NLN | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Aliases | NLN , AGTBP, EP24.16, MEP, MOP, neurolysin | ||||||||||||||||||||||||||||||||||||||||||||||||||
External IDs | OMIM: 611530 MGI: 1923055 HomoloGene: 69315 GeneCards: NLN | ||||||||||||||||||||||||||||||||||||||||||||||||||
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Neurolysin, mitochondrial is a protein that in humans is encoded by the NLN gene. [5] [6] It is a 78-kDa enzyme, widely distributed in mammalian tissues and found in various subcellular locations that vary with cell type. [7] Neurolysin exemplifies the ability of neuropeptidases to target various cleavage site sequences by hydrolyzing them in vitro, [8] [9] and metabolism of neurotensin is the most important role of neurolysin in vivo. [10] Neurolysin has also been implicated in pain control, [11] [12] [13] blood pressure regulation, [14] [15] sepsis, [16] reproduction, [17] [18] cancer biology [19] pathogenesis of stroke, [20] and glucose metabolism. [21]
The NLN gene lies on the chromosome location of 5q12.3 and consists of 14 exons.
Neurolysin, with 704 amino acid residues, is a zinc metalloendopeptidase with a conserved HEXXH motif. It has an overall prolate ellipsoid shape, with a deep narrow channel dividing it into two roughly equal domains. [22] The catalytic site is contained within a thermolysin-like region found in many metallopeptidases and located in the domain near the floor of the channel. [10] [23]
Neurolysin hydrolyzes only peptides containing 5-17 amino acids by cleaving at a limited set of sites. [22] [24] [25] The specificity of neurolysin for small bioactive peptides is due to the presence of large structural elements erected over its active site region that allow substrates access only through a deep narrow channel. [26] In vitro, neurolysin exemplifies the ability of some neuropeptidases to target diverse cleavage site sequences. [8] [9] In vivo, their most established role is cleaving neurotensin between its 10th and 11th residues to produce inactive fragments and it has been recently identified as a non-AT1-non-AT2 angiotensin-binding site, with function pertaining to the rennin-angiotensin system. [10] [27] [28] Neurotensin is involved in many processes including mast cell degranulation and regulation of central nervous system dopaminergic and cholinergic circuits. [29] [30] [31] A lower level of neurotensin is associated with schizophrenia, [32] and it is implicated in cardiovascular disorders, addiction, Huntington disease and Parkinson disease. [30] [33] [34] [35] Neurotensin is also one of the most potent blockers of pain perception. [36]
Metabolism of neurotensin is the most important role of neurolysin in vivo and has been identified as a non-AT1-non-AT2 angiotensin-binding site. [10] [27] [28] Neurotensin is involved in many processes including mast cell degranullation and regulation of central nervous system dopaminergic and cholinergic circuits. [29] [30] [31] Neurolysin has also been implicated in pain control, [11] [12] [13] blood pressure regulation, [14] [15] sepsis, [16] reproduction, [17] [18] cancer biology, [19] pathogenesis of stroke, [20] and glucose metabolism. [21] Inhibition of neurolysin has been shown to produce neurotensin-induced analgesia in mice, [37] and control of neurotensin levels by neurolysin may serve as a potential target for antipsychotic therapies.
This protein is known to interact with:
Angiotensin is a peptide hormone that causes vasoconstriction and an increase in blood pressure. It is part of the renin–angiotensin system, which regulates blood pressure. Angiotensin also stimulates the release of aldosterone from the adrenal cortex to promote sodium retention by the kidneys.
Angiotensin-converting enzyme, or ACE, is a central component of the renin–angiotensin system (RAS), which controls blood pressure by regulating the volume of fluids in the body. It converts the hormone angiotensin I to the active vasoconstrictor angiotensin II. Therefore, ACE indirectly increases blood pressure by causing blood vessels to constrict. ACE inhibitors are widely used as pharmaceutical drugs for treatment of cardiovascular diseases.
The angiotensin II receptors, (ATR1) and (ATR2), are a class of G protein-coupled receptors with angiotensin II as their ligands. They are important in the renin–angiotensin system: they are responsible for the signal transduction of the vasoconstricting stimulus of the main effector hormone, angiotensin II.
