, exposing a high affinity binding site for the karyopherin PSE1, and retaining it in the NPC, while MAD2 is released. It forms a subcomplex with ASM4 and NDC1. {ECO:0000269|PubMed:10688190, ECO:0000269|PubMed:11283351, ECO:0000269|PubMed:9864357}.
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