http://linkedlifedata.com/r... | skos:definition | "A protein ubiquitination process in which a polymer of ubiquitin, formed by linkages between lysine residues at position 48 of the ubiquitin monomers, is added to a protein. K48-linked ubiquitination targets the substrate protein for degradation." [GOC:cvs, PMID:15556404] | lld:geneontology |