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Related Concept Videos

Microtubules01:35

Microtubules

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There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter of about 25 nm, microtubules are the thickest of these fibers. Microtubules carry out a variety of functions that include cell structure and support, transport of organelles, cell motility (movement), and the separation of chromosomes during cell division.
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Microtubules01:18

Microtubules

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Microtubules are the thickest cytoskeletal filaments with a diameter of 25 nm. In prokaryotic organisms, microtubules are commonly found in locomotory appendages like cilia and flagella. In eukaryotic cells, microtubules form specialized extensions for moving fluid over the surface, like those found in cells lining the intestine.
Microtubules have two structurally similar globular protein subunits: α and β tubulins. In the cytosol, the α and β tubulins form a heterodimer....
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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Smooth Endoplasmic Reticulum01:21

Smooth Endoplasmic Reticulum

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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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Structure and Organization of Smooth Muscles01:13

Structure and Organization of Smooth Muscles

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Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
Structure of smooth muscle cell
Smooth muscle cells are spindle-shaped with tapering ends and a...
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Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

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The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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Related Experiment Video

Updated: May 5, 2026

Focal Ca2+ Transient Detection in Smooth Muscle
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Focal Ca2+ Transient Detection in Smooth Muscle

Published on: June 29, 2009

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Rough sheets and smooth tubules.

Yoko Shibata1, Gia K Voeltz, Tom A Rapoport

  • 1Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Cell
|August 12, 2006
PubMed
Summary

The endoplasmic reticulum (ER) forms distinct sheet and tubule structures. Specific proteins likely shape these morphologies, creating functional rough and smooth ER domains.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Structural Biology

Background:

  • The endoplasmic reticulum (ER) exhibits diverse morphologies, including sheets and tubules.
  • These structures are characterized by distinct membrane curvature.
  • The ER's morphology is linked to its functional compartmentalization into rough and smooth domains.

Purpose of the Study:

  • To investigate the role of key proteins in driving ER morphological domain formation.
  • To understand how protein-mediated structures generate distinct functional domains within the ER.

Main Methods:

  • This study focuses on the structural and molecular mechanisms underlying ER morphology.
  • Analysis of protein-lipid interactions and membrane dynamics.

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Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

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Related Experiment Videos

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Main Results:

  • Specific proteins are identified as potential drivers of ER sheet and tubule formation.
  • Evidence suggests a correlation between protein-induced structures and the generation of functional ER domains.

Conclusions:

  • Key proteins play a crucial role in determining the characteristic membrane curvature of ER sheets and tubules.
  • Protein-driven structural organization is fundamental to establishing the functional compartmentalization of the endoplasmic reticulum.