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Related Concept Videos

Golgi Matrix Proteins01:12

Golgi Matrix Proteins

Golgi matrix proteins are a group of highly dynamic proteins that maintain the stacked structure of Golgi. These proteins adapt to rapid morphological changes of the Golgi during the cell cycle. During cell division, mild proteolysis removes these connections resulting in Golgi unstacking. In The daughter cells, these proteins help reassemble the unstacked Golgi.
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
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...
Structure of Porins01:21

Structure of Porins

Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel precursors...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...

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A Rapid, Scalable Method for the Isolation, Functional Study, and Analysis of Cell-derived Extracellular Matrix
09:40

A Rapid, Scalable Method for the Isolation, Functional Study, and Analysis of Cell-derived Extracellular Matrix

Published on: January 4, 2017

New insights into peritrophic matrix synthesis, architecture, and function.

Dwayne Hegedus1, Martin Erlandson, Cedric Gillott

  • 1Agriculture and Agri-Food Canada, Saskatoon, SK, S7N 0X2, Canada. hegedusd@agr.gc.ca

Annual Review of Entomology
|December 11, 2008
PubMed
Summary
This summary is machine-generated.

The peritrophic matrix (PM) protects insect midguts as a physical and biochemical barrier. Understanding its structure and function offers new strategies for insect pest management.

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Area of Science:

  • Invertebrate biology
  • Gastrointestinal physiology
  • Biochemistry

Background:

  • The peritrophic matrix (PM) is a vital layer in the invertebrate digestive system.
  • It functions analogously to vertebrate mucous layers, providing protection and aiding digestion.
  • Its composition includes chitin and glycoproteins, forming a protective barrier.

Purpose of the Study:

  • To synthesize current knowledge on the peritrophic matrix (PM).
  • To develop a comprehensive model of the PM's structure and function.
  • To explore potential applications of PM research in pest management.

Main Methods:

  • Literature review integrating structural and functional data.
  • Analysis of the PM's composition (chitin, glycoproteins, glycans).
  • Examination of the PM's role as a physical and biochemical barrier.

Main Results:

  • The PM acts as a physical barrier against abrasive food, enzymes, and pathogens.
  • It functions as a biochemical barrier, sequestering and inactivating toxins.
  • The PM's structure, a chitin-glycoprotein lattice, creates a molecular sieve influenced by pH and ions.

Conclusions:

  • A holistic model of the peritrophic matrix (PM) has been developed.
  • The PM's properties are crucial for efficient digestion and nutrient absorption.
  • PM research presents opportunities for innovative insect pest management technologies.