Caspase 3

Last updated
CASP3
1rhj.jpg
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases CASP3 , CPP32, CPP32B, SCA-1, caspase 3
External IDs OMIM: 600636; MGI: 107739; HomoloGene: 37912; GeneCards: CASP3; OMA:CASP3 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

836

12367

Ensembl

ENSG00000164305

ENSMUSG00000031628

UniProt

P42574

P70677

RefSeq (mRNA)

NM_004346
NM_032991

NM_009810
NM_001284409

RefSeq (protein)

NP_001271338
NP_033940

Location (UCSC)n/a Chr 8: 47.07 – 47.09 Mb
PubMed search [2] [3]
Wikidata
View/Edit Human View/Edit Mouse

Caspase-3 is a caspase protein that interacts with caspase-8 and caspase-9. It is encoded by the CASP3 gene. CASP3 orthologs [4] have been identified in numerous mammals for which complete genome data are available. Unique orthologs are also present in birds, lizards, lissamphibians, and teleosts.

The CASP3 protein is a member of the cysteine-aspartic acid protease (caspase) family. [5] Sequential activation of caspases plays a central role in the execution-phase of cell apoptosis. Caspases exist as inactive proenzymes that undergo proteolytic processing at conserved aspartic residues to produce two subunits, large and small, that dimerize to form the active enzyme. This protein cleaves and activates caspases 6 and 7; and the protein itself is processed and activated by caspases 8, 9, and 10. It is the predominant caspase involved in the cleavage of amyloid-beta 4A precursor protein, which is associated with neuronal death in Alzheimer's disease. [6] Alternative splicing of this gene results in two transcript variants that encode the same protein. [7]

Signaling pathway of TNF-R1. Dashed grey lines represent multiple steps TNF signaling.jpg
Signaling pathway of TNF-R1. Dashed grey lines represent multiple steps
Pathways leading to caspase 3 activation. Extrinsic and intrinsic pathways to caspase-3 activation.jpg
Pathways leading to caspase 3 activation.

Caspase-3 shares many of the typical characteristics common to all currently-known caspases. For example, its active site contains a cysteine residue (Cys-163) and histidine residue (His-121) that stabilize the peptide bond cleavage of a protein sequence to the carboxy-terminal side of an aspartic acid when it is part of a particular 4-amino acid sequence. [9] [10] This specificity allows caspases to be incredibly selective, with a 20,000-fold preference for aspartic acid over glutamic acid. [11] A key feature of caspases in the cell is that they are present as zymogens, termed procaspases, which are inactive until a biochemical change causes their activation. Each procaspase has an N-terminal large subunit of about 20 kDa followed by a smaller subunit of about 10 kDa, called p20 and p10, respectively. [12]

Substrate specificity

Under normal circumstances, caspases recognize tetra-peptide sequences on their substrates and hydrolyze peptide bonds after aspartic acid residues. Caspase 3 and caspase 7 share similar substrate specificity by recognizing tetra-peptide motif Asp-x-x-Asp. [13] The C-terminal Asp is absolutely required while variations at other three positions can be tolerated. [14] Caspase substrate specificity has been widely used in caspase based inhibitor and drug design. [15]

Structure

Caspase-3, in particular, (also known as CPP32/Yama/apopain) [16] [17] [18] is formed from a 32 kDa zymogen that is cleaved into 17 kDa and 12 kDa subunits. When the procaspase is cleaved at a particular residue, the active heterotetramer can then be formed by hydrophobic interactions, causing four anti-parallel beta-sheets from p17 and two from p12 to come together to make a heterodimer, which in turn interacts with another heterodimer to form the full 12-stranded beta-sheet structure surrounded by alpha-helices that is unique to caspases. [12] [19] When the heterodimers align head-to-tail with each other, an active site is positioned at each end of the molecule formed by residues from both participating subunits, though the necessary Cys-163 and His-121 residues are found on the p17 (larger) subunit. [19]

The p12 (pink) and p17 (light blue) subunits of caspase-3 with the beta-sheet structures of each in red and blue, respectively; image generated in Pymol from 1rhm.pdb Caspase 3 subunits.png
The p12 (pink) and p17 (light blue) subunits of caspase-3 with the beta-sheet structures of each in red and blue, respectively; image generated in Pymol from 1rhm.pdb

Mechanism

The catalytic site of caspase-3 involves the thiol group of Cys-163 and the imidazole ring of His-121. His-121 stabilizes the carbonyl group of the key aspartate residue, while Cys-163 attacks to ultimately cleave the peptide bond. Cys-163 and Gly-238 also function to stabilize the tetrahedral transition state of the substrate-enzyme complex through hydrogen bonding. [19] In vitro, caspase-3 has been found to prefer the peptide sequence DEVDG (Asp-Glu-Val-Asp-Gly) with cleavage occurring on the carboxy side of the second aspartic acid residue (between D and G). [11] [19] [20] Caspase-3 is active over a broad pH range that is slightly higher (more basic) than many of the other executioner caspases. This broad range indicates that caspase-3 will be fully active under normal and apoptotic cell conditions. [21]

