MGY377H1 Lecture Notes - Lecture 10: Cupriavidus Necator, Electron Acceptor, Nitrifying Bacteria
21 Nov 2013
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Document Summary
Chemolithotrophs: use alternate electron donors in the absence of organic compounds or light for energy generation, use inorganic compounds (h2, h2s, s0, fe2+, nh3, no2, obtain carbon from co2, obtain energy from oxidation of inorganic compounds. Electron transport chain, essentially same as chemoorganotrophs: reducing power for biosynthesis comes from. Reverse electron flow: h2 oxidizing bacteria. H2 is a common product of bacterial metabolism. Membrane-bound enzyme that passes electrons directly to etc. Reductant (nadh) generated directly from h2 by soluble form in cytoplasm: generate reductant that can be used for calvin cycle, lower on the electron tower, in some bacteria only (e. g. , ralstonia eutropha) Two proton pumping steps generate a pmf for atp production: sulphur oxidizing bacteria. Oxidation of sulphur compounds is step wise. Enter at different components depending on reduction potential. 2-) is an important intermediate in oxidation steps. 2-) by two pathways: sulphite oxidase pathway, aps reductase pathway. Reductant (nadh) generated by reverse electron flow: iron oxidizing bacteria.
