Glyceraldehyde-3-Phosphate Dehydrogenase: Difference between revisions

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Nathan Line, David Canner, Andrew Swart, Alice Harmon, Michal Harel, Alexander Berchansky

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 == Function ==
-'''Glyceraldehyde-3-phosphate dehydrogenase''' (GAPDH) is a very important enzyme in the production of energy and in photosynthesis.  In the production of energy this enzyme catalyzes the sixth step in the process of breaking down glucose, also known as glycolysis which occurs in organisms of all phyla. The sixth step consists of of the oxidation of GAP by [[NAD]] and an inorganic phosphate to yield 1,3 bisphosphoglycerate.  In photosynthesis, which is carried out by plants and algae, this enzyme uses '''NADPH''' in the reverse reaction in a step in the Calvin Cycle, which fixes gaseous CO<sub>2</sub> into carbohydrate. Though these are its main functions, GAPDH has been shown to perform other functions including transcription activation, initiation of apoptosis, and ER to Golgi apparatus vesicle transportation <ref>PMID: 22851451</ref>.  However, this page will focus on GAPDH’s role in glycolysis. See [[2pkq]] for the plant Calvin Cycle enzyme.  See [[Glycolysis Enzymes]].
+'''Glyceraldehyde-3-phosphate dehydrogenase''' (GAPDH) is a very important enzyme in the production of energy and in photosynthesis.  In the production of energy this enzyme catalyzes the sixth step in the process of breaking down glucose, also known as [[glycolysis]] which occurs in organisms of all phyla. The sixth step consists of of the oxidation of GAP by [[NAD]] and an inorganic phosphate to yield 1,3 bisphosphoglycerate.  In photosynthesis, which is carried out by plants and algae, this enzyme uses '''NADPH''' in the reverse reaction in a step in the [[Calvin cycle]], which fixes gaseous CO<sub>2</sub> into carbohydrate. Though these are its main functions, GAPDH has been shown to perform other functions including transcription activation, initiation of apoptosis, and ER to Golgi apparatus vesicle transportation <ref>PMID: 22851451</ref>.  However, this page will focus on GAPDH’s role in glycolysis. See [[2pkq]] for the plant Calvin Cycle enzyme. See [[Glycolysis Enzymes]] and [[Carbon Fixation]].
 == Structure ==
-GAPDH most commonly exists as what looks to be a dimer.  Interesting though, the two monomers of the enzyme are not exactly the same.  While one side consists only of parallel and antiparallel beta-sheets, the other monomer is made up of both <scene name='Nathan_Line_sandbox_3/Secondary_structure/1'>beta-sheets and alpha helixes</scene>.  Though each monomer does not have to exact same sequence, each does contain replicate active sites and function.  This is consistent with the following SCOP information:
+GAPDH most commonly exists as what looks to be a dimer.  Interesting though, the two monomers of the enzyme are not exactly the same.  While one side consists only of parallel and antiparallel beta-sheets, the other monomer is made up of both <scene name='Nathan_Line_sandbox_3/Secondary_structure/1'>beta-sheets and alpha helixes</scene>. Though each monomer does not have to exact same sequence, each does contain replicate active sites and function.  This is consistent with the following SCOP information:
 Class: Alpha and beta proteins (a/b)