F
IPR001211

Phospholipase A2

InterPro entry
Short namePLipase_A2
Overlapping
homologous
superfamilies
 

Description

Phospholipase A2 (
3.1.1.4
) (PLA2 or PLA2G1B) is a small lipolytic enzyme that releases fatty acids from the second carbon group of glycerol. It is involved in a number of physiologically important cellular processes, such as the liberation of arachidonic acid from membrane phospholipids
[1]
. It plays a pivotal role in the biosynthesis of prostaglandin and other mediators of inflammation. PLA2 has four to seven disulphide bonds and binds a calcium ion that is essential for activity. Within the active enzyme, the alpha amino group is involved in a conserved hydrogen-bonding network linking the N-terminal region to the active site. The side chains of two conserved residues, His and Asp, participate in the catalytic network.

Many PLA2's are widely distributed in snakes, lizards, bees and mammals. In mammals, there are at least four forms: pancreatic, membrane-associated as well as two less well characterised forms. The venom of most snakes contains multiple forms of PLA2
[2, 3]
. Some of them are presynaptic neurotoxins which inhibit neuromuscular transmission by blocking acetylcholine release from the nerve termini.

Some of the proteins in this family are allergens
[4]
. Allergies are hypersensitivity reactions of the immune system to specific substances called allergens (such as pollen, stings, drugs, or food) that, in most people, result in no symptoms. A nomenclature system has been established for antigens (allergens) that cause IgE-mediated atopic allergies in humans [WHO/IUIS Allergen Nomenclature Subcommittee King T.P., Hoffmann D., Loewenstein H., Marsh D.G., Platts-Mills T.A.E., Thomas W. Bull. World Health Organ. 72:797-806(1994)]. This nomenclature system is defined by a designation that is composed of the first three letters of the genus; a space; the first letter of the species name; a space and an arabic number. In the event that two species names have identical designations, they are discriminated from one another by adding one or more letters (as necessary) to each species designation.

The allergens in this family include allergens with the following designations: Api m 1.

References

1.NMR structures of phospholipase A2 reveal conformational changes during interfacial activation. van den Berg B, Tessari M, Boelens R, Dijkman R, de Haas GH, Kaptein R, Verheij HM. Nat. Struct. Biol. 2, 402-6, (1995). View articlePMID: 7664098

2.Exploring and understanding the functional role, and biochemical and structural characteristics of an acidic phospholipase A<sub>2,</sub> AplTx-I, purified from Agkistrodon piscivorus leucostoma snake venom. Resende LM, Almeida JR, Schezaro-Ramos R, Collaco RC, Simioni LR, Ramirez D, Gonzalez W, Soares AM, Calderon LA, Marangoni S, da Silva SL. Toxicon 127, 22-36, (2017). PMID: 28063838

3.PhTX-II a basic myotoxic phospholipase A₂ from Porthidium hyoprora snake venom, pharmacological characterization and amino acid sequence by mass spectrometry. Huancahuire-Vega S, Ponce-Soto LA, Marangoni S. Toxins (Basel) 6, 3077-97, (2014). PMID: 25365526

4.Venomic and transcriptomic analysis of centipede Scolopendra subspinipes dehaani. Liu ZC, Zhang R, Zhao F, Chen ZM, Liu HW, Wang YJ, Jiang P, Zhang Y, Wu Y, Ding JP, Lee WH, Zhang Y. J. Proteome Res. 11, 6197-212, (2012). View articlePMID: 23148443

GO terms

Cross References

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