SPIB
Domain
The protein contains a weakly acidic N-terminal transactivation domain (TAD) followed by a second TAD rich in proline, serine and threonine. Each of these domains may be required for transcriptional activation of a subset of target genes.
Function
Sequence specific transcriptional activator which binds to the PU-box, a purine-rich DNA sequence (5'-GAGGAA-3') that can act as a lymphoid-specific enhancer. Promotes development of plasmacytoid dendritic cells (pDCs), also known as type 2 DC precursors (pre-DC2) or natural interferon (IFN)-producing cells. These cells have the capacity to produce large amounts of interferon and block viral replication. May be required for B-cell receptor (BCR) signaling, which is necessary for normal B-cell development and antigenic stimulation.
Sequence Similarities
Belongs to the ETS family.
Tissue Specificity
Expressed in plasmacytoid dendritic cells (pDCs) and B-cells, not expressed in T-cells or granulocytes. May also be enriched in stem cell populations of the liver.
Cellular localization
- Isoform 1
- Nucleus
- Isoform 2
- Cytoplasm
Alternative names
Transcription factor Spi-B, SPIB