| Lipoprotein lipase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC no. | 3.1.1.34 | ||||||||
| CAS no. | 9004-02-8 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
Lipoprotein lipase (LPL) (EC 3.1.1.34, systematic name triacylglycerol acylhydrolase (lipoprotein-dependent)) is a member of the lipase gene family, which includes pancreatic lipase, hepatic lipase, and endothelial lipase. It is a water-soluble enzyme that hydrolyzes triglycerides in lipoproteins, such as those found in chylomicrons and very low-density lipoproteins (VLDL), into two free fatty acids and one monoacylglycerol molecule:
- triacylglycerol + H2O = diacylglycerol + a carboxylate
It is also involved in promoting the cellular uptake of chylomicron remnants, cholesterol-rich lipoproteins, and free fatty acids.[5][6][7] LPL requires ApoC-II as a cofactor.[8][9]
LPL is attached to the luminal surface of endothelial cells in capillaries by the protein glycosylphosphatidylinositol HDL-binding protein 1 (GPIHBP1) and by heparan sulfated peptidoglycans.[10] It is most widely distributed in adipose, heart, and skeletal muscle tissue, as well as in lactating mammary glands.[11][12][13]
Synthesis
[edit]In brief, LPL is secreted from heart, muscle and adipose parenchymal cells as a glycosylated homodimer, after which it is translocated through the extracellular matrix and across endothelial cells to the capillary lumen. After translation, the newly synthesized protein is glycosylated in the endoplasmic reticulum. The glycosylation sites of LPL are Asn-43, Asn-257, and Asn-359.[5] Glucosidases then remove terminal glucose residues; it was once believed that this glucose trimming is responsible for the conformational change needed for LPL to form homodimers and become catalytically active.[5][13][14][15] In the Golgi apparatus, the oligosaccharides are further altered to result in either two complex chains, or two complex and one high-mannose chain.[5][13] In the final protein, carbohydrates account for about 12% of the molecular mass (55-58 kDa).[5][13][16]
Homodimerization is required before LPL can be secreted from cells.[16][17] After secretion, LPL is carried across endothelial cells and presented into the capillary lumen by the protein glycosylphosphatidylinositol-anchored high-density lipoprotein-binding protein 1.[18][19]
Structure
[edit]Crystal structures of LPL complexed with GPIHBP1 have been reported.[20][21] LPL is composed of two distinct regions: the larger N-terminus domain that contains the lipolytic active site, and the smaller C-terminus domain. These two regions are attached by a peptide linker. The N-terminus domain has an α/β hydrolase fold, which is a globular structure containing a central β sheet surrounded by α helices. The C-terminus domain is a β sandwich formed by two β sheet layers, and resembles an elongated cylinder.
Mechanism
[edit]
The active site of LPL is composed of the conserved Ser-132, Asp-156, and His-241 triad. Other important regions of the N-terminal domain for catalysis includes an oxyanion hole (Trp-55, Leu-133), a lid region (residues 216-239), as well as a β5 loop (residues 54-64).[5][11][15] The ApoC-II binding site is currently unknown, but it is predicted that residues on both N-and C-terminal domains are necessary for this interaction to occur. The C-terminal domain appears to confer LPL’s substrate specificity; it has a higher affinity for large triacylglyceride-rich lipoproteins than cholesterol-rich lipoproteins.[22] The C-terminal domain is also important for binding to LDL’s receptors.[23] Both the N-and C-terminal domains contain heparin binding sites distal to the lipid binding sites; LPL therefore serves as a bridge between the cell surface and lipoproteins. Importantly, LPL binding to the cell surface or receptors is not dependent on its catalytic activity.[24]
The LPL non-covalent homodimer has a head-to-tail arrangement of the monomers. The Ser/Asp/His triad is in a hydrophobic groove that is blocked from solvent by the lid.[5][11] Upon binding to ApoC-II and lipid in the lipoprotein, the C-terminal domain presents the lipid substrate to the lid region. The lipid interacts with both the lid region and the hydrophobic groove at the active site; this causes the lid to move, providing access to the active site. The β5 loop folds back into the protein core, bringing one of the electrophiles of the oxyanion hole into position for lipolysis.[5] The glycerol backbone of the lipid is then able to enter the active site and is hydrolyzed.
