Macromolecular organization of basement membranes
1Department of Protein Chemistry, Max-Planck-Institut für Biochemie, 82152 Martinsried, Germany. TIMPL@vms.biochem.mpg.de
Current Opinion in Cell Biology
|October 1, 1996
Summary
Recent studies characterize diverse basement membrane components, including laminin isoforms and novel alpha chains. Functional analysis uses recombinant technologies and structural studies, revealing insights into inherited disorders.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Basement membranes are crucial extracellular matrices with diverse protein components.
- Laminins, a major component, exist in multiple isoforms with distinct functions.
- Understanding these components is vital for comprehending tissue structure and disease.
Purpose of the Study:
- To characterize novel basement membrane components, particularly laminin alpha3, alpha4, and alpha5 chains.
- To analyze the functional properties of these components using advanced techniques.
- To gain insights into the roles of basement membrane proteins in inherited disorders.
Main Methods:
- Characterization of over ten laminin isoforms and novel alpha chains.
- Analysis of functional properties via recombinant technologies.
- Structural studies at atomic resolution to elucidate binding epitopes.
- Gene-targeting experiments and analysis of mutated genes.
Main Results:
- Identification and characterization of multiple laminin isoforms and novel alpha chains (alpha3, alpha4, alpha5).
- Elucidation of the nidogen-binding epitope on the laminin gamma1 chain through structural studies.
- Novel insights into basement membrane component functions derived from genetic studies.
Conclusions:
- Advanced techniques are revealing the complexity and function of basement membrane components.
- Understanding these components is critical for research into inherited diseases.
- Future research will likely focus on the precise roles of these diverse proteins in health and disease.
More Related Videos
10:41Confocal and Super-Resolution Imaging of Polarized Intracellular Trafficking and Secretion of Basement Membrane Proteins During Drosophila Oogenesis
Published on: May 19, 2022
07:30Basement Membrane Matrix Encapsulated Cell Aggregation for Investigating Murine Spleen Tissue Formation
Published on: June 28, 2024
Related Concept Videos
01:18Membrane Domains
The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
00:59Mechanisms of Membrane Domain Formation
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
01:03Basal Lamina are the Specialized Form of ECM
The basal lamina is a thin extracellular layer that lies underneath the cells and separates them from other tissues. The three layers of the basal lamina are lamina lucida, lamina densa and lamina reticularis. The basal lamina, a mixture of glycoproteins and collagen, provides an attachment site for the epithelium, separating it from underlying connective tissue. The framework of basal lamina has other essential proteins such as laminins mesh, perlecan, entactin, and type IV collagen.
Proteins...
Proteins...
00:55Laminins are the Adhesive Proteins of Basal Lamina
Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
01:05Type IV Collagen of Basal Lamina
Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can exist in...
A type IV collagen molecule has six alpha chains which can exist in...
01:10Integrins
Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...