Lipase Explained

In biochemistry, lipase refers to a class of enzymes that catalyzes the hydrolysis of fats. Some lipases display broad substrate scope including esters of cholesterol, phospholipids, and of lipid-soluble vitamins[1] and sphingomyelinases;[2] however, these are usually treated separately from "conventional" lipases. Unlike esterases, which function in water, lipases "are activated only when adsorbed to an oil–water interface".[3] Lipases perform essential roles in digestion, transport and processing of dietary lipids in most, if not all, organisms.

Structure and catalytic mechanism

Classically, lipases catalyse the hydrolysis of triglycerides:\begin \text + \ce &\longrightarrow \text + \text \\[4pt] \text + \ce &\longrightarrow \text + \text \\[4pt] \text + \ce &\longrightarrow \text + \text\end

Lipases are serine hydrolases, i.e. they function by transesterification generating an acyl serine intermediate. Most lipases act at a specific position on the glycerol backbone of a lipid substrate (A1, A2 or A3). For example, human pancreatic lipase (HPL), converts triglyceride substrates found in ingested oils to monoglycerides and two fatty acids.

A diverse array of genetically distinct lipase enzymes are found in nature, and they represent several types of protein folds and catalytic mechanisms. However, most are built on an alpha/beta hydrolase fold[4] [5] [6] [7] and employ a chymotrypsin-like hydrolysis mechanism using a catalytic triad consisting of a serine nucleophile, a histidine base, and an acid residue, usually aspartic acid.[8] [9]

Physiological distribution

Lipases are involved in diverse biological processes which range from routine metabolism of dietary triglycerides to cell signaling[10] and inflammation.[11] Thus, some lipase activities are confined to specific compartments within cells while others work in extracellular spaces.

Genes encoding lipases are even present in certain viruses.[13] [14]

Some lipases are expressed and secreted by pathogenic organisms during an infection. In particular, Candida albicans has many lipases, possibly reflecting broad-lipolytic activity, which may contribute to the persistence and virulence of C. albicans in human tissue.[15]

Human lipases

Name Gene Location Description Disorder - BSDL aids in the digestion of fats[16] - Human pancreatic lipase (HPL) is the main enzyme that breaks down dietary fats in the human digestive system.[17] To exhibit optimal enzyme activity in the gut lumen, PL requires another protein, colipase, which is also secreted by the pancreas.[18] - Also referred to as lysosomal acid lipase (LAL or LIPA) or acid cholesteryl ester hydrolase Cholesteryl ester storage disease (CESD) and Wolman disease are both caused by mutations in the gene encoding lysosomal lipase.[19] - Hepatic lipase acts on the remaining lipids carried on lipoproteins in the blood to regenerate LDL (low density lipoprotein). – - or "LIPD" Lipoprotein lipase functions in the blood to act on triacylglycerides carried on VLDL (very low density lipoprotein) so that cells can take up the freed fatty acids. Lipoprotein lipase deficiency is caused by mutations in the gene encoding lipoprotein lipase.[20] [21] - – – - Functions in the infant at a near-neutral pH to aid in the digestion of lipids – - – – - or "PLRP2" – digestive juice– – - or "PLRP1" digestive juicePancreatic lipase related protein 1 is very similar to PLRP2 and PL by amino acid sequence (all three genes probably arose via gene duplication of a single ancestral pancreatic lipase gene). However, PLRP1 is devoid of detectable lipase activity and its function remains unknown, even though it is conserved in other mammals.[22] [23] - - ? Active at gastric pH levels. Optimum pH is about 3.5-6. Secreted by several of the salivary glands (Ebner's glands at the back of the tongue (lingua), the sublingual glands, and the parotid glands) –

Other lipases include,,,,,,,,, and .

Uses

In the commercial sphere, lipases are widely used in laundry detergents. Several thousand tons per year are produced for this role.[3]

Lipases are catalysts for hydrolysis of esters and are useful outside of the cell, a testament to their wide substrate scope and ruggedness. The ester hydrolysis activity of lipases has been well evaluated for the conversion of triglycerides into biofuels or their precursors.[24] [25] [26] [27]

Lipases are chiral, which means that they can be used for the enantioselective hydrolysis prochiral diesters.[28] Several procedures have been reported for applications in the synthesis of fine chemicals.[29] [30] [31]

Lipases are generally animal sourced, but can also be sourced microbially.

Biomedicine

Blood tests for lipase may be used to help investigate and diagnose acute pancreatitis and other disorders of the pancreas.[32] Measured serum lipase values may vary depending on the method of analysis.

