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Transcription Initiation Factor IIB (TFIIB) is an essential factor for transcription by RNA Polymerase II. TFIIB localizes to the nucleus where it forms a complex (the DAB complex) with transcription factor IID and IIA. TFIIB plays a role as a bridge between IID, which initially recognizes the promoter sequence, and RNA polymerase II. TFIIB is involved in the selection of transcription start site.

| Pack Size | Price | USA Warehouse | Global Warehouse | Quantity |
|---|---|---|---|---|
| 5 μg | $112 | 7-10 days | 7-10 days | |
| 10 μg | $183 | 7-10 days | 7-10 days | |
| 20 μg | $292 | 7-10 days | 7-10 days | |
| 50 μg | $545 | 7-10 days | 7-10 days | |
| 100 μg | $792 | 7-10 days | 7-10 days | |
| 200 μg | $1,150 | 7-10 days | 7-10 days | |
| 500 μg | $1,900 | 7-10 days | 7-10 days | |
| 1 mg | $2,730 | 7-10 days | 7-10 days |
| Biological Activity | Activity has not been tested. It is theoretically active, but we cannot guarantee it. If you require protein activity, we recommend choosing the eukaryotic expression version first. |
| Description | Transcription Initiation Factor IIB (TFIIB) is an essential factor for transcription by RNA Polymerase II. TFIIB localizes to the nucleus where it forms a complex (the DAB complex) with transcription factor IID and IIA. TFIIB plays a role as a bridge between IID, which initially recognizes the promoter sequence, and RNA polymerase II. TFIIB is involved in the selection of transcription start site. |
| Species | Human |
| Expression System | E. coli |
| Tag | N-GST |
| Accession Number | Q00403 |
| Synonyms | Transcription Initiation Factor IIB,TFIIB,TF2B,S300-II,GTF2B,General Transcription Factor TFIIB |
| Amino Acid | Met1-Leu316 |
| Construction | Met1-Leu316 |
| Protein Purity | Greater than 81% as determined by reducing SDS-PAGE. (QC verified) |
| Molecular Weight | 62 KDa (reducing condition) |
| Endotoxin | < 0.1 ng/µg (1 EU/µg) as determined by LAL test. |
| Formulation | Lyophilized from a solution filtered through a 0.22 μm filter, containing 20 mM Tris-HCl, 100 mM NaCl, pH 8.0. |
| Reconstitution | Reconstitute the lyophilized protein in distilled water. The product concentration should not be less than 100 μg/ml. Before opening, centrifuge the tube to collect powder at the bottom. After adding the reconstitution buffer, avoid vortexing or pipetting for mixing. |
| Stability & Storage | Lyophilized powders can be stably stored for over 12 months, while liquid products can be stored for 6-12 months at -80°C. For reconstituted protein solutions, the solution can be stored at -20°C to -80°C for at least 3 months. Please avoid multiple freeze-thaw cycles and store products in aliquots. |
| Shipping | In general, Lyophilized powders are shipping with blue ice. Solutions are shipping with dry ice. |
| Research Background | Transcription Initiation Factor IIB (TFIIB) is an essential factor for transcription by RNA Polymerase II. TFIIB localizes to the nucleus where it forms a complex (the DAB complex) with transcription factor IID and IIA. TFIIB plays a role as a bridge between IID, which initially recognizes the promoter sequence, and RNA polymerase II. TFIIB is involved in the selection of transcription start site. |
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