Cys-285 (yellow) and His-237 (green and dark blue) in the active site of caspase-3, p12 subunit in pink and p17 subunit in light blue; image generated in Pymol from 1rhr.pdb Caspase 3 active site.png
Cys-285 (yellow) and His-237 (green and dark blue) in the active site of caspase-3, p12 subunit in pink and p17 subunit in light blue; image generated in Pymol from 1rhr.pdb

Activation

Caspase-3 is activated in the apoptotic cell both by extrinsic (death ligand) and intrinsic (mitochondrial) pathways. [12] [22] The zymogen feature of caspase-3 is necessary because if unregulated, caspase activity would kill cells indiscriminately. [23] As an executioner caspase, the caspase-3 zymogen has virtually no activity until it is cleaved by an initiator caspase after apoptotic signaling events have occurred. [24] One such signaling event is the introduction of granzyme B, which can activate initiator caspases, into cells targeted for apoptosis by killer T cells. [25] [26] This extrinsic activation then triggers the hallmark caspase cascade characteristic of the apoptotic pathway, in which caspase-3 plays a dominant role. [10] In intrinsic activation, cytochrome c from the mitochondria works in combination with caspase-9, apoptosis-activating factor 1 (Apaf-1), and ATP to process procaspase-3. [20] [26] [27] These molecules are sufficient to activate caspase-3 in vitro, but other regulatory proteins are necessary in vivo. [27] Mangosteen (Garcinia mangostana) extract has been shown to inhibit the activation of caspase 3 in B-amyloid treated human neuronal cells. [28]

Inhibition

One means of caspase inhibition is through the IAP (inhibitor of apoptosis) protein family, which includes c-IAP1, c-IAP2, XIAP, and ML-IAP. [19] XIAP binds and inhibits initiator caspase-9, which is directly involved in the activation of executioner caspase-3. [27] During the caspase cascade, however, caspase-3 functions to inhibit XIAP activity by cleaving caspase-9 at a specific site, preventing XIAP from being able to bind to inhibit caspase-9 activity. [29]

Interactions

Caspase 3 has been shown to interact with:

Biological function

Caspase-3 has been found to be necessary for normal brain development as well as its typical role in apoptosis, where it is responsible for chromatin condensation and DNA fragmentation. [20] Elevated levels of a fragment of Caspase-3, p17, in the bloodstream is a sign of a recent myocardial infarction. [51] It is now being shown that caspase-3 may play a role in embryonic and hematopoietic stem cell differentiation. [52]

See also

Related Research Articles

<span class="mw-page-title-main">Serine protease</span> Class of enzymes

Serine proteases are enzymes that cleave peptide bonds in proteins. Serine serves as the nucleophilic amino acid at the (enzyme's) active site. They are found ubiquitously in both eukaryotes and prokaryotes. Serine proteases fall into two broad categories based on their structure: chymotrypsin-like (trypsin-like) or subtilisin-like.

<span class="mw-page-title-main">Death effector domain</span> InterPro Domain

The death-effector domain (DED) is a protein interaction domain found only in eukaryotes that regulates a variety of cellular signalling pathways. The DED domain is found in inactive procaspases and proteins that regulate caspase activation in the apoptosis cascade such as FAS-associating death domain-containing protein (FADD). FADD recruits procaspase 8 and procaspase 10 into a death induced signaling complex (DISC). This recruitment is mediated by a homotypic interaction between the procaspase DED and a second DED that is death effector domain in an adaptor protein that is directly associated with activated TNF receptors. Complex formation allows proteolytic activation of procaspase into the active caspase form which results in the initiation of apoptosis. Structurally the DED domain are a subclass of protein motif known as the death fold and contains 6 alpha helices, that closely resemble the structure of the Death domain (DD).

<span class="mw-page-title-main">Apoptosome</span> A protein complex involved in the cellular apoptotic process.

The apoptosome is a large quaternary protein structure formed in the process of apoptosis. Its formation is triggered by the release of cytochrome c from the mitochondria in response to an internal (intrinsic) or external (extrinsic) cell death stimulus. Stimuli can vary from DNA damage and viral infection to developmental cues such as those leading to the degradation of a tadpole's tail.

Guy Salvesen is a South African-born biochemist, best known for his work in the field of apoptosis. His research focuses on proteases and their inhibitors in humans, with particular emphasis on the caspases of the apoptotic cell death pathway.

<span class="mw-page-title-main">Caspase-9</span> Enzyme found in humans

Caspase-9 is an enzyme that in humans is encoded by the CASP9 gene. It is an initiator caspase, critical to the apoptotic pathway found in many tissues. Caspase-9 homologs have been identified in all mammals for which they are known to exist, such as Mus musculus and Pan troglodytes.

<span class="mw-page-title-main">Caspase 8</span> Protein found in humans

Caspase-8 is a caspase protein, encoded by the CASP8 gene. It most likely acts upon caspase-3. CASP8 orthologs have been identified in numerous mammals for which complete genome data are available. These unique orthologs are also present in birds.

