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De Novo - Medical Definition from MediLexicon

reported the identification of hydroxyalkanoates biologicalpolyesters containing carbon chains different from hydroxybutyrate ()

Studies on the amino acids in the vitamin K-dependent region of prothrombinindicate that vitamin K is involved in the derivatization of glutamic acid by

De novo legal definition of de novo

N2 - Salmonella typhimurium is able to synthesize cobalamin (B12) under anaerobic growth conditions. The previously described cobalamin biosynthetic mutations (phenotypic classes CobI, CobII, and CobIII) map in three operons located near the his locus (minute 41). A new class of mutant (CobIV) defective in B12 biosynthesis was isolated and characterized. These mutations map between the cysB and trp loci (minute 34) and define a new genetic locus, cobA. The anaerobic phenotype of cobA mutants suggests an early block in corrin ring formation; mutants failed to synthesize cobalamin de novo but did so when the corrin ring is provided as cobyric acid dicyanide or as cobinamide dicyanide. Under aerobic conditions, cobA mutants were unable to convert either cobyric acid dicyanide or cobinamide dicyanide to cobalamin but could use adenosylcobyric acid or adenosylcobinamide as a precursor; this suggests that the mutants are unable to adenosylate exogenous corrinoids. To explain the anaerobic CobI phenotype of a cobA mutant, we propose that the cobA gene product catalyzes adenosylation of an early intermediate in the de novo B12 pathway and also adenosylates exogenous corrinoids. Under anaerobic conditions, a substitute function, known to be encoded in the main Cob operons, is induced; this substitute function can adenosylate exogenous cobyric acid and cobinamide but not the early biosynthetic intermediate. The cobA gene of S. typhimurium appears to be functionally equivalent to the btuR gene of Escherichia coli.

Define salvage pathway and a de novo pathway - …

AB - Salmonella typhimurium is able to synthesize cobalamin (B12) under anaerobic growth conditions. The previously described cobalamin biosynthetic mutations (phenotypic classes CobI, CobII, and CobIII) map in three operons located near the his locus (minute 41). A new class of mutant (CobIV) defective in B12 biosynthesis was isolated and characterized. These mutations map between the cysB and trp loci (minute 34) and define a new genetic locus, cobA. The anaerobic phenotype of cobA mutants suggests an early block in corrin ring formation; mutants failed to synthesize cobalamin de novo but did so when the corrin ring is provided as cobyric acid dicyanide or as cobinamide dicyanide. Under aerobic conditions, cobA mutants were unable to convert either cobyric acid dicyanide or cobinamide dicyanide to cobalamin but could use adenosylcobyric acid or adenosylcobinamide as a precursor; this suggests that the mutants are unable to adenosylate exogenous corrinoids. To explain the anaerobic CobI phenotype of a cobA mutant, we propose that the cobA gene product catalyzes adenosylation of an early intermediate in the de novo B12 pathway and also adenosylates exogenous corrinoids. Under anaerobic conditions, a substitute function, known to be encoded in the main Cob operons, is induced; this substitute function can adenosylate exogenous cobyric acid and cobinamide but not the early biosynthetic intermediate. The cobA gene of S. typhimurium appears to be functionally equivalent to the btuR gene of Escherichia coli.

discovered the essentiality of thelong-chain polyunsaturated fatty acids (linoleic and linolenic acids) ().

Anderson RJ reported the presence of inositol in lipids of tubercle bacilli ().

First demonstration of the biosynthesis of vitamin A from

De novo and salvage pathway of purines - SlideShare

1961, 83, 3080) made the first total synthesis of arachidonic acid.

Imai J demonstrated that the oxidative desaturation of a saturated fatty acid (palmitic acid) is depressed in diabetic rats ().

Kennedy EP described the general pathways of the glycerolipid biosynthesis in animal cells ().

Bremer J et al.

Salmonella typhimurium is able to synthesize cobalamin (B12) under anaerobic growth conditions. The previously described cobalamin biosynthetic mutations (phenotypic classes CobI, CobII, and CobIII) map in three operons located near the his locus (minute 41). A new class of mutant (CobIV) defective in B12 biosynthesis was isolated and characterized. These mutations map between the cysB and trp loci (minute 34) and define a new genetic locus, cobA. The anaerobic phenotype of cobA mutants suggests an early block in corrin ring formation; mutants failed to synthesize cobalamin de novo but did so when the corrin ring is provided as cobyric acid dicyanide or as cobinamide dicyanide. Under aerobic conditions, cobA mutants were unable to convert either cobyric acid dicyanide or cobinamide dicyanide to cobalamin but could use adenosylcobyric acid or adenosylcobinamide as a precursor; this suggests that the mutants are unable to adenosylate exogenous corrinoids. To explain the anaerobic CobI phenotype of a cobA mutant, we propose that the cobA gene product catalyzes adenosylation of an early intermediate in the de novo B12 pathway and also adenosylates exogenous corrinoids. Under anaerobic conditions, a substitute function, known to be encoded in the main Cob operons, is induced; this substitute function can adenosylate exogenous cobyric acid and cobinamide but not the early biosynthetic intermediate. The cobA gene of S. typhimurium appears to be functionally equivalent to the btuR gene of Escherichia coli.

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de novo and salvage pathway of purines ..

reported the reversed-phase separation of fatty acids by acomplex two-dimensional TLC employing a catalytic hydrogenationon the plate ().

First description of a direct titration method for analytical hydrogenation todetermine precisely the unsaturation of lipids ().

Discovery of O-amino acid (alanyl and lysyl) esters of phosphatidylglycerol in agram-positive bacteria ().

The first GLC analysis of natural triglycerides from milk fat was reported ().

Hematoside, the ganglioside of horse erythrocytes, is the first ganglioside(GM3) whose structure was elucidated ().

The complete structure of sulfatide (sulfated galactosylceramide) was elucidatedincluding the position of the sulfate group attached to the C3 of galactose ().

Methyl jasmonate was discovered in flowers of jasmine and was shown to be afragrant component in the essential oil from these flowers ().

Discovery of diether-type phospholipids in a an extremely halophilic bacteria () ().

First demonstration of the presence of 2-aminoethylphosphonic acid and itsglycerol ester in lipid extractsof the sea anemone, ().

De Novo Synthesis of Purine Nucleotides - Gout

first described the presence of monogalactosyl diacylglycerol inan animal tissue, the bovine brain ().

A sulfonated glycolipid (sulfoquinovosyl diacylglycerol) was discovered in thegreen alga ().

Determination of de novo and pool emissions of …

29-70).

The first component protein of an enzyme of fatty acid biosynthesis, fatty acidsynthase, was purified ().

Polyprenol diphosphates were shown to be involved in the biosynthesis ofpolysaccharides in () and in the biosynthesis of peptidoglycans in ().

The structure of juvenile hormone of insects was elucidated by Roller H ().

and results in the arrest of de novo synthesis of DNA

Definitions
1. Anew; often applied to particular biochemical pathways in which metabolites are newly biosynthesized (de novo purine biosynthesis).

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