Technical Data
FKBP4 (FK506 Binding Protein 4, 59kD, FK506 binding protein 4, FKBP52, FKBP59, HBI, Hsp56, PPIase, p52, HSP binding immunophilin, T-cell FK506-binding protein, peptidylprolyl cis-trans isomerase, rotamase)
Hsp90 is crucial to cellular signaling by its regulation of the folding, activity, and stability of a wide range of client proteins. These client protein complexes may also contain one or more cochaperones (1). One class of Hsp90-binding cochaperone is composed of proteins with
a characteristic tetratricopeptide repeat (TPR) domain that forms an Hsp90 binding site. Among the TPR co-chaperones of Hsp90 are Hop/Sti1, protein phosphatase PP5, and members of both the FK506- and cyclosporin A- binding families of immunophilins (2). FK506-binding protein 51 (FKBP51) and FKBP52 are large molecular weight immunophilins that are part of the mature glucocorticoid receptor (GR) heterocomplex (3). The N terminal domain of each protein binds FK506 and has peptidyl-prolyl isomerase (PPIase) activity that converts prolyl peptide bonds within target proteins from cis- to trans- proline. The C-terminal domains contain the TPR repeats involved in protein-protein interactions with the Hsp90 (4). Although FKBP52 and FKBP51 share ~75% sequence similarity, they affect hormone binding by glucocorticoid receptor in opposing manners and have different Hsp90- binding characteristics (3, 5). Also, whereas FKBP51 typically has a role with the progesterone receptor, FKBP52 has been found to be linked to the progesterone, androgen and glucocorticoid receptors (5).

Positive Control:
Whole tissue extracts from rat kidney and rat and mouse testes.

Suitable for use in Western Blot, Immunoprecipitation and Immunohistochemistry. Other applications not tested.

Recommended Dilution:
Western Blot:1:2000
Optimal dilutions to be determined by the researcher.

Storage and Stability:
May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for at least 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
MabIgG110F700Affinity Purified
25ug-20CBlue IceHumanMouse
Synthetic peptide corresponding to the residues of human FKBP54.
Purified by Protein G affinity chromatography.
Supplied as a liquid in PBS in 0.09% sodium azide and 50% glycerol.
Recognizes human FKBP54. Species Crossreactivity: canine, hamster, rat.
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.
1. Cheung-Flynn J., Roberts P.J., Riggs D.L., and Smith D.F. (2003) J. Biol. Chem. 278(19): 17388-17394.
2. Davies T.H., Ning Y.N., and Sanchez E.R. (2002) J Biol. Chem. 277 (7): 4597-4600. 3. Wu, B. et al. (2004) Proc. Natl. Acad. Sci. USA. 101(22): 8348-8353. 4. Denny W.B., Prapapanich V., Smith D.F., and
Scammell J.G. (2005) Endocrinology 146(7):3194-3201. 5. Cox M.B. et al. (2007) Molecular Endocrinology. Epub.