Diacylglycerol lipase

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diacylglycerol lipase α
DAGLα structure, folded with AlphaFold.[1][2][3] Transmembrane domain in marine blue. Catalytic domain in yellow. C-terminal tail in gray. See Structure for details. Click image for higher resolution.
Identifiers
SymbolDAGLA
Alt. symbolsC11orf11
NCBI gene747
HGNC1165
RefSeqNM_006133
UniProtQ9Y4D2
Other data
EC number3.1.1.116
LocusChr. 11 q12.3
Search for
StructuresSwiss-model
DomainsInterPro
diacylglycerol lipase β
DAGLβ structure, folded with AlphaFold.[1][2][3] Transmembrane domain in marine blue. Catalytic domain in yellow. Note missing C-terminal tail. See Structure for details. Click image for higher resolution.
Identifiers
SymbolDAGLB
NCBI gene221955
HGNC28923
RefSeqNM_139179
UniProtQ8NCG7
Other data
EC number3.1.1.116
LocusChr. 7 p22.1
Search for
StructuresSwiss-model
DomainsInterPro

Diacylglycerol lipase, also known as DAG lipase, DAGL, or DGL, is an enzyme that catalyzes the hydrolysis of diacylglycerol, releasing a free fatty acid and monoacylglycerol:[1]

diacylglycerol + H2O ⇌ monoacylglycerol + free fatty acid

DAGL has been studied in multiple domains of life, including bacteria, fungi, plants, insects, and mammals.[4] By searching with BLAST for the previously sequenced microorganism DAGL,[5] Bisogno et al discovered two distinct mammalian isoforms, designated DAGLα (DAGLA) and DAGLβ (DAGLB).[1] Most animal DAGL enzymes cluster into the DAGLα and DAGLβ isoforms.[4]

Mammalian DAGL is a crucial enzyme in the biosynthesis of 2-arachidonoylglycerol (2-AG), the most abundant endocannabinoid in tissues.[1] The endocannabinoid system has been identified to have considerable involvement in the regulation of homeostasis and disease.[6] As a result, much effort has been made toward investigating the mechanisms of action and the therapeutic potential of the system's receptors, endogenous ligands, and enzymes like DAGLα and DAGLβ.[6]

Structure[edit]

While both DAGLα and DAGLβ are extensively homologous (sharing 34% of their sequence[4]), DAGLα (1042 amino acids) is much larger than DAGLβ (672 amino acids) due to the presence of a sizeable C-terminal tail in the former.[1][7]

Both DAGLα and DAGLβ have a transmembrane domain at the N-terminal that starts with a conserved 19 amino acid cytoplasmic sequence followed by four transmembrane helices.[1][7] These transmembrane helices are connected by three short loops, of which the two extracellular loops may be glycosylated.[7]

The catalytic domain of both isoforms is an α/β hydrolase domain which consists of 8 core β sheets that are mutually hydrogen-bonded and variously linked by α helices, β sheets, and loops.[7] The hydrophobic active site presents a highly conserved Serine-Aspartate-Histidine catalytic triad.[7] The serine and aspartate residues of the active site were first identified in DAGLα as Ser-472 and Asp-524, and in DAGLβ as Ser-443 and Asp-495.[1] The histidine residue was later identified in DAGLα as His-650,[8] which aligns with His-639 in DAGLβ.[1]

Between β strands 7 and 8 is a 50-60 residue regulatory loop that is believed to act as a well-positioned "lid" controlling access to the catalytic site.[7] Numerous phosphorylation sites have been identified on this loop as evidence of its regulatory nature.[7]

Mechanism[edit]

Diacylglycerol lipase uses a Serine-Aspartate-Histidine catalytic triad to hydrolyze the ester bond of an acyl chain from diacylglycerol (DAG), generating a monoacylglycerol (MAG), and a free fatty acid.[9][10] This hydrolytic cleavage mechanism for DAGLα and DAGLβ is more selective for the sn-1 position of DAG over the sn-2 position.[1]

Initially, histidine deprotonates serine forming a strong nucleophilic alkoxide, which attacks the carbonyl of the acyl group at the sn-1 position of DAG.[1] A tetrahedral intermediate briefly forms before the instability of the oxyanion collapses the tetrahedral intermediate to re-form the double bond while cleaving the ester bond.[11] The monoacylglycerol product, which in this case is 2-arachidonoylglycerol, is released leaving behind an acyl-enzyme intermediate.[11]

An incoming water molecule is deprotonated, and the hydroxide ion attacks the ester linkage generating a second tetrahedral intermediate.[12] The instability of the negative charge once again collapses the tetrahedral intermediate, this time displacing the serine.[12] The second product (a fatty acid) is released from the catalytic site.

Diacylglycerol lipase mechanism.[10][9] Products are shown in blue. Intermolecular interactions are shown in cyan. Arrow-pushing is shown in red.

