Cutinase

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cutinase
PDB 1cex EBI.jpg
Structure of Fusarium solani cutinase. PDB 1cex.[1]
Identifiers
EC number 3.1.1.74
Databases
IntEnz IntEnz view
BRENDA BRENDA entry
ExPASy NiceZyme view
KEGG KEGG entry
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / EGO
Cutinase
Identifiers
Symbol Cutinase
Pfam PF01083
InterPro IPR000675
PROSITE PDOC00140
SCOP 1cex
SUPERFAMILY 1cex
OPM superfamily 135
OPM protein 1oxm

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

cutin + H2O \rightleftharpoons 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.[2] Plant pathogenic fungi produce extracellular degradative enzymes[3] 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.[2][3]

Cutinase is a serine esterase containing the classical Ser, His, Asp triad of serine hydrolases.[2] 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.[4] The protein also contains 2 disulfide bridges, which are essential for activity, their cleavage resulting in complete loss of enzymatic activity.[2] Two cutinase-like proteins (MtCY39.35 and MtCY339.08c) have been found in the genome of the bacteria Mycobacterium tuberculosis.

References[edit]

  1. ^ Longhi S, Czjzek M, Lamzin V, Nicolas A, Cambillau C (May 1997). "Atomic resolution (1.0 A) crystal structure of Fusarium solani cutinase: stereochemical analysis". J. Mol. Biol. 268 (4): 779–99. doi:10.1006/jmbi.1997.1000. PMID 9175860. 
  2. ^ a b c d Ettinger WF, Thukral SK, Kolattukudy PE (1987). "Structure of cutinase gene, cDNA, and the derived amino acid sequence from phytopathogenic fungi". Biochemistry 26 (24): 7883–7892. doi:10.1021/bi00398a052. 
  3. ^ a b 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. 
  4. ^ 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. doi:10.1038/356615a0. PMID 1560844. 
  • Garcia-Lepe R, Nuero OM, Reyes F, Santamaria F (1997). "Lipases in autolysed cultures of filamentous fungi". Lett. Appl. Microbiol. 25 (2): 127–30. doi:10.1046/j.1472-765X.1997.00187.x. PMID 9281862. 
  • Purdy RE, Kolattukudy PE (1975). "Hydrolysis of plant cuticle by plant pathogens. Purification, amino acid composition, and molecular weight of two isozymes of cutinase and a nonspecific esterase from Fusarium solani f. pisi". Biochemistry 14 (13): 2824–31. doi:10.1021/bi00684a006. PMID 1156575. 
  • Purdy RE, Kolattukudy PE (1975). "Hydrolysis of plant cuticle by plant pathogens. Properties of cutinase I, cutinase II, and a nonspecific esterase isolated from Fusarium solani pisi". Biochemistry 14 (13): 2832–40. doi:10.1021/bi00684a007. PMID 239740. 

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