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Endoplasmic Reticulum

Endoplasmic Reticulum

Endoplasmic ReticulumThe endoplasmic reticulum (ER) is an extensive network of membranous sacs and tubules in eukaryotic cells, continuous with the outer membrane of the nucleus. This structural continuity integrates nuclear and cytoplasmic processes and facilitates efficient intracellular transport. This allows mRNA to move directly from the nucleus to ribosomes for efficient protein synthesis. As a result, the ER serves as a central site for the synthesis, processing, and distribution of...

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,...

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,...

Directing Proteins to the Rough Endoplasmic Reticulum

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...

Post-translational Translocation of Proteins to the RER

Post-translational Translocation of Proteins to the RER

A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...

Smooth Endoplasmic Reticulum

Smooth Endoplasmic Reticulum

Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
The ER provides optimal conditions for synthesizing steroid hormones and lipids, such as phospholipids and triglycerides. Traditionally, lipid metabolism was considered to be a smooth ER function. However, there is no direct evidence to prove that rough ER is completely excluded from lipid...

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Related Experiment Video

Updated: Jun 20, 2026

Spontaneous Formation and Rearrangement of Artificial Lipid Nanotube Networks as a Bottom-Up Model for Endoplasmic Reticulum

Spontaneous Formation and Rearrangement of Artificial Lipid Nanotube Networks as a Bottom-Up Model for Endoplasmic Reticulum

Published on: January 22, 2019

How and why does the endoplasmic reticulum move?

Becky Bola¹, Viki Allan

¹Faculty of Life Sciences, University of Manchester, The Michael Smith Building, Oxford Road, Manchester, UK.

Biochemical Society Transactions

|September 17, 2009

Summary

This summary is machine-generated.

The endoplasmic reticulum (ER) is a dynamic organelle essential for cellular functions. This review explores how ER movement, influenced by the cytoskeleton, impacts its organization and overall cell health.

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Area of Science:

Cell Biology
Molecular Biology
Cytoskeletal Dynamics

Background:

The endoplasmic reticulum (ER) is a vital organelle involved in protein synthesis, folding, trafficking, calcium homeostasis, and lipid synthesis.
ER structure is dynamic, with adaptable tubular and lamellar regions, and its distribution relies on interactions with the microtubule and actin cytoskeleton.

Purpose of the Study:

To review the mechanisms of endoplasmic reticulum (ER) movement within the cell.
To discuss the functional significance of ER mobility for cellular processes and overall cell health.

Main Methods:

Literature review of existing research on ER dynamics and cytoskeletal interactions.
Analysis of studies investigating the regulation of ER structure and movement.

Main Results:

ER movement is intrinsically linked to cytoskeletal components, particularly microtubules and actin filaments.
The dynamic reorganization of the ER, including changes in tubular and lamellar regions, is crucial for its functions.
ER mobility plays a role in adapting organelle size and distribution according to cellular needs.

Conclusions:

Understanding ER movement is key to comprehending its diverse cellular roles.
Cytoskeletal regulation of ER dynamics is fundamental for maintaining cellular homeostasis and function.
Further research into ER motility can reveal insights into various cellular processes and diseases.