上海交通大学：《微生物学 Microbiology》课程教学资源（双语课件）Lecture 13.2 Metabolic diversity（Chemolithotrophy）Chemolithotrophy：energy from the oxidation of inorganic electron donors 化能无机营养生物：通过氧化无机物而 获得能量

TON 13.9 Iron Oxidation 铁氧化 The aerobic oxidation of iron from the ferrous (Fe2+)to ferric (Fe3+)state is an energy-yielding reaction for some prokaryotes:iron-oxidizing bacteria.铁氧化细菌：有氧条 件下氧化亚铁而获得能量 Cytochrome a interacts with O2 to form H2O ATP is synthesized from ATPases in the membrane Autotrophy in Acidithiobacillus ferrooxidans is driven by the Calvin cycle Chen Feng,Microbiology,SJTU

Chen Feng, Microbiology, SJTU 13.9 Iron Oxidation 铁氧化 The aerobic oxidation of iron from the ferrous (Fe2+) to ferric (Fe3+) state is an energy-yielding reaction for some prokaryotes: iron-oxidizing bacteria.铁氧化细菌: 有氧条 件下氧化亚铁而获得能量 Cytochrome a interacts with O2 to form H2O ATP is synthesized from ATPases in the membrane Autotrophy in Acidithiobacillus ferrooxidans is driven by the Calvin cycle

Need O,as terminal electron accepter Electron flow during 3H20 Fe2+oxidation. Out Fe2+ Fe3+ ---->Fe(OH3+3H pH 2) Electrons travel a short electron transport chain Outer membrane cyt c resulting in the Rusticyanin 铜蓝蛋白 reduction of O2 to H2O. 2H+ 3-4H+ Reducing power to drive the Calvin cycle comes from reactions of Reverse e-flow reverse electron flow. cyt bc cyt c cyt aaa n (pH 6) CO2+ATP NADH- Cell material ADP ATP 2012 Pearson Education,Inc

Electrons travel a short electron transport chain resulting in the reduction of O 2 to H 2O. Reducing power to drive the Calvin cycle comes from reactions of reverse electron flow. Electron flow during Fe2+ oxidation. Need O 2 as terminal electron accepter 铜蓝蛋白

Iron Oxidation 铁氧化 Fe2+can be oxidized under anoxic conditions by certain anoxygenic phototrophic bacteria:Fe2+is used in this case not as an electron donor in energy metabolism,but as an electron donor for CO2 reduction (autotrophy). 氧光合细菌利用亚铁：固定CO,的电子供体而非能量代谢的 电子供体 a (b)

Chen Feng, Microbiology, SJTU Iron Oxidation 铁氧化 Fe2+ can be oxidized under anoxic conditions by certain anoxygenic phototrophic bacteria: Fe2+ is used in this case not as an electron donor in energy metabolism, but as an electron donor for CO2 reduction (autotrophy). 非产 氧光合细菌利用亚铁: 固定CO2的电子供体而非能量代谢的 电子供体