Angiotensin II receptor blockers (ARBs), formally angiotensin II receptor type 1 (AT1) antagonists, also known as angiotensin receptor blockers, angiotensin II receptor antagonists, or AT1 receptor antagonists, are a group of pharmaceuticals that bind to and inhibit the angiotensin II receptor type 1 (AT1) and thereby block the arteriolar contraction and sodium retention effects of renin–angiotensin system.
Enteroendocrine cells are specialized cells of the gastrointestinal tract and pancreas with endocrine function. They produce gastrointestinal hormones or peptides in response to various stimuli and release them into the bloodstream for systemic effect, diffuse them as local messengers, or transmit them to the enteric nervous system to activate nervous responses. Enteroendocrine cells of the intestine are the most numerous endocrine cells of the body. They constitute an enteric endocrine system as a subset of the endocrine system just as the enteric nervous system is a subset of the nervous system. In a sense they are known to act as chemoreceptors, initiating digestive actions and detecting harmful substances and initiating protective responses. Enteroendocrine cells are located in the stomach, in the intestine and in the pancreas. Microbiota play key roles in the intestinal immune and metabolic responses in these enteroendocrine cells via their fermentation product, acetate.
Prolyl endopeptidase (PE) also known as prolyl oligopeptidase or post-proline cleaving enzyme is an enzyme that in humans is encoded by the PREP gene.
Neprilysin, also known as membrane metallo-endopeptidase (MME), neutral endopeptidase (NEP), cluster of differentiation 10 (CD10), and common acute lymphoblastic leukemia antigen (CALLA) is an enzyme that in humans is encoded by the MME gene. Neprilysin is a zinc-dependent metalloprotease that cleaves peptides at the amino side of hydrophobic residues and inactivates several peptide hormones including glucagon, enkephalins, substance P, neurotensin, oxytocin, and bradykinin. It also degrades the amyloid beta peptide whose abnormal folding and aggregation in neural tissue has been implicated as a cause of Alzheimer's disease. Synthesized as a membrane-bound protein, the neprilysin ectodomain is released into the extracellular domain after it has been transported from the Golgi apparatus to the cell surface.
Angiotensin II receptor type 2, also known as the AT2 receptor is a protein that in humans is encoded by the AGTR2 gene.
Neurotensin receptor type 1 is a protein that in humans is encoded by the NTSR1 gene. For a crystal structure of NTS1, see pdb code 4GRV. In addition, high-resolution crystal structures have been determined in complex with the peptide full agonist NTS8-13, the non-peptide full agonist SRI-9829, the partial agonist RTI-3a, and the antagonists / inverse agonists SR48692 and SR142948A, as well as in the ligand-free apo state., see PDB codes 6YVR (NTSR1-H4X:NTS8–13), 6Z4V (NTSR1-H4bmX:NTS8–13), 6Z8N (NTSR1-H4X:SRI-9829), 6ZA8 (NTSR1-H4X:RTI-3a), 6Z4S (NTSR1-H4bmX:SR48692), 6ZIN (NTSR1-H4X:SR48692), 6Z4Q, and 6Z66.
Thimet oligopeptidase is an enzyme that in humans is encoded by the THOP1 gene.
Meprin A subunit alpha also known as endopeptidase-2 or PABA peptide hydrolase is the alpha subunit of the meprin A enzyme that in humans is encoded by the MEP1A gene. The MEP1A locus is on chromosome 6p in humans and on chromosome 17 in mice.
Carboxypeptidase A3 (mast cell carboxypeptidase A), also known as CPA3, is an enzyme which in humans is encoded by the CPA3 gene. The "CPA3" gene expression has only been detected in mast cells and mast-cell-like lines, and CPA3 is located in secretory granules. CPA3 is one of 8-9 members of the A/B subfamily that includes the well-studied pancreatic enzymes carboxypeptidase A1 (CPA1), carboxypeptidase A2 (CPA2), and carboxypeptidase B. This subfamily includes 6 carboxypeptidase A-like enzymes, numbered 1-6. The enzyme now called CPA3 was originally named mast cell carboxypeptidase A, and another protein was initially called CPA3. A gene nomenclature committee renamed mast cell carboxypeptidase A as CPA3, and the original CPA3 reported by Huang et al. became CPA4 to reflect the order of their discovery.