Two molecules of ApoC-II can attach to each LPL dimer.[25] It is estimated that up to forty LPL dimers may act simultaneously on a single lipoprotein.[5] In regard to kinetics, it is believed that release of product into circulation is the rate-limiting step in the reaction.[11]
Function
[edit]LPL gene encodes lipoprotein lipase, which is expressed in the heart, muscle, and adipose tissue.[26][27] LPL functions as a homodimer, and has the dual functions of triglyceride hydrolase and ligand/bridging factor for receptor-mediated lipoprotein uptake. Through catalysis, VLDL is converted to IDL and then to LDL. Severe mutations that cause LPL deficiency result in type I hyperlipoproteinemia, while less extreme mutations in LPL are linked to many disorders of lipoprotein metabolism.[28]
Regulation
[edit]LPL is controlled transcriptionally and posttranscriptionally.[29] The circadian clock may be important in the control of Lpl mRNA levels in peripheral tissues.[30]
LPL isozymes are regulated differently depending on the tissue. For example, insulin is known to activate LPL in adipocytes and its placement in the capillary endothelium. By contrast, insulin has been shown to decrease expression of muscle LPL.[31] Muscle and myocardial LPL is instead activated by glucagon and adrenaline. This helps to explain why during fasting, LPL activity increases in muscle tissue and decreases in adipose tissue, whereas after a meal, the opposite occurs.[5][13]
Consistent with this, dietary macronutrients differentially affect adipose and muscle LPL activity. After 16 days on a high-carbohydrate or a high-fat diet, LPL activity increased significantly in both tissues 6 hours after a meal of either composition, but there was a significantly greater rise in adipose tissue LPL in response to the high-carbohydrate diet compared to the high-fat diet. There was no difference between the two diets' effects on insulin sensitivity or fasting LPL activity in either tissue.[32]
The concentration of LPL displayed on endothelial cell surface cannot be regulated by endothelial cells, as they neither synthesize nor degrade LPL. Instead, this regulation occurs by managing the flux of LPL arriving at the lipolytic site and by regulating the activity of LPL present on the endothelium. A key protein involved in controlling the activity of LPL is ANGPTL4, which serves as a local inhibitor of LPL. Induction of ANGPTL4 accounts for the inhibition of LPL activity in white adipose tissue during fasting. Growing evidence implicates ANGPTL4 in the physiological regulation of LPL activity in a variety of tissues.[33]
An ANGPTL3-4-8 model was proposed to explain the variations of LPL activity during the fed-fast cycle.[34] Specifically, feeding induces ANGPTL8, activating the ANGPTL8–ANGPTL3 pathway, which inhibits LPL in cardiac and skeletal muscles, thereby making circulating triglycerides available for uptake by white adipose tissue, in which LPL activity is elevated owing to diminished ANGPTL4; the reverse is true during fasting, which suppresses ANGPTL8 but induces ANGPTL4, thereby directing triglycerides to muscles. The model suggests a general framework for how triglyceride trafficking is regulated.[34]
Clinical significance
[edit]Lipoprotein lipase deficiency leads to hypertriglyceridemia (elevated levels of triglycerides in the bloodstream).[35] In mice, overexpression of LPL has been shown to cause insulin resistance,[36][37] and to promote obesity.[30]
A high adipose tissue LPL response to a high-carbohydrate diet may predispose toward fat gain. One study reported that subjects gained more body fat over the next four years if, after following a high-carbohydrate diet and partaking of a high-carbohydrate meal, they responded with an increase in adipose tissue LPL activity per adipocyte, or a decrease in skeletal muscle LPL activity per gram of tissue.[38]
LPL expression has been shown to be a prognostic predictor in Chronic lymphocytic leukemia.[39] In this haematological disorder, LPL appears to provide fatty acids as an energy source to malignant cells.[40] Thus, elevated levels of LPL mRNA or protein are considered to be indicators of poor prognosis.[41][42][43][44][45][46][47][48][49][50]
Interactions
[edit]Lipoprotein lipase has been shown to interact with LRP1.[51][52][53] It is also a ligand for α2M, GP330, and VLDL receptors.[23] LPL has been shown to be a ligand for LRP2, albeit at a lower affinity than for other receptors; however, most of the LPL-dependent VLDL degradation can be attributed to the LRP2 pathway.[23] In each case, LPL serves as a bridge between receptor and lipoprotein. While LPL is activated by ApoC-II, it is inhibited by ApoCIII.[11]
In other organisms
[edit]The LPL gene is highly conserved across vertebrates. Lipoprotein lipase is involved in lipid transport in the placentae of live bearing lizards (Pseudemoia entrecasteauxii).[54]
Interactive pathway map
[edit]Click on genes, proteins and metabolites below to link to respective articles. [§ 1]
- ^ The interactive pathway map can be edited at WikiPathways: "Statin_Pathway_WP430".
