title: Engineering of a novel chimera of superoxide dismutase and Vitreoscilla hemoglobin for rapid detoxification of reactive oxygen species.
abstract: The genes encoding human manganese superoxide dismutase (MnSOD) and Vitreoscilla hemoglobin (VHb) were fused in-frame to generate a bifunctional enzyme that possessed MnSOD and peroxidase-like activities. At neutral pH, the coupling of the SOD and peroxidase reactions revealed that the bifunctional enzyme exhibited a 2.5 times shorter transient period and a 1.67 times higher reaction rate at steady-state conditions. Furthermore, the catalytic rate of the bifunctional enzyme was not affected as much by the external H₂O₂ scavenger catalase. This indicates that the bifunctional protein possesses a greater antioxidant capability, which is possibly due to the close proximity between the active site of MnSOD and the heme moiety of VHb. Our findings not only provide insight into the synergistic functions of SOD and peroxidase but also could potentially be used to develop novel therapeutic agents with more efficient O₂ carrying capability.
authors.affiliation: Department of Clinical Microbiology, Faculty of Medical Technology, Mahidol University, Bangkok 10700, Thailand.
authors.forename: Chartchalerm
authors.initials: C
authors.lastname: Isarankura-Na-Ayudhya
authors.forename: Sakda
authors.initials: S
authors.lastname: Yainoy
authors.forename: Tanawut
authors.initials: T
authors.lastname: Tantimongcolwat
authors.forename: Leif
authors.initials: L
authors.lastname: Bülow
authors.forename: Virapong
authors.initials: V
authors.lastname: Prachayasittikul
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D006801:Humans; D018384:Oxidative Stress; D010088:Oxidoreductases / Q000378:metabolism; D010544:Peroxidases / Q000378:metabolism; D015202:Protein Engineering; D017382:Reactive Oxygen Species / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000378:metabolism; D013482:Superoxide Dismutase / Q000235:genetics / Q000378:metabolism*; D054793:Truncated Hemoglobins / Q000235:genetics / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D001426:Bacterial Proteins; D017382:Reactive Oxygen Species; D011993:Recombinant Fusion Proteins; D054793:Truncated Hemoglobins; C082613:hemoglobin protein, Vitreoscilla; D010088:Oxidoreductases; D010544:Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase