GO:0070762 nuclear pore transmembrane ring

The nuclear pore complex (NPC) is the sole gateway for nucleocytoplasmic transport in eukaryotic cells, and its stable anchorage to the nuclear envelope is essential for cell function. GO:0070762, the nuclear pore transmembrane ring, is a subcomplex of the NPC that spans the nuclear membrane and anchors the NPC to the nuclear envelope. This term is a cellular_component in the Gene Ontology and is conserved from yeast to vertebrates, making it a focal point for studies of NPC architecture and biogenesis. Researchers studying nuclear pore transmembrane ring-related genes often need to determine whether a candidate gene is causally involved in NPC assembly, nuclear envelope stability, and related disease processes. The transmembrane ring is composed of Pom152p, Pom34p, and Ndc1p in S. cerevisiae, and Gp210, Ndc1, and Pom121 in vertebrates. Components are arranged in 8-fold symmetrical spokes around the central transport channel, and a single spoke can be isolated and is sometimes referred to as the Ndc1 complex. High-resolution transmission electron microscopy has revealed the spoke ring and anchorage of the NPC, providing a structural framework for understanding how the transmembrane ring connects the NPC to the nuclear envelope. In addition, multiscale structural analysis of the yeast NPC has advanced our understanding of its overall architecture, including the transmembrane ring. The biogenesis of the NPC, including the transmembrane ring, requires accessory factors such as Brl1 and Brr6, which localize to NPC assembly sites and promote biogenesis in S. cerevisiae. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a research-grade overview of GO:0070762, its components, assembly, regulation, disease relevance, and experimental methods for CRISPR-based modeling.

GO:0070762 (nuclear pore transmembrane ring) is defined as a subcomplex of the nuclear pore complex (NPC) that spans the nuclear membrane and anchors the NPC to the nuclear envelope. In S. cerevisiae, the transmembrane ring is composed of Pom152p, Pom34p, and Ndc1p. In vertebrates, it is composed of Gp210, Ndc1, and Pom121. Components are arranged in 8-fold symmetrical spokes around the central transport channel. A single spoke can be isolated and is sometimes referred to as the Ndc1 complex. The term has synonyms NDC1 complex and NDC1 subcomplex.

The nuclear pore transmembrane ring is critical for NPC anchorage and biogenesis, and its dysfunction can compromise nuclear envelope integrity and nucleocytoplasmic transport. Because the transmembrane ring spans the nuclear membrane and anchors the NPC, it is central to maintaining the physical connection between the NPC and the nuclear envelope. Structural studies have revealed the spoke ring and anchorage architecture, providing a basis for understanding how mutations or assembly defects might affect NPC function. In S. cerevisiae, Brl1 and Brr6 are required for NPC biogenesis, and their localization to assembly sites highlights the importance of accessory factors in transmembrane ring formation. Multiscale structural analysis of the yeast NPC further underscores the complexity and functional significance of this subcomplex. Therefore, GO:0070762 is a key term for researchers investigating nuclear envelope biology, NPC assembly, and related diseases.

The following genes and proteins are key components or regulators of the nuclear pore transmembrane ring (GO:0070762) based on verified literature.

The assembly and function of the nuclear pore transmembrane ring are regulated by dedicated factors. In S. cerevisiae, Brr6 and Brl1 localize to nuclear pore complex assembly sites to promote their biogenesis. An amphipathic helix in Brl1 is required for nuclear pore complex biogenesis, indicating that specific structural motifs regulate assembly. These factors ensure proper formation and anchorage of the transmembrane ring during NPC biogenesis. Additionally, the 8-fold symmetrical arrangement of spokes and the ability to isolate a single Ndc1 complex suggest that the transmembrane ring is a modular structure whose assembly may be coordinated with other NPC subcomplexes.

The nuclear pore transmembrane ring anchors the NPC to the nuclear envelope, and its dysfunction could compromise nuclear envelope integrity. While direct disease associations for GO:0070762 components are not detailed in the verified citations, the fundamental role of the transmembrane ring in NPC architecture suggests that defects in its components may contribute to nuclear envelope-related pathologies.

Factors required for NPC biogenesis, such as Brl1 and Brr6, are essential for transmembrane ring formation. Disruption of these assembly factors could lead to NPC biogenesis defects, which may impact cell viability and function. Understanding these processes is relevant to diseases linked to nuclear pore complex dysfunction.

The conservation of transmembrane ring components from yeast to vertebrates allows the use of model organisms to study human disease-related mechanisms. Structural and genetic studies in S. cerevisiae provide a foundation for investigating how mutations in vertebrate orthologs might affect NPC function and contribute to disease.

High-resolution transmission electron microscopy has been used to reveal the spoke ring and anchorage of the nuclear pore complex, providing detailed structural information about the transmembrane ring. This method is essential for visualizing the 8-fold symmetrical arrangement of spokes around the central transport channel.

Multiscale structure analysis of the yeast nuclear pore complex has been performed to understand its overall architecture, including the transmembrane ring. This approach integrates data from different resolution scales to build a comprehensive model of the NPC.

Genetic studies in S. cerevisiae have identified Brl1 and Brr6 as factors that localize to NPC assembly sites and promote biogenesis. Biochemical isolation of a single spoke, the Ndc1 complex, allows detailed analysis of transmembrane ring components.

CRISPR knockout, point mutation, knock-in, and overexpression models can be used to study the function of transmembrane ring components in yeast and vertebrate cells. These models enable causal testing of gene function in NPC assembly and anchorage.

Researchers studying nuclear pore transmembrane ring-related genes often need to determine whether a candidate gene is causally involved in NPC assembly, anchorage, or related disease processes. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.

GO:0070762 (nuclear pore transmembrane ring) is a conserved subcomplex of the nuclear pore complex that spans the nuclear membrane and anchors the NPC to the nuclear envelope. Its components, including Pom152p, Pom34p, Ndc1p in yeast and Gp210, Ndc1, Pom121 in vertebrates, are arranged in 8-fold symmetrical spokes around the central transport channel. Assembly factors such as Brl1 and Brr6 are required for NPC biogenesis. Studying this term provides insights into NPC architecture, nuclear envelope stability, and potential disease mechanisms. EDITGENE offers comprehensive CRISPR services to support research on nuclear pore transmembrane ring-related genes.