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<![CDATA[
Various proteins are covalently modified on lysine side chain residues with the 76 amino acid peptide ubiquitin.  This can lead to targeting for degradation by the proteasome machinery or can merely be the basis for regulatory control such as activation of receptor endocytosis. 
Medline=14685250
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<species compartment="c1" initialAmount="0.0" name="s11">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  PPi
Synonym:  Synonym not specified
Accession:  S01889
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
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</celldesigner:speciesIdentity>
</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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</celldesigner:listOfProductLinks>
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<annotation>
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<annotation>
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<annotation>
<celldesigner:alias>a11</celldesigner:alias>
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<annotation>
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<annotation>
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<annotation>
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<annotation>
<celldesigner:alias>a4</celldesigner:alias>
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<annotation>
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<annotation>
<celldesigner:alias>a22</celldesigner:alias>
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<speciesReference species="s2">
<annotation>
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</annotation>
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</reaction>
</listOfReactions>
</model>
</sbml>

