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Laminins are the Adhesive Proteins of Basal Lamina00:55

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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...
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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
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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.
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The Nucleolus02:55

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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The Nuclear Lamina.

Xianrong Wong1, Ashley J Melendez-Perez2, Karen L Reddy2,3

  • 1Laboratory of Developmental and Regenerative Biology, Skin Research Institute of Singapore, Agency for Science, Technology and Research (A∗STAR), Singapore 138648.

Cold Spring Harbor Perspectives in Biology
|August 17, 2021
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Summary
This summary is machine-generated.

Lamins form the nuclear lamina, crucial for cell functions like DNA repair and gene regulation. These proteins interact with many molecules to maintain nuclear structure and control genome organization.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genomics

Background:

  • Lamins are key structural proteins forming the nuclear lamina, a subcompartment within the cell nucleus.
  • The nuclear lamina plays a vital role in diverse cellular processes, including nuclear integrity, DNA replication, and gene expression.

Purpose of the Study:

  • To elucidate the extensive interactions of lamins with nuclear components.
  • To understand the role of lamins in regulating nuclear subcompartments and genome organization.

Main Methods:

  • The study involved analyzing the interactions between lamins and various nuclear proteins, including membrane proteins, transcription factors, and chromatin regulators.
  • Investigated the self-reinforcing interactions between lamins and lamin-associated peptides in the inner nuclear membrane.
  • Examined the direct and indirect interactions of lamins with lamina-associated domains (LADs).

Main Results:

  • Lamins interact with a wide array of nuclear molecules, forming the structural basis of the nuclear lamina.
  • Interactions with lamin-associated peptides are mutually required and reinforce each other.
  • Lamins regulate 3D genome organization and the expression of developmentally controlled genes through interactions with LADs.

Conclusions:

  • Lamins are central organizers of the nuclear lamina, essential for maintaining nuclear integrity and orchestrating cellular functions.
  • The intricate network of interactions involving lamins is critical for dynamic genome organization and gene regulation.