Product Pathways - Chromatin Regulation / Epigenetics
SPT5 Antibody #9033
|9033S||100 µl (10 western blots)||---||In Stock||---|
|9033||carrier free and custom formulation / quantity||email request|
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|W||1:1000||Human, Mouse, Rat, Monkey||Endogenous||150||Rabbit|
Species cross-reactivity is determined by western blot.
Applications Key: W=Western Blotting
Species predicted to react based on 100% sequence homology: Hamster, Bovine, Dog, Guinea Pig, Horse.
Specificity / Sensitivity
SPT5 Antibody recognizes endogenous levels of total SPT5 protein.
Source / Purification
Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Gly803 of human SPT5 protein. Antibodies are purified by protein A and peptide affinity chromatography.
DRB-sensitivity inducing factor (DSIF), a heterodimer composed of SPT4 and SPT5, is capable of both facilitating and inhibiting RNA polymerase II (RNAPII) activity (1-3). DSIF, together with NELF (Negative Elongation Factor), inhibits RNAPII elongation, resulting in promoter proximal pausing of RNAPII as it awaits additional signaling to resume transcription (4). The release of promoter proximal pausing is signaled through phosphorylation of the RNAPII C-terminal domain (CTD) and NELF by positive transcription elongation factor (P-TEFb) (5). P-TEFb also phosphorylates SPT5 at Thr4 within the evolutionarily conserved heptapeptide repeat motif. This phosphorylation event switches DSIF from a transcriptional repressor to an activator where it becomes a critical factor for transcriptional elongation (6,7).
- Wada, T. et al. (1998) Genes Dev 12, 343-56.
- Saunders, A. et al. (2006) Nat Rev Mol Cell Biol 7, 557-67.
- Gomes, N.P. et al. (2006) Genes Dev 20, 601-12.
- Yamaguchi, Y. et al. (1999) Cell 97, 41-51.
- Buratowski, S. (2009) Mol Cell 36, 541-6.
- Wada, T. et al. (1998) EMBO J 17, 7395-403.
- Yamada, T. et al. (2006) Mol Cell 21, 227-37.
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