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mRNA Export and Nuclear Structures definitions

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  • Nuclear Envelope
    Double lipid bilayer structure surrounding the nucleus, continuous with the endoplasmic reticulum, separating nucleoplasm from cytosol.
  • Nuclear Pore Complex
    Large protein assembly embedded in the nuclear envelope, regulating selective transport between nucleus and cytosol.
  • Nuclear Lamina
    Protein meshwork lining the inner nuclear membrane, providing structural support and maintaining nuclear shape.
  • Nucleolus
    Dense nuclear region where ribosomal RNA genes are transcribed and ribosome assembly begins.
  • Perinuclear Space
    Compartment between the two nuclear envelope membranes, continuous with the endoplasmic reticulum lumen.
  • Nucleoplasm
    Gel-like substance inside the nucleus, containing chromatin and nuclear bodies.
  • Chromatin
    Complex of DNA and proteins organized into specific nuclear regions, not randomly dispersed.
  • Heterochromatin
    Densely packed chromatin regions that anchor chromosomes to the nuclear envelope, maintaining spatial organization.
  • Nuclear Export Signal
    Molecular tag on mRNA recognized by export machinery, ensuring only properly processed transcripts exit the nucleus.
  • MRNP Exporter
    Protein complex that binds nuclear export signals on mRNA, facilitating their passage through nuclear pores.
  • Exosome
    Nuclear complex responsible for degrading improperly processed RNA and introns, ensuring mRNA quality control.
  • Nuclear Localization Signal
    Amino acid sequence on proteins, rich in lysine and arginine, required for nuclear import.
  • Importin
    Transport protein that recognizes nuclear localization signals and mediates protein entry into the nucleus.
  • Ran GTP
    GTP-bound regulatory protein that triggers cargo release from importin inside the nucleus and enables importin recycling.
  • Ran GDP
    GDP-bound form of Ran, generated in the cytosol, allowing importin to dissociate and participate in further import cycles.