The function of ENSG00000289051 (MLDHR, mitochondrial lactate dehydrogenase regulator) is as follows. Inhibits lactate dehydrogenase (LDH)-mediated conversion of lactate to pyruvate in mitochondria by competing with mitochondrial LDH for binding to NAD(+) (PubMed:33406399). Also inhibits cellular lactate utilization (PubMed:33406399). .