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Figure 1.
Figure 1. The oxidation of NH[3] to NO[2]^− by Nitrosomonas
europaea. Ammonia is first oxidized to hydroxylamine
(NH[2]OH) by ammonia monooxygenase (AMO.) The product, NH[2]OH,
is oxidized to NO[ 2]^− by HAO. The released electrons are
transferred to cyt c554 (a two electron acceptor) and then
possibly to cyt c552 (a one electron acceptor), which ultimately
passes electrons to terminal oxidases. The electron transfer
pathway following the oxidation of NH[2]OH to NO[2]^− is not
fully understood and alternative electron transfer routes may
exist^30, including the transfer of electrons from cyt c554
directly to a membrane-bound electron transport chain^31.
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