Overview
BRD4 is a member of the BET (bromodomain and extra-terminal) family of proteins that recognize acetylated lysine residues on histones. It plays a pivotal role in regulating gene expression by recruiting transcription factors and positive transcription elongation factor (P-TEFb) to chromatin. Discovered in the early 2000s, BRD4 has since become a prime target in epigenetic drug discovery due to its involvement in numerous pathological processes. As a dual bromodomain protein, BRD4 contains two conserved domains (BD1 and BD2) that bind to acetylated histones. Its C-terminal domain interacts with other transcriptional machinery components. The protein is ubiquitously expressed in human tissues and has been implicated in cell cycle regulation, DNA damage response, and viral latency.
Physical and Chemical Properties
BRD4 is a large nuclear protein with a molecular weight of approximately 200 kDa. Its structure includes N-terminal tandem bromodomains, an extraterminal (ET) domain, and a C-terminal domain (CTD). The bromodomains form characteristic hydrophobic pockets that selectively bind ε-N-lysine acetylation motifs. The protein exhibits pH-dependent solubility in aqueous buffers, typically requiring neutral to slightly basic conditions (pH 7.0-8.0) for optimal stability. Recombinant BRD4 used in research is usually expressed in E. coli or insect cell systems, with purity levels exceeding 90% for functional studies. Its activity is sensitive to oxidation and requires reducing agents like DTT in storage buffers.
Main Applications
In pharmaceutical research, BRD4 is primarily targeted for cancer therapy, particularly in hematological malignancies like AML and multiple myeloma. Small-molecule inhibitors such as JQ1 and I-BET762 compete with acetyl-lysine binding, disrupting oncogenic transcriptional programs. Over 20 BRD4-targeting compounds have entered clinical trials as of 2023. Beyond oncology, BRD4 modulation shows promise in treating inflammatory diseases (e.g., COPD, rheumatoid arthritis) and viral infections (notably HIV latency reversal). In basic research, BRD4 reagents are essential for studying chromatin dynamics, super-enhancer function, and transcriptional regulation mechanisms. Diagnostic applications include biomarker development for BRD4-dependent cancers.
Safety and Storage
As a research-grade biological, BRD4 protein requires proper handling under Biosafety Level 1 or 2 conditions. Use nitrile gloves and lab coats when handling, and avoid inhalation of lyophilized powder. Spills should be treated with appropriate disinfectants. For storage, aliquoting is recommended to minimize freeze-thaw cycles. Lyophilized protein is stable at -80°C for years, while solutions maintain activity for weeks at -20°C with 10-50% glycerol. Always centrifuge briefly before opening vials to prevent protein loss. Shipping typically requires dry ice for long-term stability during transit.
B2B Procurement Guide
When sourcing BRD4 proteins or inhibitors, prioritize suppliers with comprehensive characterization data including: 1) HPLC/SDS-PAGE purity profiles, 2) activity validation (e.g., TR-FRET or FP binding assays), 3) endotoxin levels (<1 EU/μg), and 4) batch-to-batch consistency reports. For inhibitors, request solubility data and validated IC50 values. Leading manufacturers include Cayman Chemical, Tocris, and Active Motif for small molecules; Sino Biological and Abcam for recombinant proteins. Bulk orders (10+ mg) typically offer 15-30% cost reductions. Consider requesting custom formulations (e.g., buffer composition) for specific assay requirements. Always verify export compliance for international shipments, as some BRD4 modulators may be subject to restrictions.
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