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Related Concept Videos

Extracellular Matrix01:26

Extracellular Matrix

Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
The Extracellular Matrix01:29

The Extracellular Matrix

Overview
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...
The Extracellular Matrix01:42

The Extracellular Matrix

In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.Composition of the Extracellular MatrixThe extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse molecules.
Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
Matrix Proteoglycans and Glycoproteins01:21

Matrix Proteoglycans and Glycoproteins

Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...

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Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment
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Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment

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E. coli Extracellular Matrix: A Tunable Composite With Hierarchical Structure.

Macarena Siri1,2,3,4,5, Agustín Mangiarotti6,7,8, Anne Seewald1

  • 1Max Planck Institute of Colloids and Interfaces, Department of Biomaterials, Potsdam, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|June 24, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals how Escherichia coli (E. coli) biofilms use curli fibers and phosphoethanolamine-modified cellulose (pEtN-cellulose) to create a composite material. Their interactions dictate biofilm structure and mechanical properties, offering insights into bio-sourced materials.

Keywords:
E. colibiofilmcomposite behaviorcryo‐FIBSEMcurlipEtN‐cellulose

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Preparation of Tunable Extracellular Matrix Microenvironments to Evaluate Schwann Cell Phenotype Specification
07:50

Preparation of Tunable Extracellular Matrix Microenvironments to Evaluate Schwann Cell Phenotype Specification

Published on: June 2, 2020

Area of Science:

  • Microbiology
  • Materials Science
  • Biophysics

Background:

  • Escherichia coli (E. coli) biofilms are complex structures with an extracellular matrix (ECM) crucial for their properties.
  • The ECM is primarily composed of curli amyloid fibers and phosphoethanolamine-modified cellulose (pEtN-cellulose), contributing to biofilm rigidity and cohesion, respectively.

Purpose of the Study:

  • To investigate the interplay between curli fibers and pEtN-cellulose in E. coli biofilms.
  • To understand how the composition and organization of these ECM components influence biofilm structure and mechanical properties.

Main Methods:

  • Multiscale analysis of E. coli biofilms with varying curli and pEtN-cellulose ratios.
  • Micro-indentation experiments, confocal microscopy, and cryo-FIBSEM 3D imaging.
  • Spectroscopic analysis of extracted curli and pEtN-cellulose fibers.

Main Results:

  • E. coli biofilms exhibit composite-like mechanical behavior dependent on ECM composition and organization.
  • The biophysical properties of ECM fibers are modulated by their ratio and assembly.
  • pEtN-cellulose swelling is constrained by interactions with rigid curli fibers, forming a hybrid material at the sub-micron scale.

Conclusions:

  • The specific architecture and interactions within the curli/pEtN-cellulose hybrid material explain the emergent properties of E. coli biofilms.
  • Understanding microbial ECM assembly provides a foundation for engineering living materials and utilizing bacterial biofilms for bio-sourced materials.