Photosynthesis anaerobic/anoxygenic

Continuum of metabolic strategies. AnAnP, anaerobic anoxygenic photosynthesis OP, oxygenic photosynthesis AAnP, aerobic anoxygenic photosynthesis RP/PC, rhodopsin and other pigments HT, heterotroph DOM, dissolved organic matter. Source-. From Filer, A. (2006). Applied Environmental MIoroblology, 42(12), 7431-7437. 

In Table 2, the phototrophs have been grouped with regard to which electron donors (reductants) are used during photosynthesis. When a reductant is utilized, it leaves behind an oxidized product that can have substantial biogeochemical impact. Thus, as shown in Table 2, for the anaerobic (anoxygenic) photosynthetic bacteria, a wide range of electron donors are used, each of which... 

In class VI are ADP-Glc PPases from anaerobic bacteria Rhodospirillum, capable of growing in either hetero-trophic conditions in the dark or autotrophic conditions in the light under anoxygenic photosynthesis (Table 1). These organisms cannot catabolize glucose but grow very well on pyruvate and tricarboxylic acid cycle (TCA) intermediates. ADP-Glc PPases from class VI are specifically regulated by pyruvate (Table... 

Equation (25) describes a process of electron transfer from donor molecules to CO2 (for both oxygenic and anoxygenic photosynthesis). Unlike the anaerobic processes described in Section 3, in which the electron transfer is frequently extracellular (between cells), the electron transfer in photosynthesis is intracellular. As such, it can occur completely via biological electron carriers, and without need for free electron carriers such as H2. However, the presence of hydrogenase enzymes in representatives from both classes of phototrophs [2,24,25] makes H2 metabolism possible in both accessory and primary roles. 

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