Cell Signaling Technology
XP Monoclonal Antibody

Product Pathways - Translational Control

Phospho-S6 Ribosomal Protein (Ser240/244) (D68F8) XP® Rabbit mAb (Alexa Fluor® 647 Conjugate) #5044

Applications Reactivity Sensitivity Isotype
F H M R Mk Endogenous Rabbit IgG

Applications Key:  F=Flow Cytometry
Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

Phospho-S6 Ribosomal Protein (Ser240/244) (D68F8) XP® Rabbit mAb (Alexa Fluor® 647 Conjugate) detects endogenous levels of S6 Ribosomal Protein only when phosphorylated at Ser240/244.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser240/244 of human S6 Ribosomal Protein.

Flow Cytometry

Flow Cytometry

Flow cytometric analysis of Jurkat cells, untreated (green) or treated with LY294002 (PI3 Kinase Inhibitor) #9901, Wortmannin #9951 and U0126 (MEK1/2 Inhibitor) #9903 (blue), using Phospho-S6 Ribosomal Protein (Ser240/244) (D68F8) XP® Rabbit mAb (Alexa Fluor® 647 Conjugate).

Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 647 fluorescent dye and tested in-house for direct flow cytometry in human cells. The antibody is expected to exhibit the same species cross-reactivity as the unconjugated antibody Phospho-S6 Ribosomal Protein (Ser240/244) (D68F8) XP® Rabbit mAb #5364.

Background

One way that growth factors and mitogens effectively promote sustained cell growth and proliferation is by upregulating mRNA translation (1,2). Growth factors and mitogens induce the activation of p70 S6 kinase and the subsequent phosphorylation of the S6 ribosomal protein. Phosphorylation of S6 ribosomal protein correlates with an increase in translation of mRNA transcripts that contain an oligopyrimidine tract in their 5' untranslated regions (2). These particular mRNA transcripts (5'TOP) encode proteins involved in cell cycle progression, as well as ribosomal proteins and elongation factors necessary for translation (2,3). Important S6 ribosomal protein phosphorylation sites include several residues (Ser235, Ser236, Ser240, and Ser244) located within a small, carboxy-terminal region of the S6 protein (4,5).

  1. Dufner, A. and Thomas, G. (1999) Exp. Cell Res. 253, 100-109.
  2. Peterson, R.T. and Schreiber, S.L. (1998) Curr. Biol. 8, R248-R250.
  3. Jefferies, H.B. et al. (1997) EMBO J. 16, 3693-3704.
  4. Ferrari, S. et al. (1991) J. Biol. Chem. 266, 22770-22775.
  5. Flotow, H. and Thomas, G. (1992) J. Biol. Chem. 267, 3074-3078.

Application References

Have you published research involving the use of our products? If so we'd love to hear about it. Please let us know!

For Research Use Only. Not For Use In Diagnostic Procedures.

Products