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#nuclear pore complex

3 public questions tagged with this topic.

The nuclear pore complex (NPC) primarily consists of:

Nuclear pore complexes are massive one hundred ten to one hundred twenty megadalton assemblies spanning two lipid bilayers with eightfold rotational symmetry, comprised of about thirty distinct proteins called nucleoporins organized into scaffold and barrier layers. Y-complex Nup107-Nup160 forms outer rings, Nup93-Nup205 inner ring, and intrinsically disordered FG-repeat nucleoporins such as Nup62 complex, Nup98, Nup214 line central channel forming selective hydrogel that blocks nonspecific diffusion above forty kDa while allowing receptor-mediated transport. Importin beta family receptors bin

Ref: Rout & Aitchison Annu Rev Biochem; NPC 30 nucleoporins FG barrier selective transport.

What is the role of importins in nuclear transport?

Importins act as soluble chaperones that decode nuclear localization signals and ferry cargo through nuclear pore complex while keeping hydrophobic patches shielded. Classical monopartite NLS such as SV40 large T antigen PKKKRKV or bipartite nucleoplasmin KRPAATKKAGQAKKKK are highly enriched in basic lysine and arginine side chains that bind armadillo repeats of importin-alpha via electrostatic interactions and tryptophan-mediated cation-pi stacking. Importin-beta then wraps around importin-alpha IBB domain and mediates transient hydrophobic contacts with FG nucleoporins, moving complex inward

Ref: Lodish et al., Molecular Cell Biology, 9th ed., Chapter 13: Importin Alpha-Beta and NLS Recognition Mechanism.

What is the function of the nuclear pore complex (NPC)?

Barrier between genome and cytoplasm is perforated by nuclear pore complexes large supramolecular structures of approximately 125 megadaltons composed of about 30 distinct nucleoporins present in multiple copies arranged with eightfold rotational symmetry spanning double nuclear membranes. Outer scaffold comprises Y-shaped Nup107-160 subcomplex forming two concentric rings, inner ring composed of Nup205, Nup188, Nup155 anchoring central channel filled with disordered FG repeats rich in phenylalanine-glycine motifs that form selective phase limiting diffusion. Molecules smaller than 40 kilodalt

Ref: Hurt & Beck, Cell 2015, Nuclear Pore Architecture. Alberts 7th ed., Chapter 12, NPC Function.