Biological function[edit]

DAGLα and DAGLβ have been identified as the enzymes predominantly responsible for the biosynthesis of the endogenous signaling lipid, 2-arachidonoylglycerol (2-AG).[1][13] 2-AG is the most abundant endocannabinoid found in tissues[1] and activates the CB1 and CB2 G-protein-coupled receptors.[6] Endocannabinoid signaling via these receptors is involved in core body temperature control, inflammation, appetite promotion, memory formation, mood and anxiety regulation, pain relief, addiction reward, neuron protection, and more.[10][14]

Studies utilizing DAGL α or β knockout mice show that these enzymes regulate 2-AG production in a tissue-dependent manner.[13][14] DAGLα is prevalent in central nervous tissues where it is primarily responsible for the on-demand production[15] of 2-AG, which is involved in retrograde synaptic suppression, regulation of axonal growth, adult neurogenesis, and neuroinflammation.[13][14][15]

DAGLβ has enriched activity in innate immune cells such as macrophages and microglia enabling regulation of 2-AG and downstream metabolic products (e.g. prostaglandins) important for proinflammatory signaling in neuroinflammation and pain.[16][17][18][19]

Disease relevance[edit]

Diacylglycerol lipase has been identified as a tunable target in the endocannabinoid system.[6] It has been the subject of extensive preclinical research, and many propose that disease states, including inflammatory disease, neurodegeneration, pain, and metabolic disorders may benefit from drug discovery.[6] However currently, the conversion of these preclinical findings into viable approved therapeutics for disease remains elusive.[6]

Inhibiting DAGLα in the gastrointestinal tract has been shown to reduce constipation in mice through a CB1-dependent pathway.[10]

DAGLα inhibition in mice has also been shown to reduce neuroinflammatory response due to the reduction of overall 2-AG, a precursor to the synthesis of proinflammatory prostaglandins. Therefore DAGLα inhibition has been identified as an approach to treating neurodegenerative diseases.[10] Indeed, rat models of Huntington's disease show the neuroprotective nature of DAGLα inhibition.[20]

DAGLα inhibition in mice produced weight loss through a reduction in food intake. Moreover, DAGLα knockout mice have low fasting insulin, triglycerides, and total cholesterol.[10] Thus, DAGLα inhibition may be a novel therapy for treating obesity and metabolic syndrome.[21]

However, DAGLα inhibition has also been associated reduction in neuroplasticity, increased anxiety and depression, seizures, and other neuropsychiatric side effects due to drastic alteration of brain lipids.[15][21]

In vivo experiments show that selectively inhibiting DAGLβ has the potential to be a powerful anti-inflammatory therapy by suppressing the production of the proinflammatory molecules arachidonic acid, prostaglandins, tumor necrosis factor α in macrophages and dendritic cells.[16][17][18] As a consequence, DAGLβ inhibition has been identified as a potential therapy for pathological pain that does not impair immunity.[10][17]

References[edit]

  1. ^ a b c d e f g h i j k l m Bisogno T, Howell F, Williams G, et al. (November 2003). "Cloning of the first sn1-DAG lipases points to the spatial and temporal regulation of endocannabinoid signaling in the brain". J. Cell Biol. 163 (3): 463–8. doi:10.1083/jcb.200305129. PMC 2173631. PMID 14610053.
  2. ^ a b Jumper, John; Evans, Richard; Pritzel, Alexander; Green, Tim; Figurnov, Michael; Ronneberger, Olaf; Tunyasuvunakool, Kathryn; Bates, Russ; Žídek, Augustin; Potapenko, Anna; Bridgland, Alex; Meyer, Clemens; Kohl, Simon A. A.; Ballard, Andrew J.; Cowie, Andrew (2021-07-15). "Highly accurate protein structure prediction with AlphaFold". Nature. 596 (7873): 583–589. Bibcode:2021Natur.596..583J. doi:10.1038/s41586-021-03819-2. ISSN 1476-4687. PMC 8371605. PMID 34265844.
  3. ^ a b Mirdita, Milot; Schütze, Konstantin; Moriwaki, Yoshitaka; Heo, Lim; Ovchinnikov, Sergey; Steinegger, Martin (2022-05-30). "ColabFold: making protein folding accessible to all". Nature Methods. 19 (6): 679–682. doi:10.1038/s41592-022-01488-1. ISSN 1548-7105. PMC 9184281. PMID 35637307.
  4. ^ a b c Yuan, Dongjuan; Wu, Zhongdao; Wang, Yonghua (2016-08-26). "Evolution of the diacylglycerol lipases". Progress in Lipid Research. 64: 85–97. doi:10.1016/j.plipres.2016.08.004. ISSN 1873-2194. PMID 27568643.
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  16. ^ a b Hsu, Ku-Lung; Tsuboi, Katsunori; Adibekian, Alexander; Pugh, Holly; Masuda, Kim; Cravatt, Benjamin F. (2012-10-28). "DAGLβ inhibition perturbs a lipid network involved in macrophage inflammatory responses". Nature Chemical Biology. 8 (12): 999–1007. doi:10.1038/nchembio.1105. ISSN 1552-4469. PMC 3513945. PMID 23103940.
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  20. ^ Valdeolivas, S.; Pazos, M. R.; Bisogno, T.; Piscitelli, F.; Iannotti, F. A.; Allarà, M.; Sagredo, O.; Di Marzo, V.; Fernández-Ruiz, J. (2013-10-17). "The inhibition of 2-arachidonoyl-glycerol (2-AG) biosynthesis, rather than enhancing striatal damage, protects striatal neurons from malonate-induced death: a potential role of cyclooxygenase-2-dependent metabolism of 2-AG". Cell Death & Disease. 4 (10): e862. doi:10.1038/cddis.2013.387. ISSN 2041-4889. PMC 3920947. PMID 24136226.
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External links[edit]

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