Membrane-integrated hydrogenase 2H+ H2 H 2Ht3-4H+ Out Need O,as terminal electron cyt bccytccyt aa3 accepter In 2H+ 2024Ht 2e- Some H2 bacteria have only the NAD++2 H+ H20 membrane-bound hydrogenase, CO2+ATP ADP ATP and in these organisms reducing NADH一 power synthesis occurs from Cytoplasmic hydrogenase reverse electron flow. Cell material Two hydrogenases: membrane-bound hydrogenase begins the flow of electrons leading to formation of a proton motive force. cytoplasmic hydrogenase makes NADH for the Calvin cycle.The membrane- bound hydrogenaseTwo hydrogenases: membrane-bound hydrogenase begins the flow of electrons leading to formation of a proton motive force. cytoplasmic hydrogenase makes NADH for the Calvin cycle. The membrane￾bound hydrogenase Some H2 bacteria have only the membrane-bound hydrogenase, and in these organisms reducing power synthesis occurs from reverse electron flow. Need O2 as terminal electron accepter