Phosphoenolpyruvic acid

Phosphoenolpyruvic acid
Names

IUPAC name 2-(phosphonooxy)acrylic acid
Other names Phosphoenolpyruvic acid, PEP
Identifiers
CAS Number	138-08-9^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:44897^Y
ChemSpider	980^Y
DrugBank	DB01819^Y
ECHA InfoCard	100.004.830
IUPHAR/BPS	4692
PubChem CID	1005
InChI InChI=1S/C3H5O6P/c1-2(3(4)5)9-10(6,7)8/h1H2,(H,4,5)(H2,6,7,8)^Y Key: DTBNBXWJWCWCIK-UHFFFAOYSA-N^Y
SMILES O=C(O)C(OP(=O)(O)O)=C
Properties
Chemical formula	C₃H₅O₆P
Molar mass	168.042
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is ^YN ?)
Infobox references

Phosphoenolpyruvic acid (PEP), or phosphoenolpyruvate (2-phosphoenolpyruvate) as the anion, is an important chemical compound in biochemistry. It has the highest-energy phosphate bond found (−61.9 kJ/mol) in living organisms, and is involved in glycolysis and gluconeogenesis. In plants, it is also involved in the biosynthesis of various aromatic compounds, and in carbon fixation; in bacteria, it is also used as the source of energy for the phosphotransferase system.

In glycolysis

PEP is formed by the action of the enzyme enolase on 2-phosphoglyceric acid. Metabolism of PEP to pyruvic acid by pyruvate kinase (PK) generates 1 molecule of adenosine triphosphate (ATP) via substrate-level phosphorylation. ATP is one of the major currencies of chemical energy within cells.

2-phospho-D-glycerate	Enolase		phosphoenolpyruvate	Pyruvate kinase		pyruvate

		H₂O		ADP	ATP

		H₂O

	Enolase			Pyruvate kinase

Compound C00631 at KEGG Pathway Database. Enzyme 4.2.1.11 at KEGG Pathway Database. Compound C00074 at KEGG Pathway Database. Enzyme 2.7.1.40 at KEGG Pathway Database. Compound C00022 at KEGG Pathway Database.

In gluconeogenesis

PEP is formed from the decarboxylation of oxaloacetate and hydrolysis of one guanosine triphosphate molecule. This reaction is catalyzed by the enzyme phosphoenolpyruvate carboxykinase (PEPCK). This reaction is a rate-limiting step in gluconeogenesis:^[1]

GTP + oxaloacetate → GDP + phosphoenolpyruvate + CO₂

Interactive pathway map

Click on genes, proteins and metabolites below to link to respective articles. ^{[§ 1]}

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|{{{bSize}}}px|alt=Glycolysis and Gluconeogenesis edit]]

Glycolysis and Gluconeogenesis edit

↑ The interactive pathway map can be edited at WikiPathways: "GlycolysisGluconeogenesis_WP534".

In plants

PEP may be used for the synthesis of chorismate through the shikimate pathway.^[2] Chorismate may then be metabolized into the aromatic amino acids (phenylalanine, tryptophan and tyrosine) and other aromatic compounds. The first step is when Phosphoenolpyruvate and erythrose-4-phosphate react to form 3-deoxy-D-arabinoheptulosonate-7-phosphate (DAHP), in a reaction catalyzed by the enzyme DAHP synthase.

Biosynthesis of DAHP from phosphoenolpyruate and erythrose-4-phosphate

In addition, in C₄ plants, PEP serves as an important substrate in carbon fixation. The chemical equation, as catalyzed by phosphoenolpyruvate carboxylase (PEP carboxylase), is:

PEP + HCO₃⁻ → oxaloacetate

References

↑ "InterPro: IPR008209 Phosphoenolpyruvate carboxykinase, GTP-utilising". Retrieved 2007-08-17.
↑ "BioCarta - Charting Pathways of Life". Retrieved 2007-08-17.

Glycolysis metabolic pathway

Glucose	Hexokinase		Glucose 6-phosphate	Glucose-6-phosphate isomerase	Fructose 6-phosphate	phosphofructokinase-1		Fructose 1,6-bisphosphate	Fructose-bisphosphate aldolase
	ATP	ADP				ATP	ADP

Dihydroxyacetone phosphate		Glyceraldehyde 3-phosphate	Triosephosphate isomerase		Glyceraldehyde 3-phosphate	Glyceraldehyde-3-phosphate dehydrogenase			1,3-Bisphosphoglycerate
						NAD⁺ + P_i	NADH + H⁺
	+			2				2

Phosphoglycerate kinase

3-Phosphoglycerate

Phosphoglycerate mutase

2-Phosphoglycerate

Phosphopyruvate hydratase(Enolase)

Phosphoenolpyruvate

Pyruvate kinase

Pyruvate

ADP

ATP

H₂O

ADP

ATP

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