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Regulation of Nuclear Protein Sorting

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...

Additional Subnuclear Structures

Additional Subnuclear Structures

The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals.
The nucleus contains many membrane-less subnuclear organelles or nuclear bodies, such as nucleoli, Cajal bodies, speckles, paraspeckles, etc. These nuclear...

The Nucleolus

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,...

The Nucleolus

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,...

Nuclear Protein Sorting

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...

The Nucleus

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

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Related Experiment Video

Updated: Jun 23, 2026

A Cell-Free Assay Using Xenopus laevis Embryo Extracts to Study Mechanisms of Nuclear Size Regulation

A Cell-Free Assay Using Xenopus laevis Embryo Extracts to Study Mechanisms of Nuclear Size Regulation

Published on: August 8, 2016

Sizing up the nucleus: nuclear shape, size and nuclear-envelope assembly.

Micah Webster¹, Keren L Witkin, Orna Cohen-Fix

¹The Laboratory of Cellular and Molecular Biology, NIDDK, NIH, Bethesda, MD 20892, USA.

Journal of Cell Science

|May 8, 2009

Summary

Understanding nuclear envelope assembly is key to cell division. This commentary explores nuclear shape, size regulation, and proposes the

Related Experiment Videos

Last Updated: Jun 23, 2026

A Cell-Free Assay Using Xenopus laevis Embryo Extracts to Study Mechanisms of Nuclear Size Regulation

A Cell-Free Assay Using Xenopus laevis Embryo Extracts to Study Mechanisms of Nuclear Size Regulation

Published on: August 8, 2016

Area of Science:

Cell Biology
Molecular Biology
Genetics

Background:

The nucleus, a vital organelle, has poorly understood formation, shape, and size regulation mechanisms.
Nuclear envelope (NE) disassembly and reassembly during the cell cycle are critical for metazoan development and proliferation.

Purpose of the Study:

To summarize current knowledge on nuclear shape and size regulation.
To highlight recent discoveries in NE assembly and its relationship with the endoplasmic reticulum (ER).
To propose a novel hypothesis for single nucleus formation post-mitosis.

Main Methods:

Review of existing literature on nuclear structure and formation.
Analysis of recent findings on NE assembly and ER interactions.
Theoretical modeling based on the 'limited flat membrane hypothesis'.

Main Results:

Recent research provides new insights into NE assembly processes.
The relationship between the NE and ER is increasingly understood.
The 'limited flat membrane hypothesis' is introduced to explain post-mitotic nucleus formation.

Conclusions:

Further research is needed to fully resolve the complexities of nuclear structure.
The 'limited flat membrane hypothesis' offers a potential framework for understanding nucleus formation.
Continued investigation into NE-ER interactions will illuminate nuclear envelope dynamics.