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Related Concept Videos

Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
Nuclear Export01:42

Nuclear Export

The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
Nuclear Protein Sorting01:34

Nuclear Protein Sorting

Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
Signal Sequences and Sorting Receptors01:41

Signal Sequences and Sorting Receptors

Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
The Nucleolus02:55

The Nucleolus

The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...

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Related Experiment Video

Updated: Jun 22, 2026

Heterokaryon Technique for Analysis of Cell Type-specific Localization
09:31

Heterokaryon Technique for Analysis of Cell Type-specific Localization

Published on: March 11, 2011

Nuclear localization signals and human disease.

Laura M McLane1, Anita H Corbett

  • 1Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA.

IUBMB Life
|June 11, 2009
PubMed
Summary

Nuclear transport regulates the movement of macromolecules between the nucleus and cytoplasm via nuclear targeting signals. Understanding these transport mechanisms is crucial, as their deregulation is linked to diseases like cancer.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Eukaryotic cells separate genetic material (nucleus) from translation machinery (cytoplasm) via the nuclear envelope.
  • This separation necessitates mechanisms for macromolecule transport across the nuclear envelope.
  • Nucleocytoplasmic transport involves cargo recognition by transport receptors and translocation through nuclear pores.

Purpose of the Study:

  • To elucidate the mechanisms of nucleocytoplasmic transport.
  • To understand the role of nuclear targeting signals in protein import and export.
  • To highlight the significance of transport regulation in cellular processes and disease.

Main Methods:

  • The study focuses on the recognition of protein cargoes by transport receptors.

More Related Videos

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells
08:53

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells

Published on: May 16, 2017

Related Experiment Videos

Last Updated: Jun 22, 2026

Heterokaryon Technique for Analysis of Cell Type-specific Localization
09:31

Heterokaryon Technique for Analysis of Cell Type-specific Localization

Published on: March 11, 2011

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells
08:53

Assay to Measure Nucleocytoplasmic Transport in Real Time within Motor Neuron-like NSC-34 Cells

Published on: May 16, 2017

  • It examines the role of specific amino acid sequences, termed nuclear targeting signals.
  • The regulation of protein transport in relation to the cell cycle and cell type is considered.

    • Main Results:

    • Protein cargoes are recognized by transport receptors through nuclear targeting signals.
    • Both nuclear import and export are highly regulated processes.
    • Deregulation of nuclear transport is associated with cancers and developmental disorders.

    Conclusions:

    • Nucleocytoplasmic transport is a critical, regulated process in eukaryotic cells.
    • Understanding the interactions between transport receptors and nuclear targeting signals is vital.
    • Dysregulation of these transport mechanisms has significant implications for human health.