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Related Concept Videos

Caspases01:24

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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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...
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
Apoptosis01:30

Apoptosis

Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
Microtubule Associated Proteins (MAPs)01:42

Microtubule Associated Proteins (MAPs)

Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...

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Visualization of Inflammatory Caspases Induced Proximity in Human Monocyte-Derived Macrophages
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Metacaspases.

L Tsiatsiani1, F Van Breusegem, P Gallois

  • 1Department of Plant Systems Biology, VIB, Ghent, Belgium.

Cell Death and Differentiation
|May 21, 2011
PubMed
Summary
This summary is machine-generated.

Metacaspases, essential proteases in non-metazoan organisms, regulate cell death, stress, and proliferation. This review clarifies their functions and provides suitable probes, distinguishing them from metazoan caspases.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Metacaspases are cysteine-dependent proteases in protozoa, fungi, and plants, distantly related to metazoan caspases.
  • Unlike caspases, metacaspases lack Asp specificity and cleave after Arg or Lys residues.
  • Recent studies highlight metacaspases' essential roles in non-metazoan physiology.

Purpose of the Study:

  • To provide a comprehensive overview of metacaspase function and molecular regulation.
  • To analyze the first identified metacaspase-mediated proteolytic pathway.
  • To offer a list of suitable probes for metacaspase research, preventing misapplication of caspase probes.

Main Methods:

  • Literature review and analysis of existing research on metacaspases.
  • Comparative analysis of metacaspase and caspase structures and specificities.
  • Identification and compilation of validated metacaspase-specific molecular probes.

Main Results:

  • Metacaspases are multifunctional proteases crucial for programmed cell death, stress responses, and cell proliferation in non-metazoan organisms.
  • A novel metacaspase-mediated proteolytic pathway has been elucidated.
  • A curated list of molecular probes specifically designed for metacaspase activity is presented.

Conclusions:

  • Metacaspases play vital, diverse roles in cellular processes across non-metazoan kingdoms.
  • Understanding metacaspase function is critical for distinguishing their roles from those of caspases.
  • Accurate molecular tools are essential for advancing metacaspase research.