Reactome: A Curated Pathway Database
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Pathways (6) Reactions (3) Proteins (1) Others (4)
Protein: UniProt:P07195 LDHB (Homo sapiens)
Last changed: 2014-11-26 10:20:21

Pathway: Disease (Homo sapiens)
Biological processes are captured in Reactome by identifying the molecules (DNA, RNA, protein, small molecules) involved in them and describing the details of their interactions. From this molecular viewpoint, human disease pathways have three mechanistic causes: the inclusion of microbially-expressed proteins, altered functions of human proteins, or changed expression levels of otherwise functionally
Last changed: 2014-11-21 19:49:01

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: 2014-11-21 19:49:01

Pathway: Abnormal metabolism in phenylketonuria (Homo sapiens)
Phenylalanine hydroxylase (PAH) catalyzes the conversion of phenylalanine to tyrosine. In the absence of functional PAH, phenylalanine accumulates to high levels in the blood (Mitchell and Scriver 2010) and is converted to phenylpyruvate and phenyllactate (Clemens et al. 1990; Langenbeck et al. 1992). The extent of these conversions is modulated by genetic factors distinct from PAH, as siblings with th
Last changed: 2014-11-21 19:49:01

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: 2014-11-21 19:49:01

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: 2014-11-21 19:49:01

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: 2014-11-21 19:49:01

Reaction: phenylpyruvate + NADH + H+ => phenyllactate + NAD+ (Homo sapiens)
The ability of human lactate dehydrogenase to catalyze the reaction of phenylalanine with NADH + H+ to form phenyllactate and NAD+ is inferred from the properties of bovine heart lactate dehydrogenase (Meister 1951). As these studies were carried out only on the one bovine isoform, the reaction is inferred only for the corresponding human isoform. The reaction rate measured for bovine LDHB acting on ph
Last changed: 2014-11-21 19:49:01

Reaction: Pyruvate + NADH + H+ <=> (S)-Lactate + NAD+ (Homo sapiens)
Cytosolic lactate dehydrogenase catalyzes the reversible reaction of pyruvate and NADH + H+ to form lactate and NAD+. In the body under anaerobic conditions such as are found in red blood cells or rapidly exercising skeletal muscle, this reaction regenerates NAD+, allowing the continuation of glycolysis. Lactate dehydrogenase is active as a tetramer. Two isoforms of lactate dehydrogenase, A and B, a
Last changed: 2014-11-21 19:49:01

Reaction: (S)-Lactate + NAD+ <=> Pyruvate + NADH + H+ (Homo sapiens)
Cytosolic lactate dehydrogenase catalyzes the freely reversible reaction of lactate and NAD+ to form pyruvate and NADH + H+. In liver parenchymal cells, this reaction allows lactate from red blood cells and exercising muscle to be converted to pyruvate which in turn is typically used for gluconeogenesis which also consumes the NADH from the reaction. Lactate dehydrogenase is active as a tetramer. Two
Last changed: 2014-11-25 21:08:03

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