| Baker's pyridine extraction | Hot pyridine treatment of tissues fixed in dilute Bouin's fixative, used to extract phospholipids from tissues as a control in the histochemical staining of this material. (05 Mar 2000) |
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| pyridine | <physiology> A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colourless liquid with a peculiar pungent odour. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaines, may be mentioned. See Lutidine. Origin: From Gr. Fire. Source: Websters Dictionary (01 Mar 1998) |
| adenine nucleotide | A condensation product of adenosine and phosphoric acid; a nucleotide found among the hydrolysis products of all nucleic acids. 3'-Adenylic acid (adenosine 3'-monophosphate) and 5'-adenylic acid (adenosine 5'-monophosphate) differ in the place of attachment of the phosphoric acid to the d-ribose; deoxyadenylic acid differs in having H instead of OH at the 2' position of d-ribose. See: AMP. Synonym: adenine nucleotide. (05 Mar 2000) |
| adenine nucleotide translocase | <enzyme> Catalyses the exchange between endogenous and exogenous adenine nucleotides in mitochondria.ec 2.7.7.-. Registry number: EC 2.7.7.- (12 Dec 1998) |
| cyclic nucleotide | A nucleoside monophosphate in which the phosphoryl group is linked twice to the sugar moiety; e.g., adenosine 3',5'-cyclic monophosphate (cAMP). (05 Mar 2000) |
| cyclic nucleotide-regulated protein kinases | <enzyme> A group of enzymes that catalyses the phosphorylation of serine or threonine residues of proteins and is dependent on cyclic nucleotides. Registry number: EC 2.7.10.- (12 Dec 1998) |
| xanthine nucleotide | The monophosphoric ester of xanthosine. An intermediate in GMP biosynthesis. Synonym: xanthidylic acid, xanthine nucleotide, xanthylic acid. (05 Mar 2000) |
| pyrimidine-5'-nucleotide nucleosidase | <enzyme> Also acts on some deoxyribonucleotides Registry number: EC 3.2.2.10 Synonym: pyr-5'-nt-nucleosidase (26 Jun 1999) |
| nicotinamide-nucleotide adenylyltransferase | <enzyme> An enzyme that catalyses reversibly the transfer of the adenylyl moiety of ATP to the phosphoryl group of nmn to form NAD+ and pyrophosphate. The enzyme is found predominantly in the nuclei and catalyses the final reaction in the major pathway for the biosynthesis of NAD in mammals. Chemical name: ATP:nicotinamide-nucleotide adenylyltransferase Registry number: EC 2.7.7.1 (12 Dec 1998) |
| nucleotide | <biochemistry> Phosphate esters of nucleosides. The metabolic precursors of nucleic acids are monoesters with phosphate on carbon 5 of the pentose (known as 5' to distinguish sugar from base numbering). However many other structures, such as adenosine 3'5' cyclic monophosphate (cAMP) and molecules with 2 or 3 phosphates are also called nucleotides. (18 Nov 1997) |
| nucleotide 3'-pyrophosphokinase-2',3'-cyclic monophosphokinase | <enzyme> Transfers 5'-beta,gamma-pyrophosphate from ATP and some ATP derivatives to nucleotides and nucleosides at the 3'-hydroxyl group; synthesises the respective 3'-pyrophosphoryl nucleotides Registry number: EC 2.7.6.- Synonym: ppkase (26 Jun 1999) |
| nucleotide binding fold | Protein motif consisting of a fold or pocket with certain conserved residues, required for the binding of nucleotides. (18 Nov 1997) |
| nucleotide deaminases | <enzyme> Catalyze the hydrolysis of nucleotides with the elimination of ammonia. Registry number: EC 3.5.4 (12 Dec 1998) |
| nucleotide deletion | Deletion of a single nucleotide, which in a transcribed gene will lead to a frameshift mutation. Synonym: point deletion. (05 Mar 2000) |
| nucleotide mapping | Two-dimensional separation and analysis of nucleotides. (12 Dec 1998) |