Lipase assist in the breakdown of fats in those undergoing pancreatic enzyme replacement therapy (PERT). It is a component in Sollpura (Liprotamase).[33] [34]

See also

References

25. Gulzar, Bio-degradation of hydrocarbons using different bacterial and fungal species. Published in international conference on biotechnology and neurosciences. CUSAT (cochin university of science and technology), 2003

Notes and References

  1. Diaz, B.L. . J. P. Arm. . Phospholipase A(2) . Prostaglandins Leukot Essent Fatty Acids . 69. 87–97. 2003 . 12895591 . 10.1016/S0952-3278(03)00069-3 . 2–3.
  2. Goñi F, Alonso A . Sphingomyelinases: enzymology and membrane activity . FEBS Lett . 531 . 1 . 38–46 . 2002 . 12401200 . 10.1016/S0014-5793(02)03482-8. 2002FEBSL.531...38G .
  3. 10.1016/S0734-9750(01)00086-6. Production, purification, characterization, and applications of lipases. 2001. Sharma. Rohit. Chisti. Yusuf. Banerjee. Uttam Chand. Biotechnology Advances. 19. 8. 627–662. 14550014. 18615547 . 10.1.1.319.7729.
  4. Winkler FK . D'Arcy A . W Hunziker . Structure of human boob pancreatic lipase . Nature. 343 . 6260 . 771–774 . 1990 . 2106079 . 10.1038/343771a0. 1990Natur.343..771W . 37423900 .
  5. Book: Schrag J, Cygler M . Lipases and hydrolase fold . Lipases, Part A: Biotechnology . 284 . 85–107 . 1997. 9379946 . 10.1016/S0076-6879(97)84006-2 . Methods in Enzymology . 978-0-12-182185-2.
  6. Book: Egmond, M. R. . C. J. van Bemmel . Impact of structural information on understanding lipolytic function . Lipases, Part A: Biotechnology . 284 . 119–129 . 1997 . 9379930 . 10.1016/S0076-6879(97)84008-6 . Methods in Enzymology . 978-0-12-182185-2.
  7. Withers-Martinez C . Carriere F . Verger R . Bourgeois D . C Cambillau . A pancreatic lipase with a phospholipase A1 activity: crystal structure of a chimeric pancreatic lipase-related protein 2 from guinea pig. Structure. 4. 11 . 1363–74 . 1996 . 8939760. 10.1016/S0969-2126(96)00143-8. free .
  8. Brady, L. . A. M. Brzozowski . Z. S. Derewenda . E. Dodson . G. Dodson . S. Tolley . J. P. Turkenburg . L. Christiansen . B. Huge-Jensen . L. Norskov . A serine protease triad forms the catalytic centre of a triacylglycerol lipase . Nature . 343 . 6260 . 767–70 . 1990 . 2304552 . 10.1038/343767a0. 1990Natur.343..767B . 4308111 . etal.
  9. Lowe ME . The catalytic site residues and interfacial binding of human pancreatic lipase . J Biol Chem . 267 . 24 . 17069–73 . 1992 . 10.1016/S0021-9258(18)41893-5 . 1512245. free .
  10. Spiegel S . Foster D . R Kolesnick . Signal transduction through lipid second messengers. Current Opinion in Cell Biology. 8. 2 . 159–67 . 1996 . 8791422 . 10.1016/S0955-0674(96)80061-5. free .
  11. Tjoelker LW . Eberhardt C . Unger J . Trong HL . Zimmerman GA . McIntyre TM . Stafforini DM . Prescott SM . PW Gray . Plasma platelet-activating factor acetylhydrolase is a secreted phospholipase A2 with a catalytic triad . J Biol Chem . 270 . 43 . 25481–7 . 1995 . 7592717 . 10.1074/jbc.270.43.25481. free .
  12. http://news.bbc.co.uk/2/hi/health/7080434.stm Genetic Code of Dandruff Cracked – BBC News
  13. Afonso C, Tulman E, Lu Z, Oma E, Kutish G, Rock D . The Genome of Melanoplus sanguinipes Entomologists . J Virol . 73 . 1 . 533–52 . 1999 . 10.1128/JVI.73.1.533-552.1999 . 9847359 . 103860.
  14. Girod A, Wobus C, Zádori Z, Ried M, Leike K, Tijssen P, Kleinschmidt J, Hallek M . The VP1 capsid protein of adeno-associated virus type 2 is carrying a phospholipase A2 domain required for virus infectivity . J Gen Virol . 83 . Pt 5 . 973–8 . 2002 . 11961250 . 10.1099/0022-1317-83-5-973. free .
  15. Hube B, Stehr F, Bossenz M, Mazur A, Kretschmar M, Schafer W . Secreted lipases of Candida albicans: cloning, characterisation and expression analysis of a new gene family with at least ten members . Arch. Microbiol. . 174 . 5 . 362–374 . 2000 . 11131027 . 10.1007/s002030000218. 2000ArMic.174..362H . 2231039 .