References
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- ^ Williams SE, Inoue I, Tran H, Fry GL, Pladet MW, Iverius PH, Lalouel JM, Chappell DA, Strickland DK (March 1994). "The carboxyl-terminal domain of lipoprotein lipase binds to the low density lipoprotein receptor-related protein/alpha 2-macroglobulin receptor (LRP) and mediates binding of normal very low density lipoproteins to LRP". J. Biol. Chem. 269 (12): 8653–8. doi:10.1016/S0021-9258(17)37017-5. PMID 7510694.
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Further reading
[edit]- Zechner R (1997). "The tissue-specific expression of lipoprotein lipase: implications for energy and lipoprotein metabolism". Curr. Opin. Lipidol. 8 (2): 77–88. doi:10.1097/00041433-199704000-00005. PMID 9183545.
- Fisher RM, Humphries SE, Talmud PJ (1998). "Common variation in the lipoprotein lipase gene: effects on plasma lipids and risk of atherosclerosis". Atherosclerosis. 135 (2): 145–59. doi:10.1016/S0021-9150(97)00199-8. PMID 9430364.
- Beisiegel U (1998). "Lipoprotein metabolism". Eur. Heart J. 19 Suppl A: A20–3. doi:10.1093/eurheartj/19.Abstract_Supplement.1. hdl:20.500.11820/f1238768-8077-44c8-a7f0-72d0d4b9c819. PMID 9519338.
- Pentikäinen MO, Oksjoki R, Oörni K, Kovanen PT (2002). "Lipoprotein lipase in the arterial wall: linking LDL to the arterial extracellular matrix and much more". Arterioscler. Thromb. Vasc. Biol. 22 (2): 211–7. doi:10.1161/hq0102.101551. PMID 11834518.
- Lichtenstein L, Berbée JF, van Dijk SJ, van Dijk KW, Bensadoun A, Kema IP, Voshol PJ, Müller M, Rensen PC, Kersten S (November 2007). "Angptl4 upregulates cholesterol synthesis in liver via inhibition of LPL- and HL-dependent hepatic cholesterol uptake". Arterioscler. Thromb. Vasc. Biol. 27 (11): 2420–7. doi:10.1161/ATVBAHA.107.151894. PMID 17761937.
- Lichtenstein L, Mattijssen F, de Wit NJ, Georgiadi A, Hooiveld GJ, van der Meer R, He Y, Qi L, Köster A, Tamsma JT, Tan NS, Müller M, Kersten S (December 2010). "Angptl4 protects against severe proinflammatory effects of saturated fat by inhibiting fatty acid uptake into mesenteric lymph node macrophages". Cell Metab. 12 (6): 580–92. doi:10.1016/j.cmet.2010.11.002. PMC 3387545. PMID 21109191.
External links
[edit]- GeneReviews/NCBI/NIH/UW entry on Familial Lipoprotein Lipase Deficiency
- Gene therapy for lipoprotein lipase deficiency
- Lipoprotein+lipase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
Lipids: lipoprotein particle metabolism | ||
|---|---|---|
| Lipoprotein particle classes and subclasses |
|  |
| Apolipoproteins | ||
| Extracellular enzymes | ||
| Lipid transfer proteins | ||
| Cell surface receptors | ||
| ATP-binding cassette transporter | ||
