A salvage pathway is a pathway in which a biological product is produced from intermediates in the degradative pathway of its own or a similar substance. The term often refers to nucleotide salvage in particular, in which nucleotides are synthesized from intermediates in their degradative pathway.
A nucleoside triphosphate is a nucleoside containing a nitrogenous base bound to a 5-carbon sugar, with three phosphate groups bound to the sugar. They are the molecular precursors of both DNA and RNA, which are chains of nucleotides made through the processes of DNA replication and transcription. Nucleoside triphosphates also serve as a source of energy for cellular reactions and are involved in signalling pathways.
In biochemistry, phosphorylases are enzymes that catalyze the addition of a phosphate group from an inorganic phosphate (phosphate+hydrogen) to an acceptor.
Purine nucleoside phosphorylase, PNP, PNPase or inosine phosphorylase is an enzyme that in humans is encoded by the NP gene. It catalyzes the chemical reaction
In enzymology, a pyrimidine-nucleoside phosphorylase is an enzyme that catalyzes the chemical reaction
In enzymology, an aldose-1-phosphate adenylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, an ATP adenylyltransferase (EC 2.7.7.53) is an enzyme that catalyzes the chemical reaction
In enzymology, a galactose-1-phosphate thymidylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a glucose-1-phosphate cytidylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a glucose-1-phosphate guanylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a glucose-1-phosphate thymidylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a mannose-1-phosphate guanylyltransferase (GDP) is an enzyme that catalyzes the chemical reaction
In enzymology, a nucleoside-triphosphate-aldose-1-phosphate nucleotidyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, a ribose-5-phosphate adenylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, an UDP-glucose—hexose-1-phosphate uridylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, an UDP-N-acetylglucosamine diphosphorylase is an enzyme that catalyzes the chemical reaction
In enzymology, an UTP—hexose-1-phosphate uridylyltransferase is an enzyme that catalyzes the chemical reaction
In enzymology, an UTP—xylose-1-phosphate uridylyltransferase is an enzyme that catalyzes the chemical reaction
Xanthosine phosphorylase, also known as inosine-guanosine phosphorylase, is a catalytic enzyme encoded by the XapA gene in E. coli. The presence of xanthosine is known to induce the synthesis of xanthosine phosphorylase by the XapA gene. The enzyme's main functions are nucleoside phosphorolysis and the synthesis of nucleotides, making it a member of the purine nucleoside phosphorylase group. This protein can degrade all purine nucleosides except adenosine, deoxyadenosine, hypoxanthine arabinoside. These degradation reactions are reversible in vitro, however, phosphorolysis dominates in vivo. Xanthosine phosphorylase is localized in the cytoplasm because these degradation functions take place there. Xanthosine phosphorylase preferentially uses the neutral form of xanthosine over its monoanionic form because it prefers to be in a neutral environment.
GDP-D-glucose phosphorylase is an enzyme with systematic name GDP:alpha-D-glucose 1-phosphate guanylyltransferase. This enzyme catalyses the following chemical reaction
