FKBP51 (FK506 binding protein 5, FK506-binding protein, 54kD progesterone receptor-associated immunophilin, AIG6, Androgen-regulated protein 6, FF1 antigen, FKBP-51, FKBP54, HSP90-binding immunophilin, MGC111006, P54, Peptidyl-prolyl cis-trans isomerase,

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 \na characteristic tetratricopeptide repeat (TPR) domain that forms an Hsp90 binding site. Among the TPR cochaperones 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 \nmature 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). FK506 binding protein 51kD (FKBP51 or otherwise referred to as FKBP54) has been identified as a progestininducible gene. This protein is predominantly expressed in murine T cells but in humans, it is abundantly expressed in numerous tissues at levels many times higher than FKBP12. The FKBP51 gene is known to be induced by glucocorticoids (5). \n\nPositive Control:\nwhole tissue extracts from rat kidney and rat and mouse testes. \n \nApplications:\nSuitable for use in Western Blot. Other applications not tested.\n\nRecommended Dilution:\nWestern Blot: 1:2000\nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. 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.

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SPECIFICATIONS

Catalog Number

F4150-18

Size

25ug

Applications

WB

Hosts

Mouse

Reactivities

Hum, Mouse, Rat, Can, Rabbit

Form

Supplied as a liquid in PBS, 0.09% sodium azide, 50% glycerol.

P Type

Mab

Purity

Purified by immunoaffinity chromatography.

Isotype

IgG

References

1. Cheung-Flynn J., Roberts P.J., Riggs D.L., and Smith D.F.(2003) J. Biol. Chem. 278(19): 17388-17394. \n2. 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 \nScammell J.G. (2005) Endocrinology 146(7): 3194-3201. 5. Hubler T.R. et al. (2003) Endocrinology 144(6): 2380- 2387.

Additional Info

Recognizes human FkBP51. Species Crossreactivity: canine, hamster, human, mouse, rat, rabbit.