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PEP carboxylase



An enzyme in the carboxylases responsible for the formation of the four-carbon compound oxaloacetate by catalyzing the binding of one molecule of carbon dioxide to the three-carbon compound phosphoenolpyruvate.


PEP carboxylase is vital in CAM and C4 plants during photosynthesis. It serves as the catalyst for the following chemical reaction:

PEP + CO2oxaloacetate + Pi

Word origin: from the abbreviation of phosphoenolpyruvate carboxylase

Variant: PEPC, PEPCase

See also: CAM plant, C4 plant

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Re: Photosynthesis/carbon fixing

No, the level of rubisco carboxylase. In the first example, rubisco carboxylase is normal level and the oxygen evolution is consistently higher than CO2 uptake. In the second example, rubisco carboxylase is at 40% its normal level. O2 ...

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by johnboy
Fri May 25, 2012 4:28 pm
Forum: Botany Discussion
Topic: Photosynthesis/carbon fixing
Replies: 8
Views: 5118

Photosynthesis/carbon fixing

... graphs. In all the graphs the oxygen levels, illumination and temperature are constant. The only variation is the level of the enzyme rubisco carboxylase which is set at normal for the first graph, 40% of normal in the second and 10% of normal in the third. The x-axis represents the uptake ...

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by johnboy
Thu May 24, 2012 11:48 am
Forum: Botany Discussion
Topic: Photosynthesis/carbon fixing
Replies: 8
Views: 5118

Please help!

... Oxaloacetate is a compound (C4O5) in the tricarboxylic acid cycle, it is an isomer of Malate, after the action of Malate Dehydrogenase or Pyruvate Carboxylase, and is a compund which has been formed (sometimes oxaloacetate, sometimes acetyl, depending on the end compound that will be produced) ...

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by billyfisher100
Sat Jan 21, 2012 1:13 pm
Forum: Cell Biology
Topic: Please help!
Replies: 10
Views: 7392

Re: bifunctional proteins

It's hard to beat RuBisCO (Ribulose bisphosphate carboxylase/oxygenase) as an extremely abundant example of a protein that catalyzes several reactions (though at a single active site). Also, what about the proteins involved in developmental patterning ...

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by jonmoulton
Tue Nov 03, 2009 4:32 pm
Forum: Molecular Biology
Topic: bifunctional proteins
Replies: 4
Views: 5557

Converting Glucose to Fat or ATP?

... For example, AMP regulates fatty acid synthesis and catabolism by controlling availability of malonyl-CoA." "Regulation of Acetyl-CoA Carboxylase by local metabolites: * Palmitoyl-CoA, the product of Fatty Acid Synthase, promotes the inactive conformation of Acetyl-CoA Carboxylase ...

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by MrMistery
Sun Dec 14, 2008 3:48 pm
Forum: Cell Biology
Topic: Converting Glucose to Fat or ATP?
Replies: 13
Views: 36369
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