Involved in the catabolism of quinolinic acid (QA). {ECO:0000269|PubMed:17868694, ECO:0000269|PubMed:24038671, ECO:0000269|PubMed:9473669}. This is the function of QPRT (quinolinate phosphoribosyltransferase, Ensembl gene identifier ENSG00000103485).