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Nuclear Localization Signals and Import

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...

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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.
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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...

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Updated: May 10, 2026

Portable Paper-Based Immunoassay Combined with Smartphone Application for Colorimetric and Quantitative Detection of Dengue NS1 Antigen

Portable Paper-Based Immunoassay Combined with Smartphone Application for Colorimetric and Quantitative Detection of Dengue NS1 Antigen

Published on: January 26, 2024

Serotype-specific differences in dengue virus non-structural protein 5 nuclear localization.

Holger Hannemann¹, Po-Yu Sung, Han-Chen Chiu

¹School of Cellular and Molecular Medicine, Faculty of Medical and Veterinary Sciences, University of Bristol, University Walk, Bristol BS8 1TD, United Kingdom.

The Journal of Biological Chemistry

|June 18, 2013

Summary

This summary is machine-generated.

Dengue virus non-structural protein 5 (NS5) shows distinct nuclear localization patterns across its four serotypes. This difference, not linked to nuclear export or IL-8 expression, suggests NS5 nuclear entry has an auxiliary role in specific dengue virus serotype lifecycles.

Keywords:

Dengue Flaviviruses Nuclear Transport Positive Strand RNA Viruses Viral Polymerase Virology

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Area of Science:

Virology
Molecular Biology
Immunology

Background:

Dengue virus (DENV) is a major arthropod-borne viral disease.
DENV non-structural protein 5 (NS5) has crucial enzymatic roles in viral RNA capping and replication within the host cytoplasm.
Previous research indicated DENV-2 NS5 accumulates in the nucleus during infection.

Purpose of the Study:

To investigate the nuclear localization patterns of NS5 across all four DENV serotypes.
To identify the mechanisms underlying differential NS5 nuclear localization.
To determine the functional significance of NS5 nuclear localization in the DENV lifecycle.

Main Methods:

Comparative analysis of NS5 localization for DENV-1, -2, -3, and -4.
Investigation of nuclear export mechanisms using DENV-2 and DENV-4 NS5.
Identification of nuclear localization sequences (NLS) and interactions with importin-α isoforms.
siRNA-mediated knockdown of importin-α and importin-β.
Assessment of IL-8 gene expression levels.

Main Results:

Significant serotypic differences in NS5 nuclear localization were observed: DENV-2 and -3 NS5 accumulated in the nucleus, while DENV-1 and -4 NS5 were primarily cytoplasmic.
The cytoplasmic localization of DENV-4 NS5 was attributed to the absence of a functional NLS, not rapid nuclear export.
Importin-β, but not importin-α isoforms, played a role in DENV-2 NS5 nuclear import.
Serotypic differences in NS5 nuclear localization did not correlate with altered IL-8 gene expression.

Conclusions:

NS5 nuclear localization exhibits serotype-specific variations in dengue virus.
The absence of a functional NLS explains the cytoplasmic retention of DENV-4 NS5.
Nuclear localization of NS5 is not essential for viral replication but likely serves an auxiliary function in specific DENV serotypes.