BIO 351 Lecture 8 7 Pathways of Autotrophic Carbon Fixation

Ultimately reduces Carbon into Organic Carbon for storage

What do ALL Carbon Fixation Pathways have in common?

Uses 9 ATP and 6 NADPH

depends on Sugars

used by Aerobic microbes

NADPH carriers

not stable in high temperatures

Calvin Cycle

Uses 2 ATP, reverse TCA cycle, electrons carriers are; NADPH, Ferredoxin, and NADH, used by anaerobic microbes

rTCA Cycle

Uses 1 ATP and PM for Archaea, used by microbes with low metabolism, NADH, NADPH, and Fd carriers for bacteria. Fd and FH2 carriers for Archaea.

Wood-Ljundahl Pathway

Uses 7 ATP, fixes carbon from Bicarbonate, only found in Chloroflexaceae, NADPH carrier, and active at high temps

3-HP Cycle

Uses 5 ATP

produces Pyruvate as central precursor

O2 sensitive

used by Crenarchaeota

DC/4-HB Pathway

Uses 9 ATP

prodcues Oxaloacetate as central precursor

microaerobes/anaerobes

3-HP/4-GB Pathway

Uses 1 ATP converts; Formate, NH3, and CO2 into Glycine, typically Anaerobic

(Relatively New)

Reductive glycine pathway