Esterase

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An esterase is a hydrolase enzyme that splits esters into an acid and an alcohol in a chemical reaction with water called hydrolysis.

A wide range of different esterases exist that differ in their substrate specificity, their protein structure, and their biological function.

[edit] EC classification/list of enzymes

- Acetylesterase (EC 3.1.1.6), splits off acetyl groups
  - Cholinesterase
    - Acetylcholinesterase, inactivates the neurotransmitter acetylcholine
    - Pseudocholinesterase, broad substrate specificity, found in the blood plasma and in the liver
- Pectinesterase (EC 3.1.1.11), clarifies fruit juices

EC 3.1.2: Thiolester hydrolases
- Thioesterase
  - Ubiquitin carboxy-terminal hydrolase L1

EC 3.1.3: Phosphoric monoester hydrolases
- Phosphatase (EC 3.1.3.x), hydrolyses phosphoric acid monoesters into a phosphate ion and an alcohol
  - Alkaline phosphatase, removes phosphate groups from many types of molecules, including nucleotides, proteins, and alkaloids.
  - Phosphodiesterase (PDE), inactivates the second messenger cAMP
    - cGMP specific phosphodiesterase type 5, is inhibited by Sildenafil (Viagra)
- Fructose bisphosphatase (3.1.3.11), converts fructose-1,6-bisphosphate to fructose-6-phosphate in gluconeogenesis

EC 3.1.4: Phosphoric diester hydrolases

EC 3.1.5: Triphosphoric monoester hydrolases

EC 3.1.6: Sulfuric ester hydrolases (sulfatases)

EC 3.1.7: Diphosphoric monoester hydrolases

EC 3.1.8: Phosphoric triester hydrolases

Exonucleases (deoxyribonucleases and ribonucleases)
- EC 3.1.11: Exodeoxyribonucleases producing 5'-phosphomonoesters
- EC 3.1.13: Exoribonucleases producing 5'-phosphomonoesters
- EC 3.1.14: Exoribonucleases producing 3'-phosphomonoesters
- EC 3.1.15: Exonucleases active with either ribo- or deoxy-

Endonucleases (deoxyribonucleases and ribonucleases)
- Endodeoxyribonuclease
- Endoribonuclease
- either deoxy- or ribo-

[edit] See also

[edit] External links

Enzyme nomenclature

v d e Proteins: enzymes

Topics	Active site · Allosteric regulation · Binding site · Catalytically perfect enzyme · Coenzyme · Cofactor · Cooperativity · EC number · Enzyme catalysis · Enzyme inhibitor · Enzyme kinetics · Lineweaver–Burk plot · Michaelis–Menten kinetics · List of enzymes

Types	EC1 Oxidoreductases/list · EC2 Transferases/list · EC3 Hydrolases/list · EC4 Lyases/list · EC5 Isomerases/list · EC6 Ligases/list

B enzm: 1.1/2/3/4/5/6/7/8/10/11/13/14/15-18, 2.1/2/3/4/5/6/7/8, 2.7.10, 2.7.11-12, 3.1/2/3/4/5/6/7, 3.1.3.48, 3.4.21/22/23/24, 4.1/2/3/4/5/6, 5.1/2/3/4/99, 6.1-3/4/5-6

Hydrolase: esterases (EC 3.1)

3.1.1: Carboxylic ester hydrolases

Cholinesterase (Acetylcholinesterase, Butyrylcholinesterase) · Pectinesterase · 6-phosphogluconolactonase · PAF acetylhydrolase

Lipase (Bile salt-dependent, Gastric/Lingual, Pancreatic, Lysosomal, Hormone-sensitive, Endothelial, Hepatic, Lipoprotein, Monoacylglycerol, Diacylglycerol)

Phospholipase (A1, A2, B)

3.1.2: Thioesterase

Palmitoyl protein thioesterase · Ubiquitin carboxy-terminal hydrolase L1

3.1.3: Phosphatase

Alkaline phosphatase (ALPI, ALPL, ALPP) · Acid phosphatase (Prostatic)/Tartrate-resistant acid phosphatase/Purple acid phosphatases · Nucleotidase · Glucose 6-phosphatase · Fructose 1,6-bisphosphatase · Calcineurin · Phosphoprotein phosphatase (PP2A) · OCRL · Pyruvate dehydrogenase phosphatase · Fructose 6-P,2-kinase:fructose 2,6-bisphosphatase · PTEN · Phytase · Inositol-phosphate phosphatase (IMPA1)

Phosphoprotein phosphatase: Protein tyrosine phosphatase · Protein serine/threonine phosphatase · Dual-specificity phosphatase

3.1.4: Phosphodiesterase

Autotaxin · Phospholipase (C, D) · Sphingomyelin phosphodiesterase (1) · PDE1 · PDE2 · PDE3 · PDE4A/PDE4B · PDE5 · Lecithinase (Clostridium perfringens alpha toxin) · Cyclic nucleotide phosphodiesterase

3.1.6: Sulfatase

arylsulfatase (Arylsulfatase A, Arylsulfatase B, Arylsulfatase E, Steroid sulfatase) · Galactosamine-6 sulfatase · Iduronate-2-sulfatase · N-acetylglucosamine-6-sulfatase

Nuclease (includes
deoxyribonuclease and
ribonuclease)

3.1.11-16: Exonuclease

Exodeoxyribonuclease	RecBCD

Exoribonuclease	Oligonucleotidase

3.1.21-31: Endonuclease

Endodeoxyribonuclease	Deoxyribonuclease I · Deoxyribonuclease II · Deoxyribonuclease IV · Restriction enzyme · UvrABC endonuclease

Endoribonuclease	RNase III · RNase H (1, 2A, 2B, 2C) · RNase P · RNase A (1, 2, 3, 4/5) · RNase T1 · RNA-induced silencing complex

either deoxy- or ribo-	Aspergillus nuclease S1 · Micrococcal nuclease

B enzm: 1.1/2/3/4/5/6/7/8/10/11/13/14/15-18, 2.1/2/3/4/5/6/7/8, 2.7.10, 2.7.11-12, 3.1/2/3/4/5/6/7, 3.1.3.48, 3.4.21/22/23/24, 4.1/2/3/4/5/6, 5.1/2/3/4/99, 6.1-3/4/5-6

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EC 3.1

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