The structure of ActVA-Orf6, a novel type of monooxygenase involved in actinorhodin biosynthesisSciara, G., Kendrew, S.G., Miele, A.E., Marsh, N.G., Federici, L., Malatesta, F., Schimperna, G., Savino, C., Vallone, B.
(2003) Embo J. 22: 205-215
- PubMed: 12514126
- DOI: 10.1093/emboj/cdg031
- Primary Citation of Related Structures:  1LQ9, 1N5Q, 1N5S, 1N5V
- PubMed Abstract:
- Identification of a monooxygenase from Streptomyces coelicolor A3 (2) involved in the biosynthesis of actinorhodin: purification and characterization of the recombinant enzyme
Kendrew, S.G.,Hopwood, D.A.,Marsh, E.N.
(1997) J.Bacteriol. 179: 4305
- Crystallization and preliminary X-ray diffraction studies of a monooxygenase from Streptomyces coelicolor A3(2) involved in the biosynthesis of the polyketide actinorhodin
Kendrew, S.G.,Federici, L.,Savino, C.,Miele, A.E.,Marsh, E.N.,Vallone, B.
(2000) Acta Crystallogr.,Sect.D 56: 481
ActVA-Orf6 monooxygenase from Streptomyces coelicolor that catalyses the oxidation of an aromatic intermediate of the actinorhodin biosynthetic pathway is a member of a class of small monooxygenases that carry out oxygenation without the assistance o ...
ActVA-Orf6 monooxygenase from Streptomyces coelicolor that catalyses the oxidation of an aromatic intermediate of the actinorhodin biosynthetic pathway is a member of a class of small monooxygenases that carry out oxygenation without the assistance of any of the prosthetic groups, metal ions or cofactors normally associated with activation of molecular oxygen. The overall structure is a ferredoxin-like fold with a novel dimeric assembly, indicating that the widely represented ferredoxin fold may sustain yet another functionality. The resolution (1.3 A) of the enzyme structure and its complex with substrate and product analogues allows us to visualize the mechanism of binding and activation of the substrate for attack by molecular oxygen, and utilization of two gates for the reaction components including a proton gate and an O(2)/H(2)O gate with a putative protein channel. This is the first crystal structure of an enzyme involved in the tailoring of a type II aromatic polyketide and illustrates some of the enzyme-substrate recognition features that may apply to a range of other enzymes involved in modifying a polyketide core structure.
Dipartimento di Scienze Biochimiche and CNR, Centro di Studi sulla Biologia Molecolare, Università di Roma 'La Sapienza', Piazzale A.Moro, 5, 00185 Roma, Italy.