Negative elongation factor complex member B (NELF-B)

Negative elongation factor complex member B (NELF-B, COBRA1) is a critical protein component of the NELF complex, which regulates the transcription of genes by pausing RNA polymerase II shortly after initiation, thereby controlling gene expression, proper mRNA processing, and developmental timing. NELF-B anchors other NELF subunits and interacts with co-factors including hormone receptors and chromatin modifiers. It plays an essential role in embryogenesis, stem cell maintenance, hormone response modulation, and defense against unscheduled gene activation. Altered expression or function of NELF-B is linked to diverse malignancies (notably breast, prostate, liver, and GI cancers), with its expression level sometimes serving as a prognostic marker. NELF-B is also involved in the regulation of viral transcription dynamics (such as HIV), but is not currently a direct therapeutic target with established drugs. Broad targeting of NELF-B would have significant physiological consequences due to its central role in essential gene expression regulation[1][2][3].

Other names

COBRA1NELFBKIAA1182Cofactor of BRCA1NELF-Bnegative elongation factor Bnegative elongation factor protein Bcofactor of BRCA1

No drugs with a primary mechanism of action directly targeting NELF-B have been clinically described. Cellular studies indicate that molecules affecting transcriptional elongation/pausing or epigenetic regulation may indirectly involve NELF-B pathways[2]. In the context of HIV, release from NELF-mediated transcriptional pausing is essential for viral gene expression, and some compounds that affect P-TEFb modulate this effect.