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Purine nucleosides can be synthesize in two ways, de novo biosynthesis and salvaging pathways. In salvaging pathways nucleosides from RNA and DNA breakdown can reenter purine nucleoside de novo biosynthesis.

Website=www.biocyc.org/Ecoli/Pathways/
free text=Voet and Voet  (textbook)  Biochemistry
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<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p3</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r4"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s20" initialAmount="0.0" name="Deoxyguanosine_br_phosphorylase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Deoxyguanosine phosphorylase
Synonym:  Synonym not specified
Accession:  P03248
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p4</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r7"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s21" initialAmount="0.0" name="Guanosine kinase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Guanosine kinase
Synonym:  Synonym not specified
Accession:  P03251
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
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</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r2"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s22" initialAmount="0.0" name="Guanine phosphoribosyl_br_transferase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Guanine phosphoribosyltransferase
Synonym:  Synonym not specified
Accession:  P03245
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
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</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r3"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s23" initialAmount="0.0" name="Guanosine phosphorylase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Guanosine phosphorylase
Synonym:  Synonym not specified
Accession:  P03250
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
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</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
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</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s24" initialAmount="0.0" name="ribose-1-_br_phosphate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  ribose-1-phosphate
Synonym:  Synonym not specified
Accession:  S04338
</body>
</html>
</notes>
<annotation>
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<celldesigner:speciesIdentity>
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</celldesigner:speciesIdentity>
</annotation>
</species>
</listOfSpecies>
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<annotation>
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</celldesigner:listOfReactantLinks>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
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</model>
</sbml>

