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Related Concept Videos

Laminins are the Adhesive Proteins of Basal Lamina00:55

Laminins are the Adhesive Proteins of Basal Lamina

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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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Nuclear Export01:42

Nuclear Export

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Nuclear Protein Sorting

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Detection of Nuclear Blebbing and DNA Leakage in Mammalian Cells by Immunofluorescence
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The nuclear lamins: flexibility in function.

Brian Burke1, Colin L Stewart

  • 1Institute of Medical Biology, 8A Biomedical Grove, Immunos 06-06, Singapore 138648. Brian.Burke@ imb.a-star.edu.sg

Nature Reviews. Molecular Cell Biology
|December 6, 2012
PubMed
Summary
This summary is machine-generated.

The nuclear lamina, composed of A-type and B-type lamins, provides structural support to the nuclear envelope. While often considered essential, their necessity varies by cell type and developmental stage.

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Area of Science:

  • Cell Biology
  • Structural Biology
  • Genetics

Background:

  • The nuclear lamina is a key structural component of the nuclear envelope.
  • It anchors chromatin and nuclear envelope proteins.
  • Lamins, intermediate filament proteins, include A-type and B-type families.

Purpose of the Study:

  • To explore the essentiality and regulatory roles of nuclear lamins.
  • To investigate the cell- and tissue-specific functions of lamins.
  • To understand the regulation of cellular senescence by B-type lamins.

Main Methods:

  • Review of existing literature on nuclear lamina composition and function.
  • Analysis of developmental regulation of A-type lamins.
  • Examination of B-type lamins' presence and roles across different cell types.

Main Results:

  • B-type lamins are ubiquitously expressed, unlike developmentally regulated A-type lamins.
  • Evidence suggests B-type lamins regulate cellular senescence.
  • Certain cell types and early developmental stages do not require A- or B-type lamins.

Conclusions:

  • Nuclear lamins exhibit complex, context-dependent roles.
  • Their requirement is not universal, varying with cell type and developmental stage.
  • A dynamic network at the nuclear periphery is defined by cell- and tissue-specific interactions.