PRDM1
Function
Transcription factor that mediates a transcriptional program in various innate and adaptive immune tissue-resident lymphocyte T cell types such as tissue-resident memory T (Trm), natural killer (trNK) and natural killer T (NKT) cells and negatively regulates gene expression of proteins that promote the egress of tissue-resident T-cell populations from non-lymphoid organs. Plays a role in the development, retention and long-term establishment of adaptive and innate tissue-resident lymphocyte T cell types in non-lymphoid organs, such as the skin and gut, but also in other nonbarrier tissues like liver and kidney, and therefore may provide immediate immunological protection against reactivating infections or viral reinfection (By similarity). Binds specifically to the PRDI element in the promoter of the beta-interferon gene (PubMed:1851123). Drives the maturation of B-lymphocytes into Ig secreting cells (PubMed:12626569). Associates with the transcriptional repressor ZNF683 to chromatin at gene promoter regions (By similarity). Binds to the promoter and acts as a transcriptional repressor of IRF8, thereby promotes transcription of osteoclast differentiation factors such as NFATC1 and EEIG1 (By similarity).
Involvement in disease
In certain aggressive cases of activated B cell-like diffuse large B-cell lymphoma (ABC-DLBCL), PRDM1 protein instability has been observed. This instability, which impairs B-cell differentiation, is caused by N-terminal misfolding mutations, including those occurring at positions Pro-84 and Ile-107, and results in PRDM1 protein sequestration in the cytoplasm, followed by proteasomal degradation via a heat shock protein 70 HSPA1A-SYNV1/HRD1 pathway. These N-terminal mutations do not affect PRDM1 transcription regulation activity. HSPA1A inhibition restores PRDM1 nuclear localization and transcriptional activity in lymphoma cell lines and suppresses tumor growth in xenografts, more efficiently than proteasome inhibition.
Post-translational modifications
Sumoylation at Lys-816 by PIAS1 augments transcriptional repressor activity, and is critical for plasma cell differentiation (PubMed:22555612). Can be sumoylated with SUMO1 and SUMO2 by PML. Degradation of the wild-type protein mostly depends upon sumoylation, rather than ubiquitination (PubMed:28842558). Desumoylated by SENP1 and SENP6 (PubMed:28842558).
Ubiquitinated by the SCF(FBXO11) complex, leading to its degradation by the proteasome.
Sequence Similarities
Belongs to the class V-like SAM-binding methyltransferase superfamily.
Cellular localization
- Nucleus
- Cytoplasm
Alternative names
BLIMP1, PRDM1, PR domain zinc finger protein 1, BLIMP-1, Beta-interferon gene positive regulatory domain I-binding factor, PR domain-containing protein 1, Positive regulatory domain I-binding factor 1, PRDI-BF1, PRDI-binding factor 1