Purine-rich element-binding protein B (PURB)

Purine-rich element-binding protein B (PURB) is a sequence-specific, single-stranded DNA-binding protein that preferentially binds to purine-rich elements (PUR elements) found at DNA replication origins and gene flanking regions across eukaryotes. It is a member of the Pur family of transcription factors, sharing structural similarities with PURA. PURB regulates gene expression by acting as a transcriptional activator or repressor, influencing cell differentiation, development (notably in muscle, blood, and brain), and specific cellular processes such as hepatic glucose production and mRNA transport in neurons. It has been specifically noted to regulate the transcription of key genes involved in muscle and smooth muscle cell biology and plays a role in amino acid-induced milk protein and fat synthesis in mammary cells via mTOR and SREBP-1c. Deletions or dysregulation of the PURB gene have been linked to hematological malignancies, especially myelodysplastic syndrome and acute myelogenous leukemia, as well as to neurodevelopmental disorders. PURB has not been identified as a direct target for approved therapeutic drugs and currently does not have characterized pharmacological agents or mechanism-of-action inhibitors.[1][2][3][4][5]

Other names

Transcriptional activator protein Pur-betaPURBETATranscriptional regulator protein Pur-betaPurine-rich element binding protein B