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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...

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...

The Endoplasmic Reticulum

The Endoplasmic Reticulum

The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...

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...

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...

Subcellular Fractionation

Subcellular Fractionation

The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
Differential centrifugation is...

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Related Experiment Video

Updated: Jul 16, 2026

Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates

Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates

Published on: February 27, 2016

The SIRT Family: Subcellular Localization and Main Functions.

Ping Quan¹, Christoph Schatz², Daria Maria Filippini³

¹Independent Researcher, 8605 Kapfenberg, Austria.

International Journal of Molecular Sciences

|July 15, 2026

Summary

Mammalian sirtuins (SIRTs) are enzymes crucial for cellular processes. This review explores their roles in various sarcomas and their potential as therapeutic targets.

Keywords:

expression prognosis indicator sarcoma sirtuin (SIRT)

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Enriching Subcellular Proteins in Leptospira Using a Triton X-114-Based Fractionation Approach

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Published on: August 8, 2025

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Last Updated: Jul 16, 2026

Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates

Deacetylation Assays to Unravel the Interplay between Sirtuins (SIRT2) and Specific Protein-substrates

Published on: February 27, 2016

Enriching Subcellular Proteins in Leptospira Using a Triton X-114-Based Fractionation Approach

Enriching Subcellular Proteins in Leptospira Using a Triton X-114-Based Fractionation Approach

Published on: August 8, 2025

Area of Science:

Biochemistry and Molecular Biology
Oncology
Genetics

Background:

Mammalian sirtuins (SIRTs) are NAD+-dependent histone deacetylases (HDACs) involved in regulating vital biological processes.
SIRTs link cellular metabolism to tissue homeostasis and are implicated in diseases like cancer, particularly sarcomas.
SIRT1 is the most studied sirtuin family member.

Purpose of the Study:

To review the expression and roles of sirtuins (SIRTs), with a focus on SIRT1, in human sarcomas.
To examine the involvement of SIRTs in both bone and soft tissue sarcomas.
To discuss the clinical relevance and therapeutic potential of modulating SIRTs in sarcoma treatment.

Main Methods:

Literature review of studies on sirtuin expression and function in sarcomas.
Analysis of the roles of SIRT1 and other SIRTs in various sarcoma subtypes.
Evaluation of current research on the clinical significance and therapeutic strategies targeting SIRTs in sarcomas.

Main Results:

Sirtuins are expressed in various human sarcomas, influencing key biological processes.
SIRT1 plays a significant role in the development and progression of different sarcoma types.
Dysregulation of SIRTs is observed in sarcomas, highlighting their clinical relevance.

Conclusions:

Sirtuins, particularly SIRT1, are important in sarcoma biology.
Modulating sirtuin activity presents a promising therapeutic avenue for sarcoma treatment.
Further research into SIRTs could lead to novel sarcoma therapies.