Cutinase

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Cutinase
Identifiers
SymbolCutinase
PfamPF01083
InterProIPR000675
PROSITEPDOC00140
SCOP1cex
SUPERFAMILY1cex
OPM superfamily135
OPM protein1oxm

A cutinase (EC 3.1.1.74) is an enzyme that catalyzes the chemical reaction

cutin + H2O cutin monomers

Thus, the two substrates of this enzyme are cutin and H2O, whereas its product is cutin monomer.

This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name of this enzyme class is cutin hydrolase.

Aerial plant organs are protected by a cuticle composed of an insoluble polymeric structural compound, cutin, which is a polyester composed of hydroxy and hydroxyepoxy fatty acids[1]. Plant pathogenic fungi produce extracellular degradative enzymes[2] that play an important role in pathogenesis. They include cutinase, which hydrolyses cutin, facilitating fungus penetration through the cuticle. Inhibition of the enzyme can prevent fungal infection through intact cuticles. Cutin monomers released from the cuticle by small amounts of cutinase on fungal spore surfaces can greatly increase the amount of cutinase secreted by the spore, the mechanism for which process is as yet unknown[1][2].

Cutinase is a serine esterase containing the classical Ser, His, Asp triad of serine hydrolases[1]. The protein belongs to the alpha-beta class, with a central beta-sheet of 5 parallel strands covered by 5 helices on either side of the sheet. The active site cleft is partly covered by 2 thin bridges formed by amino acid side chains, by contrast with the hydrophobic lid possessed by other lipases[3]. The protein also contains 2 disulphide bridges, which are essential for activity, their cleavage resulting in complete loss of enzymatic activity[1]. Two cutinase-like proteins (MtCY39.35 and MtCY339.08c) have been found in the genome of the bacteria Mycobacterium tuberculosis.

References

  1. 1.0 1.1 1.2 1.3 Ettinger WF, Thukral SK, Kolattukudy PE (1987). "Structure of cutinase gene, cDNA, and the derived amino acid sequence from phytopathogenic fungi". Biochemistry. 26: 7883–7892.
  2. 2.0 2.1 Sweigard JA, Chumley FG, Valent B (1992). "Cloning and analysis of CUT1, a cutinase gene from Magnaporthe grisea". Mol. Gen. Genet. 232 (2): 174–182. PMID 1557023.
  3. Cambillau C, Martinez C, De Geus P, Lauwereys M, Matthyssens G (1992). "Fusarium solani cutinase is a lipolytic enzyme with a catalytic serine accessible to solvent". Nature. 356 (6370): 615–618. PMID 1560844.

External links

Gene Ontology (GO) codes

This article incorporates text from the public domain Pfam and InterPro: IPR000675

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