Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:4.1.2.13 (aldolase)
 3,461 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

In rat hepatocytes exposed to [2-13C]pyruvate, newly formed glucose was more efficiently labeled in the carbon C5 than C2, as well as in the carbon C6 than C1, suggesting enzyme-to-enzyme channeling of D-glyceraldehyde 3-phosphate between glyceraldehyde-3-phosphate dehydrogenase and phosphofructoaldolase. Likewise the C1/C2 and C6/C5 ratios for 13C abundance in newly formed glucose, which largely exceeded the C3/C2 ratio of lactate or alanine and could reflect reversibility in the fumarase reaction, were compatible with the enzyme-to-enzyme tunneling of symmetrical Krebs cycle intermediates in the sequence of reactions catalyzed by succinyl-CoA synthetase, succinate dehydrogenase, and fumarase. This study further indicates that the major fraction of pyruvate is metabolized via pyruvate carboxylase rather than pyruvate dehydrogenase.
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PMID:D-glucose generation from [2-13C]pyruvate in rat hepatocytes: implications in terms of enzyme-to-enzyme channelling. 880 44

Goldman, Manuel (The University of Michigan, Ann Arbor), and Harold J. Blumenthal. Pathways of glucose catabolism in Bacillus cereus. J. Bacteriol. 87:377-386. 1964.-Estimates by a radiorespirometric method of the pathways of glucose catabolism of resting-cell suspensions of Bacillus cereus strain terminalis indicate that the Embden-Meyerhof pathway predominates at every stage of development, including the sporogenic and germinative phases. At the filamentous, granular, forespore, and transitional stages, 98% of the glucose was catabolized by the Embden-Meyerhof pathway, and the remainder by the hexose monophosphate oxidative pathway. Estimates of the pathways in resting spore-suspensions arrested at defined stages of development indicate that 20% of the glucose was catabolized through the hexose monophosphate pathway in germinated spores, and 10% in the swollen and elongated stages of postgermination. In cells which had completed the first cell division, the figure fell to about 2%, a level similar to that found for vegetative cells at later stages of development. The key Embden-Meyerhof enzymes, hexokinase, phosphohexoisomerase, phosphofructokinase, and aldolase, as well as several other enzymes, were present at all stages of germination and postgerminative development, supporting the radioisotopic data obtained with whole cells. As indicated by the release of C(14)O(2) from glucose-6-C(14), terminal respiration of resting-cell suspensions operates maximally in vegetative cells at the granular, fore-spore, and transitional stages. There was marked inhibition of terminal respiration during the development of spores into vegetative cells. Only slight activity occurred in the earliest vegetative stages, and maximal operation developed after about ten cell divisions. Fumarase was absent in spores until sometime late in the elongation stage. At this point, a weak but definite activity appeared which increased during later stages of development so that, by the end of about the sixth cell division, fumarase had a specific activity about 80 times that observed at elongation.
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PMID:PATHWAYS OF GLUCOSE CATABOLISM IN BACILLUS CEREUS. 1415 Oct 60

Two isoenzymes each of phosphoglucomutase, hexose phosphate isomerase, aldolase, fructose diphosphatase, phosphofructokinase, and 6-phosphogluconate dehydrogenase have been separated by DEAE-cellulose column chromatography of extracts from endosperm of germinating castor beans (Ricinus communis cv. Hale). One of each of the enzymes is localized in the cytosol and the other is confined to plastids. Developmental studies of these isoenzymes were carried out to clarify their roles in the endosperm. In extracts from ungerminated seeds the activities of marker enzymes of mitochondria (fumarase), plastids (ribulose bisphosphate carboxylase), and glyoxysomes (catalase) were low, but phosphoglucomutase, hexose phosphate isomerase, aldolase, and 6-phosphogluconate dehydrogenase were present in relatively high activity. The total amounts of these enzymes increased 3- to 4-fold during the first 5 days of growth. The activities of isoenzymes in the plastids rose in parallel with that of ribulose bisphosphate carboxylase to reach a maximum at day 4, and like the carboxylase they declined sharply thereafter. The activities of the cytosolic isoenzymes peaked at day 5. These changes are consistent with the roles previously proposed for the sequences present in plastid and cytosol.
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PMID:Isoenzymes of sugar phosphate metabolism in endosperm of germinating castor beans. 1666 46

We conducted an allozyme electrophoretic study to explore potential enzyme markers to distinguish Opisthorchis viverrini in Thailand and Lao PDR. Twenty-eight enzymes encoding presumptive 32 loci were established. The enzymes glucose-6-phosphate dehydrogenase and pyruvate kinase were diagnostic between two geographically separate isolates from Thailand. Twelve enzymes, ie, aconitate hydratase, aldolase, creatine kinase, enolase, esterases, fumarate hydratase, aspartate aminotransferase, glucose-phosphate isomerase, alanine aminotransferase, isocitrate dehydrogenase, malic enzyme, and pyruvate kinase, also provided diagnostic markers for these two isolates from Thailand and one isolate from Lao PDR.
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PMID:Enzyme markers to identify and characterize Opisthorchis viverrini in Thailand and Lao PDR. 1754 51

