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Gene Review

FKBP1A  -  FK506 binding protein 1A, 12kDa

Bos taurus

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Disease relevance of FKBP1B


High impact information on FKBP1B

  • Microsequencing of peptide fragments from a cyanogen bromide digest of p78 identified this protein as BiP and sequence analysis identified p74 as the peptidyl-prolyl cis-trans isomerase, FKPB65 [3].
  • Results from this study provide the first identification of a ligand for an FKBP in the secretory pathway and suggest that the prolyl cis-trans isomerase activity of FKBP65 may be important for the proper folding of the proline-rich tropoelastin molecule before secretion [3].
  • Rapamycin, which binds specifically to FKBP12 binding protein, distributes evenly through the artery, whereas paclitaxel, which binds specifically to microtubules, remains primarily in the subintimal space [4].
  • We report a novel group of dual-family immunophilins that contain both CyP and FKBP domains for which we propose the name FCBP (FK506- and cyclosporin-binding protein) [1].
  • Prior to this report, all other FKBP family members had been irrelevant to the mechanism of action of FK-506 because no other FKBP.FK-506 complexes were able to bind and inhibit calcineurin [5].

Biological context of FKBP1B


Anatomical context of FKBP1B


Associations of FKBP1B with chemical compounds

  • It was completely inhibited by concentrations of cyclosporin A above 0.1 microM, but not by FK506 or rapamycin, and probably represented one or more cyclophilins [6].
  • [3H]FK506-FK506-binding protein (FKBP) complex does not bind polyethyleneimine-treated glass fiber filters, on the other hand, it binds the filter when it makes a complex with calcineurin [12].
  • By Western blot analysis, arginine N-methyltransferase (PRMT1) and FK506 binding protein (FKBP) were detected in the SR used for reconstitution of RyR [13].
  • These results suggest that protein methylation activates RyR/Ca(2+) release channels and may participate in the control of intracellular Ca(2+) mobilization in CASM cells by transferring a methyl group to the arginine moiety of the RyR accessory protein, FKBP 12 [13].

Physical interactions of FKBP1B


Regulatory relationships of FKBP1B

  • FK506 and FKBP-12 inhibited calcineurin in a concentration-dependent manner, and complete inhibition of the phosphatase activity appeared to require a molar excess of FKBP12-FK506 complex [7].

Other interactions of FKBP1B


Analytical, diagnostic and therapeutic context of FKBP1B

  • To understand the structural basis of these findings, we have determined the three-dimensional structure of the complex of yeast FKBP12 with FK-506 by x-ray crystallography, and have found that the structure of the yeast complex is strikingly similar to its human homolog [15].
  • We find, however, that the complex of yeast FKBP12 with L-685,818, a well characterized antagonist of FK-506 immunosuppression, is a potent inhibitor of calcineurin [15].
  • The expression of a 12-kDa FKBP was greater in subconfluent cells than in confluent cells as determined by Western blotting, suggesting that the 12-kDa FKBP may be one of the factors that regulates Ca2+ oscillations [16].
  • Immunocytochemistry revealed the existence of cytoplasmic FKBP-like immunoreactivities [16].


  1. A novel class of dual-family immunophilins. Adams, B., Musiyenko, A., Kumar, R., Barik, S. J. Biol. Chem. (2005) [Pubmed]
  2. The 28.3 kDa FK506 binding protein from a thermophilic archaeum, Methanobacterium thermoautotrophicum, protects the denaturation of proteins in vitro. Ideno, A., Yoshida, T., Furutani, M., Maruyama, T. Eur. J. Biochem. (2000) [Pubmed]
  3. Identification of tropoelastin as a ligand for the 65-kD FK506-binding protein, FKBP65, in the secretory pathway. Davis, E.C., Broekelmann, T.J., Ozawa, Y., Mecham, R.P. J. Cell Biol. (1998) [Pubmed]
  4. Specific binding to intracellular proteins determines arterial transport properties for rapamycin and paclitaxel. Levin, A.D., Vukmirovic, N., Hwang, C.W., Edelman, E.R. Proc. Natl. Acad. Sci. U.S.A. (2004) [Pubmed]
  5. Inhibition of calcineurin by a novel FK-506-binding protein. Sewell, T.J., Lam, E., Martin, M.M., Leszyk, J., Weidner, J., Calaycay, J., Griffin, P., Williams, H., Hung, S., Cryan, J. J. Biol. Chem. (1994) [Pubmed]
  6. Roles of peptidyl-prolyl cis-trans isomerase and calcineurin in the mechanisms of antimalarial action of cyclosporin A, FK506, and rapamycin. Bell, A., Wernli, B., Franklin, R.M. Biochem. Pharmacol. (1994) [Pubmed]
  7. FKBP12-FK506 complex inhibits phosphatase activity of two mammalian isoforms of calcineurin irrespective of their substrates or activation mechanisms. Mukai, H., Kuno, T., Chang, C.D., Lane, B., Luly, J.R., Tanaka, C. J. Biochem. (1993) [Pubmed]
  8. Complete amino acid sequence of the FK506 and rapamycin binding protein, FKBP, isolated from calf thymus. Lane, W.S., Galat, A., Harding, M.W., Schreiber, S.L. J. Protein Chem. (1991) [Pubmed]
  9. Characterization of cytosolic cyclophilin from guard cells of Vicia faba L. Kinoshita, T., Shimazaki, K. Plant Cell Physiol. (1999) [Pubmed]
  10. FK506 inhibits Cl- secretion in airway epithelium via calcineurin-independent mechanism. Kanoh, S., Kondo, M., Tamaoki, J., Kobayashi, H., Motoyoshi, K., Nagai, A. Eur. J. Pharmacol. (2001) [Pubmed]
  11. The characterization of a cyclophilin-type peptidyl prolyl cis-trans-isomerase from the endoplasmic-reticulum lumen. Bose, S., Mücke, M., Freedman, R.B. Biochem. J. (1994) [Pubmed]
  12. Detection of the FK506-FKBP-calcineurin complex by a simple binding assay. Asami, M., Kuno, T., Mukai, H., Tanaka, C. Biochem. Biophys. Res. Commun. (1993) [Pubmed]
  13. Protein methylation activates reconstituted ryanodine receptor-ca release channels from coronary artery myocytes. Chen, Y.F., Zhang, A.Y., Zou, A.P., Campbell, W.B., Li, P.L. J. Vasc. Res. (2004) [Pubmed]
  14. Specific interaction between bovine cyclophilin A and synthetic analogues of cyclolinopeptide A. Gallo, P., Rossi, F., Saviano, M., Pedone, C., Colonna, G., Ragone, R. J. Biochem. (1998) [Pubmed]
  15. Improved calcineurin inhibition by yeast FKBP12-drug complexes. Crystallographic and functional analysis. Rotonda, J., Burbaum, J.J., Chan, H.K., Marcy, A.I., Becker, J.W. J. Biol. Chem. (1993) [Pubmed]
  16. Effect of FK506 on ATP-induced intracellular calcium oscillations in cow tracheal epithelium. Kanoh, S., Kondo, M., Tamaoki, J., Shirakawa, H., Aoshiba, K., Miyazaki, S., Kobayashi, H., Nagata, N., Nagai, A. Am. J. Physiol. (1999) [Pubmed]
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