  16. 10.1016/S1388-1981(01)00130-5. Bile salt-dependent lipase: its pathophysiological implications. 2001. Lombardo. Dominique. Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids. 1533. 1 . 1–28. 11514232.
  17. Winkler FK . D'Arcy A . W Hunziker . Structure of human pancreatic lipase . Nature. 343 . 6260 . 771–774 . 1990 . 2106079 . 10.1038/343771a0. 1990Natur.343..771W . 37423900 .
  18. Lowe ME . The triglyceride lipases of the pancreas . J Lipid Res . 43 . 12 . 2007–16 . 2002 . 12454260 . 10.1194/jlr.R200012-JLR200 . free.
  19. https://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=278000 Omim – Wolman Disease
  20. http://ghr.nlm.nih.gov/condition=lipoproteinlipasedeficiencyfamilial Familial lipoprotein lipase deficiency – Genetics Home Reference
  21. Gilbert B, Rouis M, Griglio S, de Lumley L, Laplaud P . Lipoprotein lipase (LPL) deficiency: a new patient homozygote for the preponderant mutation Gly188Glu in the human LPL gene and review of reported mutations: 75 % are clustered in exons 5 and 6 . Ann Genet . 44 . 1 . 25–32 . 2001. 11334614 . 10.1016/S0003-3995(01)01037-1.
  22. Crenon I, Foglizzo E, Kerfelec B, Verine A, Pignol D, Hermoso J, Bonicel J, Chapus C . Pancreatic lipase-related protein type I: a specialized lipase or an inactive enzyme. Protein Eng. 11. 2 . 135–42 . 1998 . 9605548 . 10.1093/protein/11.2.135. free .
  23. De Caro J, Carriere F, Barboni P, Giller T, Verger R, De Caro A . Pancreatic lipase-related protein 1 (PLRP1) is present in the pancreatic juice of several species. Biochim Biophys Acta. 1387. 1–2 . 331–41 . 1998 . 9748646 . 10.1016/S0167-4838(98)00143-5.
  24. Gupta R, Gupta N, Rathi P . Bacterial lipases: an overview of production, purification and biochemical properties. Appl Microbiol Biotechnol. 64. 6 . 763–81 . 2004 . 14966663 . 10.1007/s00253-004-1568-8. 206934353.
  25. Ban K, Kaieda M, Matsumoto T, Kondo A, Fukuda H . Whole cell biocatalyst for biodiesel fuel production utilizing Rhizopus oryzae cells immobilized within biomass support particles. Biochem Eng J. 8. 1. 39–43. 2001. 11356369 . 10.1016/S1369-703X(00)00133-9. 2001BioEJ...8...39B .
  26. 10.1016/j.jclepro.2007.07.003 . A life-cycle comparison between inorganic and biological catalysis for the production of biodiesel . Journal of Cleaner Production . 16 . 13 . 1368–78 . 2008 . Harding . K.G . Dennis . J.S . von Blottnitz . H . Harrison . S.T.L . 2008JCPro..16.1368H .
  27. Guo Z, Xu X . New opportunity for enzymatic modification of fats and oils with industrial potentials. Org Biomol Chem. 3. 14 . 2615–9 . 2005 . 15999195 . 10.1039/b506763d.
  28. 10.1021/cr00038a017. Lipase-Supported Synthesis of Biologically Active Compounds. 1995. Theil. Fritz. Chemical Reviews. 95. 6. 2203–2227.
  29. Org. Synth.. 1990. 69. 10. 10.15227/orgsyn.069.0010. Enantiomerically Pure Ethyl (R)- And (S)- 2-Fluorohexanoate by Enzyme-Catalyzed Kinetic Resolution. P. Kalaritis, R. W. Regenye.
  30. (4R)-(+)-tert-Butyldimethylsiloxy-2-cyclopenten-1-one. Leo A. Paquette, Martyn J. Earle, Graham F. Smith. Org. Synth.. 1996. 73. 36. 10.15227/orgsyn.073.0036.
  31. 10.15227/orgsyn.073.0036. (4R)-(+)-tert-BUTYLDIMETHYLSILOXY-2-CYCLOPENTEN-1-ONE . Organic Syntheses . 1996 . 73 . 36 .
  32. Web site: Lipase – TheTest. Lab Tests Online. 12 May 2014.
  33. "Anthera Pharmaceuticals – Sollpura." Anthera Pharmaceuticals – Sollpura. N.p., n.d. Web. 21 July 2015. .
  34. 10.3109/14756366.2010.525509 . 21028941 . Pancreatic lipase inhibition activity of trilactone terpenes of Ginkgo biloba . Journal of Enzyme Inhibition and Medicinal Chemistry . 26 . 4 . 453–9 . 2010 . Bustanji . Yasser . Al-Masri . Ihab M . Mohammad . Mohammad . Hudaib . Mohammad . Tawaha . Khaled . Tarazi . Hamada . Alkhatib . Hatim S . 23597738 . free .

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