Succinic acid is an important platform chemical for synthesis of C4 compounds. We applied genome shuffling to improve fermentative production of succinic acid by A. succinogenes. Using a screening strategy composed of selection in fermentation broth, cultured in 96-deep-well plates, and condensed HPLC screening, a starting population of 11 mutants producing a higher succinic acid concentration was selected and subjected to recursive protoplasts fusion. After three rounds of genome shuffling, strain F3-II-3-F was obtained, producing succinic acid at 1.99 g/l/h with a yield of 95.6 g/l. The genome shuffled strain had about a 73 % improvement in succinic acid production compared to the parent strain after 48 h in fed-batch fermentation. The genomic variability of F3-II-3-F was confirmed by amplified fragment-length polymorphism. The activity levels of key enzymes involved in end-product formation from glucose and metabolic flux distribution during succinic acid production were compared between A. succinogenes CGMCC 1593 and F3-II-3-F. Increased activity of glucokinase, fructose-1,6-bisphosphate aldolase, PEP carboxykinase and fumarase, as well as decreased activity of pyruvate kinase, pyruvate formate-lyase, and acetate kinase explained the enhanced succinic acid production and decreased acetic acid formation. Metabolic flux analysis suggested that increased flux to NADH was the main reason for increased activity of the C4 pathway resulting in increased yields of succinic acid. The present work will be propitious to the development of a bio-succinic acid fermentation industry.
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PMID:Enhanced succinic acid production by Actinobacillus succinogenes after genome shuffling. 2367 29

1. Electron microscopic studies of the sieve tube sap obtained from the secondary phloem of Robinia pseudoacacia by the method of Hartig (1860) showed the presence of well developed mitochondria in addition to membrane fragments. 2. In this sieve tube sap the following enzymes could be detected qualitatively: UTP-glucose-1-phosphate-uridyl transferase, UDPG-fructose glucosyl transferase, glucose-6-phosphate dehydrogenase, hexokinase (for glucose and fructose), phosphohexose isomerase, phosphofructokinase, and UDPG-pyrophosphatase. 3. The following enzymes were determined quantitatively: phosphorylase, amylase, aldolase, triosephosphate isomerase, NAD(+)-dependent glyceraldehyde-3-phosphate dehydrogenase, phosphoglyceromutase, enolase, pyruvate kinase, pyruvate decarboxylase, alcohol dehydrogenase, isocitrate dehydrogenase, fumarase, malate dehydrogenase, glutamate-pyruvate transaminase, glutamate dehydrogenase, glutamate-oxalacetate transaminase, and anorganic pyrophosphatase. 4. The following enzymes could not be detected: UDGP dehydrogenase, UDPG-fructose-6-phosphate-glucosyltransferase, invertase, phosphoglucomutase, lactate dehydrogenase, and citrate synthase. 5. The enzyme pattern in the sieve tube saps of Tilia platyphyllos, Carpinus betulus, Fraxinus americana, Quercus borealis maxima, and Salix viminalis is qualitatively similar to that of Robinia, but shows quantitative differences (as far as analyzed). 6. The meaning of the results for the metabolism and function of the sieve tubes in situ is discussed.
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PMID:[Enzyme activities in the sieve tube sap of Robinia pseudoacacia L. and of other tree species]. 2449 58

Paracoccidioides species are dimorphic fungi and are the etiologic agents of paracoccidioidomycosis, which is a serious disease that involves multiple organs. The many tissues colonized by this fungus suggest a variety of surface molecules involved in adhesion. A surprising finding is that most enzymes in the glycolytic pathway, tricarboxylic acid (TCA) cycle and glyoxylate cycle in Paracoccidioides spp. have adhesive properties that aid in interacting with the host extracellular matrix and thus act as 'moonlighting' proteins. Moonlighting proteins have multiple functions, which adds a dimension to cellular complexity and benefit cells in several ways. This phenomenon occurs in both eukaryotes and prokaryotes. For example, moonlighting proteins from the glycolytic pathway or TCA cycle can play a role in bacterial pathogenesis by either acting as proteins secreted in a conventional pathway and/or as cell surface components that facilitate adhesion or adherence. This review outlines the multifunctionality exhibited by many Paracoccidioides spp. enzymes, including aconitase, aldolase, glyceraldehyde-3-phosphate dehydrogenase, isocitrate lyase, malate synthase, triose phosphate isomerase, fumarase, and enolase. We discuss the roles that moonlighting activities play in the virulence characteristics of this fungus and several other human pathogens during their interactions with the host.
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PMID:The multifaceted roles of metabolic enzymes in the Paracoccidioides species complex. 2556 29


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