Inhibitors of apoptosis are a group of proteins that mainly act on the intrinsic pathway that block programmed cell death, which can frequently lead to cancer or other effects for the cell if mutated or improperly regulated. Many of these inhibitors act to block caspases, a family of cysteine proteases that play an integral role in apoptosis. Some of these inhibitors include the Bcl-2 family, viral inhibitor crmA, and IAP's.

<span class="mw-page-title-main">Caspase 2</span> Enzyme found in humans

Caspase 2 also known as CASP2 is an enzyme that, in humans, is encoded by the CASP2 gene. CASP2 orthologs have been identified in nearly all mammals for which complete genome data are available. Unique orthologs are also present in birds, lizards, lissamphibians, and teleosts.

<span class="mw-page-title-main">XIAP</span> Protein-coding gene in the species Homo sapiens

X-linked inhibitor of apoptosis protein (XIAP), also known as inhibitor of apoptosis protein 3 (IAP3) and baculoviral IAP repeat-containing protein 4 (BIRC4), is a protein that stops apoptotic cell death. In humans, this protein (XIAP) is produced by a gene named XIAP gene located on the X chromosome.

<span class="mw-page-title-main">Caspase 7</span> Protein found in humans

Caspase-7, apoptosis-related cysteine peptidase, also known as CASP7, is a human protein encoded by the CASP7 gene. CASP7 orthologs have been identified in nearly all mammals for which complete genome data are available. Unique orthologs are also present in birds, lizards, lissamphibians, and teleosts.

<span class="mw-page-title-main">Caspase 6</span> Enzyme found in humans

Caspase-6 is an enzyme that in humans is encoded by the CASP6 gene. CASP6 orthologs have been identified in numerous mammals for which complete genome data are available. Unique orthologs are also present in birds, lizards, lissamphibians, and teleosts. Caspase-6 has known functions in apoptosis, early immune response and neurodegeneration in Huntington's and Alzheimer's disease.

<span class="mw-page-title-main">Baculoviral IAP repeat-containing protein 3</span> Protein-coding gene in the species Homo sapiens

Baculoviral IAP repeat-containing protein3 is a protein that in humans is encoded by the BIRC3 gene.

<span class="mw-page-title-main">Baculoviral IAP repeat-containing protein 2</span> Protein-coding gene in the species Homo sapiens

Baculoviral IAP repeat-containing protein 2 is a protein that in humans is encoded by the BIRC2 gene.

<span class="mw-page-title-main">Caspase 10</span> Enzyme found in humans

Caspase-10 is an enzyme that, in humans, is encoded by the CASP10 gene.

<span class="mw-page-title-main">Diablo homolog</span> Protein-coding gene in the species Homo sapiens

Diablo homolog (DIABLO) is a mitochondrial protein that in humans is encoded by the DIABLO gene on chromosome 12. DIABLO is also referred to as second mitochondria-derived activator of caspases or SMAC. This protein binds inhibitor of apoptosis proteins (IAPs), thus freeing caspases to activate apoptosis. Due to its proapoptotic function, SMAC is implicated in a broad spectrum of tumors, and small molecule SMAC mimetics have been developed to enhance current cancer treatments.

<span class="mw-page-title-main">APAF1</span> Mammalian protein found in Homo sapiens

Apoptotic protease activating factor 1, also known as APAF1, is a human homolog of C. elegans CED-4 gene.

<span class="mw-page-title-main">Serine protease HTRA2, mitochondrial</span> Enzyme found in humans

Serine protease HTRA2, mitochondrial is an enzyme that in humans is encoded by the HTRA2 gene. This protein is involved in caspase-dependent apoptosis and in Parkinson's disease.

<span class="mw-page-title-main">Caspase-activated DNase</span> Protein found in humans

Caspase-activated DNase (CAD) or DNA fragmentation factor subunit beta is a protein that in humans is encoded by the DFFB gene. It breaks up the DNA during apoptosis and promotes cell differentiation. It is usually an inactive monomer inhibited by ICAD. This is cleaved before dimerization.

<span class="mw-page-title-main">Early 35 kDa protein</span> Anti-apoptotic viral protein

The Early 35 kDa protein, or P35 in short, is a baculoviral protein that inhibits apoptosis in the cells infected by the virus. Although baculoviruses infect only invertebrates in nature, ectopic expression of P35 in vertebrate animals and cells also results in inhibition of apoptosis, thus indicating a universal mechanism. P35 has been shown to be a caspase inhibitor with a very wide spectrum of activity both in regard to inhibited caspase types and to species in which the mechanism is conserved.

<span class="mw-page-title-main">Death regulator Nedd2-like caspase</span> Type of cysteine protease

Death regulator Nedd2-like caspase was firstly identified and characterised in Drosophila in 1999 as a cysteine protease containing an amino-terminal caspase recruitment domain. At first, it was thought of as an effector caspase involved in apoptosis, but subsequent findings have proved that it is, in fact, an initiator caspase with a crucial role in said type of programmed cell death.

References

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  2. ↑ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  3. ↑ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ↑ "OrthoMaM phylogenetic marker: CASP3 coding sequence". Archived from the original on 2016-03-03. Retrieved 2009-12-20.
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