Ceci 2011 Extremophiles: Difference between revisions
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|journal=Extremophiles | |journal=Extremophiles | ||
|abstract=Ferritin from the hyperthermophilic anaerobe Thermotoga maritima, a bacterium of ancient phylogenetic origin, is structurally similar to known bacterial and eukaryotic ferritins: 24 identical subunits assemble into a shell having octahedral symmetry and a Mr of about 460 kDa. T. maritima ferritin (TmFtn), purified to homogeneity as a recombinant protein, contains approximately 2-3 iron atoms and can incorporate efficiently up to 3,500 atoms in the form of a ferric oxy-hydroxide mineral at 80ยฐC, the optimal growth temperature of the bacterium. The 24-mer unexpectedly dissociates reversibly into dimers at low ionic strengths. In turn, dimers re-associate into the native 24-mer assembly at high protein concentrations and upon incorporation of iron micelles containing at least 500 Fe(III). TmFtn uses O(2) as efficient iron oxidant. The reaction stoichiometry is 3-4 O(2):Fe(II) as in all bacterial ferritins. Accordingly no H(2)O(2) is released into solution, a feature reflected in the in vitro ability of TmFtn to reduce significantly iron-mediated oxidative damage to DNA at 80ยฐC. A similar TmFtn-mediated ROS detoxifying role likely occurs in the bacterium which lacks the SOD/catalase defense systems of the aerobic world. | |abstract=Ferritin from the hyperthermophilic anaerobe Thermotoga maritima, a bacterium of ancient phylogenetic origin, is structurally similar to known bacterial and eukaryotic ferritins: 24 identical subunits assemble into a shell having octahedral symmetry and a Mr of about 460 kDa. T. maritima ferritin (TmFtn), purified to homogeneity as a recombinant protein, contains approximately 2-3 iron atoms and can incorporate efficiently up to 3,500 atoms in the form of a ferric oxy-hydroxide mineral at 80ยฐC, the optimal growth temperature of the bacterium. The 24-mer unexpectedly dissociates reversibly into dimers at low ionic strengths. In turn, dimers re-associate into the native 24-mer assembly at high protein concentrations and upon incorporation of iron micelles containing at least 500 Fe(III). TmFtn uses O(2) as efficient iron oxidant. The reaction stoichiometry is 3-4 O(2):Fe(II) as in all bacterial ferritins. Accordingly no H(2)O(2) is released into solution, a feature reflected in the in vitro ability of TmFtn to reduce significantly iron-mediated oxidative damage to DNA at 80ยฐC. A similar TmFtn-mediated ROS detoxifying role likely occurs in the bacterium which lacks the SOD/catalase defense systems of the aerobic world. | ||
|keywords=thermotoga maritima ferritin, subunit association-dissociation properties, iron incorporation, DNA protection, | |keywords=thermotoga maritima ferritin, subunit association-dissociation properties, iron incorporation, DNA protection, ROS detoxification | ||
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{{Labeling | {{Labeling | ||
|instruments=Oxygraph-2k | |instruments=Oxygraph-2k | ||
|organism=Bacteria | |organism=Bacteria | ||
|preparations= | |preparations=Enzyme | ||
}} | }} |
Revision as of 12:43, 5 September 2011
Ceci P, Forte E, Di Cecca G, Fornara M, Chiancone E (2011) The characterization of Thermotoga maritima ferritin reveals an unusual subunit dissociation behavior and efficient DNA protection from iron-mediated oxidative stress. Extremophiles 15(3):431-439. |
Ceci P, Forte E, Di Cecca G, Fornara M, Chiancone E (2011) Extremophiles
Abstract: Ferritin from the hyperthermophilic anaerobe Thermotoga maritima, a bacterium of ancient phylogenetic origin, is structurally similar to known bacterial and eukaryotic ferritins: 24 identical subunits assemble into a shell having octahedral symmetry and a Mr of about 460 kDa. T. maritima ferritin (TmFtn), purified to homogeneity as a recombinant protein, contains approximately 2-3 iron atoms and can incorporate efficiently up to 3,500 atoms in the form of a ferric oxy-hydroxide mineral at 80ยฐC, the optimal growth temperature of the bacterium. The 24-mer unexpectedly dissociates reversibly into dimers at low ionic strengths. In turn, dimers re-associate into the native 24-mer assembly at high protein concentrations and upon incorporation of iron micelles containing at least 500 Fe(III). TmFtn uses O(2) as efficient iron oxidant. The reaction stoichiometry is 3-4 O(2):Fe(II) as in all bacterial ferritins. Accordingly no H(2)O(2) is released into solution, a feature reflected in the in vitro ability of TmFtn to reduce significantly iron-mediated oxidative damage to DNA at 80ยฐC. A similar TmFtn-mediated ROS detoxifying role likely occurs in the bacterium which lacks the SOD/catalase defense systems of the aerobic world. โข Keywords: thermotoga maritima ferritin, subunit association-dissociation properties, iron incorporation, DNA protection, ROS detoxification
Labels:
Organism: Bacteria"Bacteria" is not in the list (Human, Pig, Mouse, Rat, Guinea pig, Bovines, Horse, Dog, Rabbit, Cat, ...) of allowed values for the "Mammal and model" property.
Preparation: Enzyme
HRR: Oxygraph-2k