Dictionary » P » Phosphoenolpyruvate carboxylase

Phosphoenolpyruvate carboxylase

Definition

noun

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.


Supplement

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

PEP + CO2oxaloacetate + Pi


Abbreviation: PEPC, PEPCase, PEP carboxylase

See also: CAM plant, C4 plant


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Results from our forum


C4 and photorespiration

... oxygen. This is done by an accesory fixation pathway: the enzyme PEP carboxylase first fixes CO2 onto Phosphoenolpyruvate(PEP) to give phosphate and oxaloacetate which is then reduced to malate ...

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by MrMistery
Wed Sep 24, 2008 2:25 am
 
Forum: Botany Discussion
Topic: C4 and photorespiration
Replies: 1
Views: 3867

TO ANYBODY THAT HAS ANYQUESTIONS ON PHOTOSYNTHESIS

... While most C-fixation begins with RuBP, C-4 begins with a new molecule, phosphoenolpyruvate (PEP), a 3-C chemical that is converted into oxaloacetic ... The capture of carbon dioxide by PEP is mediated by the enzyme PEP carboxylase, which has a stronger affinity for carbon dioxide than does RuBP ...

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by CoolJay221
Thu Feb 09, 2006 7:14 pm
 
Forum: Botany Discussion
Topic: TO ANYBODY THAT HAS ANYQUESTIONS ON PHOTOSYNTHESIS
Replies: 5
Views: 12426

Question: Does a plant constantly go through photosynthesis?

... While most C-fixation begins with RuBP, C-4 begins with a new molecule, phosphoenolpyruvate (PEP), a 3-C chemical that is converted into oxaloacetic ... The capture of carbon dioxide by PEP is mediated by the enzyme PEP carboxylase, which has a stronger affinity for carbon dioxide than does RuBP ...

See entire post
by CoolJay221
Thu Feb 09, 2006 6:51 pm
 
Forum: Botany Discussion
Topic: Question: Does a plant constantly go through photosynthesis?
Replies: 3
Views: 9518


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