May be involved in the regulation of dNTP production. Induces the SOS system when expressed in E.coli, therefore, it may play a role in DNA metabolism and/or in genome stability. Expression is induced by the KAR4 transcription factor. Suppresses the lethality of LCD1 and RAD53 mutations. Leads to resistance to the chemicals that inhibit nucleotide metabolism and increases dNTP levels in the presence of hydroxyurea. Belongs to the short-chain dehydrogenases/reductases (SDR) family. Related to oxidoreductases, but misses the conserved Thr active site. Therefore it may not have any oxidoreductase activity.