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MetNet - plant pathway - sucrose degradation VI (anaerobic)
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Pathway details: sucrose degradation VI (anaerobic)


General info Interaction details Linked pathways Protein-protein interactions
Notes
  Pathway was created on Tue Jul 30, 2013.
 Contributed by aracyc:
Oxygen deprivation is a primary stress in plants subjected to flooding. Under low oxygen tensions, plants modify several aspects of their metabolism, in particular by shifting from respiratory to fermentative energy production |CITS:[RICARD94],[VARTAPETIAN97]|. Increased activity of the ethanol fermentation pathway from pyruvate allows reoxidation of NADH produced in glycolysis, thus enabling the plant to generate ATP independent of oxidative phosphorylation . Anaerobic treatment of maize seedling was shown to drastically alter the profile of total protein synthesis. In an anaerobic environment 20 proteins, which account for more than 70% of the total translation, are selectively synthesized . Most of the anaerobic proteins identified were found to be enzymes of glycolysis or sugar-phosphate metabolism: sucrose synthase, aldolase, pyruvate decarboxylase, enolase, glucose-6-phosphate isomerase, glyceraldehyde-3-phosphate dehydrogenase, alcohol dehydrogenase . Under anaerobic conditions, sucrose is mobilized from several other pathways to enter glycolysis via its conversion to glucose and fructose. Whereas in an aerobic environment the end-product of glycolysis: pyruvate, is metabolized into acetyl-CoA and carbon dioxide, under anaerobic conditions, pyruvate is metabolized to form either lactate or ethanol. Evidence suggests that the reduction of pyruvate to lactate by lactate dehydrogenase is a minor pathway. Indeed, the lowering of pH concomitant to lactate accumulation is likely to switch off lactate production whilst activating pyruvate decarboxylase involved in the conversion of pyruvate to acetaldehyde, in turn metabolized to ethanol by alcohol dehydrogenase |CITS:[DEY97]|.
  Parts of this pathway occur in:   cytosol     plastid stroma     nucleus     plastid     mitochondrion     apoplast   multiple locations  


interactions
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Enzymatic reaction
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Catalysis
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Linked pathways
Browse entities [420]: By type Sources & sinks All entities

Type
metabolite [42]
protein complex [33]
RNA [114]
polypeptide [117]
gene [114]


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