Hemopressin (Hp) is an alpha hemoglobin fragment with the sequence PVNFKFLSH, originally identified in extracts of rat brain using an enzyme capture technique. It binds cannabinoid receptors, acting as an inverse agonist at CB1 receptors. Longer forms of hemopressin containing 2-3 additional amino acids on the N-terminus have been identified in extracts of mouse brain. These longer hemopressin peptides, named RVD-Hpα and VD-Hpα, bind to CB1 receptors and were originally reported to be agonists. In addition to the Hp peptides from alpha hemoglobin, a related peptide from beta hemoglobin has been found in mouse brain extracts; this peptide, named VD-Hpβ, is also an agonist at CB1 cannabinoid receptors. Hemopressin is not an endogenous peptide but rather an extraction artefact. The only endogenous peptide found endogenously at physiological conditions is RVD-hemopressin (pepcan-12), which has more recently been shown to be a negative allosteric modulator of CB1 receptors and positive allosteric modulator of CB2 receptors. RVD-hemopressin (pepcan-12) is generated from a pro-peptide called pepcan-23 and these peptides are exclusively found in noradrenergic neurons in the brain and in the adrenal medulla.
Ecadotril is a neutral endopeptidase inhibitor ((NEP) EC 3.4.24.11) and determined by the presence of peptidase family M13 as a neutral endopeptidase inhibited by phosphoramidon. Ecadotril is the (S)-enantiomer of racecadotril. NEP-like enzymes include the endothelin-converting enzymes. The peptidase M13 family believed to activate or inactivate oligopeptide (pro)-hormones such as opioid peptides, neprilysin is another member of this group, in the case of the metallopeptidases and aspartic, the nucleophiles clan or family for example MA, is an activated water molecule. The peptidase domain for members of this family also contains a bacterial member and resembles that of thermolysin the predicted active site residues for members of this family and thermolysin occur in the motif HEXXH. Thermolysin complexed with the inhibitor (S)-thiorphan are isomeric thiol-containing inhibitors of endopeptidase EC 24-11 (also called "enkephalinase").
An Oligopeptidase is an enzyme that cleaves peptides but not proteins. This property is due to its structure: the active site of this enzyme is located at the end of a narrow cavity which can only be reached by peptides.
Sacubitril/valsartan, sold under the brand name Entresto, is a fixed-dose combination medication for use in heart failure. It consists of the neprilysin inhibitor sacubitril and the angiotensin receptor blocker valsartan. The combination is sometimes described as an "angiotensin receptor-neprilysin inhibitor" (ARNi). In 2016, the American College of Cardiology/American Heart Association Task Force recommended it as a replacement for an ACE inhibitor or an angiotensin receptor blocker in people with heart failure with reduced ejection fraction.
Neurolysin is an enzyme. This enzyme catalyses the following chemical reaction
Oligopeptidase A is an enzyme. This enzyme catalyses the following chemical reaction
Thimet oligopeptidases, also known as TOPs, are a type of M3 metallopeptidases. These enzymes can be found in animals and plants, showing distinctive functions. In animals and humans, they are involved in the degradation of peptides, such as bradykinin, neurotensin, angiotensin I, and Aβ peptide, helping to regulate physiological processes. In plants, their role is related to the degradation of targeting peptides and the immune response to pathogens through Salicylic Acid (SA)-dependent stress signaling. In Arabidopsis thaliana—recognized as a model plant for scientific studies—two thimet oligopeptidases, known as TOP1 and TOP2, have been identified as targets for salicylic acid binding in the plant. These TOP enzymes are key components to understand the SA-mediated signaling where interactions exist with different components and most of the pathways are unknown.
Angiotensin (1-7) is an active heptapeptide of the renin–angiotensin system (RAS).