Violaksantin deepoksidaza (EC 1.10.99.3, VDE) je enzim sa sistematskim imenom violaksantin:askorbat oksidoreduktaza.[1][2][3][4][5][6][7] Ovaj enzim katalizuje sledeću hemijsku reakciju

Violaksantin deepoksidaza
Identifikatori
EC broj1.10.99.3
CAS broj57534-73-3
Baze podataka
IntEnzIntEnz pregled
BRENDABRENDA pristup
ExPASyNiceZyme pregled
KEGGKEGG pristup
MetaCycmetabolički put
PRIAMprofil
Strukture PBPRCSB PDB PDBe PDBj PDBsum
violaksantin + 2 L-askorbat zeaksantin + 2 L-dehidroaskorbat + 2H2O (sveukupna reakcija)
(1a) violaksantin + L-askorbat anteraksantin + L-dehidroaskorbat + H2O
(1b) antheraksantin + L-askorbat zeaksantin + L-dehidroaskorbat + H2O

Zajedno sa EC 1.14.13.90, zeaksantinskom epoksidazom, ovaj enzim formira deo ksantofilnog (ili violaksantinskog) ciklusa za kontrolu koncentracije zeaksantina u hloroplastima.

Reference

уреди
  1. ^ Yamamoto, H.Y. & Higashi, R.M. (1978). „Violaxanthin de-epoxidase. Lipid composition and substrate specificity”. Arch. Biochem. Biophys. 190: 514—522. PMID 102251. 
  2. ^ Rockholm, D.C. & Yamamoto, H.Y. (1996). „Violaxanthin de-epoxidase”. Plant Physiol. 110: 697—703. PMID 8742341. 
  3. ^ Bugos, R.C., Hieber, A.D. and Yamamoto, H.Y. (1998). „Xanthophyll cycle enzymes are members of the lipocalin family, the first identified from plants”. J. Biol. Chem. 273: 15321—15324. PMID 9624110. 
  4. ^ Kuwabara, T., Hasegawa, M., Kawano, M. and Takaichi, S. (1999). „Characterization of violaxanthin de-epoxidase purified in the presence of Tween 20: effects of dithiothreitol and pepstatin A”. Plant Cell Physiol. 40: 1119—1126. PMID 10635115. 
  5. ^ Latowski, D., Kruk, J., Burda, K., Skrzynecka-Jaskierm, M., Kostecka-Gugala, A. and Strzalka, K. (2002). „Kinetics of violaxanthin de-epoxidation by violaxanthin de-epoxidase, a xanthophyll cycle enzyme, is regulated by membrane fluidity in model lipid bilayers”. Eur. J. Biochem. 269: 4656—4665. PMID 12230579. 
  6. ^ Goss, R. (2003). „Substrate specificity of the violaxanthin de-epoxidase of the primitive green alga Mantoniella squamata (Prasinophyceae)”. Planta. 217: 801—812. PMID 12748855. 
  7. ^ Latowski, D., Akerlund, H.E. and Strzalka, K. (2004). „Violaxanthin de-epoxidase, the xanthophyll cycle enzyme, requires lipid inverted hexagonal structures for its activity”. Biochemistry. 43: 4417—4420. PMID 15078086. 

Literatura

уреди

Spoljašnje veze

уреди