Reactome: A Curated Pathway Database
Results 1 to 10 of 16
Pathways (7) Reactions (3) Proteins (2) Others (4)
Protein: UniProt:P08559 PDHA1 (Homo sapiens)
Last changed: 2015-03-12 12:55:37

Pathway: Metabolism (Homo sapiens)
Metabolic processes in human cells generate energy through the oxidation of molecules consumed in the diet and mediate the synthesis of diverse essential molecules not taken in the diet as well as the inactivation and elimination of toxic ones generated endogenously or present in the extracellular environment. The processes of energy metabolism can be classified into two groups according to whether the
Last changed: 2015-03-06 23:15:47

Pathway: Signal Transduction (Homo sapiens)
Signal transduction is a process in which extracellular signals elicit changes in cell state and activity. Transmembrane receptors sense changes in the cellular environment by binding ligands, such as hormones and growth factors, or reacting to other types of stimuli, such as light. Stimulation of transmembrane receptors leads to their conformational change which propagates the signal to the intracellu
Last changed: 2015-03-06 23:15:47

Pathway: The citric acid (TCA) cycle and respiratory electron transport (Homo sapiens)
The metabolism of pyruvate provides one source of acetyl-CoA which enters the citric acid (TCA, tricarboxylic acid) cycle to generate energy and the reducing equivalent NADH. These reducing equivalents are re-oxidized back to NAD+ in the electron transport chain (ETC), coupling this process with the export of protons across the inner mitochondrial membrane. The chemiosmotic gradient created is used to
Last changed: 2015-03-06 23:15:47

Pathway: Signaling by Retinoic Acid (Homo sapiens)
Vitamin A (retinol) can be metabolised into active retinoid metabolites that function either as a chromophore in vision or in regulating gene expression transcriptionally and post-transcriptionally. Genes regulated by retinoids are essential for reproduction, embryonic development, growth, and multiple processes in the adult, including energy balance, neurogenesis, and the immune response. The retinoid
Last changed: 2015-03-06 23:15:47

Pathway: Pyruvate metabolism and Citric Acid (TCA) cycle (Homo sapiens)
Pyruvate metabolism and the citric acid (TCA) cycle together link the processes of energy metabolism in a human cell with one another and with key biosynthetic reactions. Pyruvate, derived from the reversible oxidation of lactate or transamination of alanine, can be converted to acetyl CoA. Other sources of acetyl CoA include breakdown of free fatty acids and ketone bodies in the fasting state. Acetyl
Last changed: 2015-03-06 23:15:47

Pathway: Pyruvate metabolism (Homo sapiens)
Pyruvate sits at an intersection of key pathways of energy metabolism. It is the end product of glycolysis and the starting point for gluconeogenesis, and can be generated by transamination of alanine. It can be converted by the pyruvate dehydrogenase complex to acetyl CoA (Reed and Hackert 1990) which can enter the TCA cycle or serve as the starting point for the syntheses of long chain fatty acids, s
Last changed: 2015-03-06 23:15:47

Pathway: Regulation of pyruvate dehydrogenase (PDH) complex (Homo sapiens)
The mitochondrial pyruvate dehydrogenase (PDH) complex catalyzes the oxidative decarboxylation of pyruvate, linking glycolysis to the tricarboxylic acid cycle and fatty acid synthesis. PDH inactivation is crucial for glucose conservation when glucose is scarce, while adequate PDH activity is required to allow both ATP and fatty acid production from glucose. The mechanisms that control human PDH activit
Last changed: 2015-03-06 23:15:47

Reaction: pyruvate + CoASH + NAD+ => acetylCoA + CO2 + NADH + H+ (Homo sapiens)
The mitochondrial pyruvate dehydrogenase complex catalyzes the reaction of pyruvate, CoASH, and NAD+ to form acetylCoA, CO2, and NADH. The enzyme complex contains multiple copies of three different proteins, E1 alpha, E1 beta, E2, and E3, each with distinct catalytic activities (Reed and Hackert 1990; Zhou et al 2001). The reaction starts with the oxidative decarboxylation of pyruvate catalyzed by E1 a
Last changed: 2015-03-12 13:50:51

Reaction: PDK-catalyzed phosphorylation (inactivation) of PDC E1 alpha subunit (Homo sapiens)
Pyruvate Dehydrogenase Kinase (PDK) in the mitochondrial matrix catalyzes the phosphorylation of serine residues of the E1 alpha subunit of the pyruvate dehydrogenase complex, inactivating it. Pyruvate negatively regulates this reaction, and NADH and acetyl CoA positively regulate it (Bao et al. 2004). Four PDK isoforms have been identified and shown to catalyze the phosphorylation of E1 alpha in vitro
Last changed: 2015-03-06 23:15:47

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