Genomic organization, chromosomal localization, and promoter of human gene for FK506-binding protein 12.6

Tetsuya Nakazawa, Shin Takasawa, Naoya Noguchi, Koji Nata, Akira Tohgo, Mitsuko Mori, Kan Ichi Nakagawara, Takako Akiyama, Takayuki Ikeda, Akiyo Yamauchi, Iwao Takahashi, Takeo Yoshikawa, Hiroshi Okamoto

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Cyclic ADP-ribose (cADPR) induces the release of Ca2+ from microsomes of pancreatic islets for insulin secretion. It has been demonstrated that cADPR binds to FK506-binding protein 12.6 (FKBP 12.6) on rat islet ryanodine receptor and that the binding of cADPR to FKBP12.6 frees the ryanodine receptor from FKBP12.6, causing it to release Ca2+ [Noguchi, N., Takasawa, S., Nata, K., Tohgo, A., Kato, I., Ikehata, F., Yonekura, H., Okamoto, H., 1997. Cyclic ADP-ribose binds to FK506-binding protein to release Ca 2+ from islet microsomes. J. Biol. Chem. 272, 3133-3136.]. In this study, we cloned, characterized the structural organization of the human FKBP12.6, which is highly homologous to human FKBP12, and analyzed the promoters for FKBP12.6 and FKBP12. Human FKBP12.6 gene spanned about 16 kb in length and consisted of four exons and three introns. The positions of exon-intron junction of the FKBP12.6 gene were perfectly matched with those of FKBP12 gene except that FKBP12 has an additional exon, exon V, to code exclusively for 3′-UTR. Fluorescence in situ hybridization revealed that the FKBP12.6 gene was located on chromosome 2 p21-23, which is different from the locus (chromosome 20 p13) of the FKBP12 gene. Reporter gene analyses revealed that the regions of - 58 ∼ - 24 of FKBP12.6 and - 106 ∼ - 79 of FKBP12 are important for promoter activities. The promoters contain a consensus transcription factor binding sequence for Sp family in FKBP12.6 and Ets-1 in FKBP12. Electrophoretic mobility shift assays showed that nuclear proteins bind to the promoters. The DNA/protein complex on FKBP12.6 promoter was competed out by Sp1 consensus probe and the complex was supershifted by anti-Sp3 antibodies. On the other hand, the DNA/protein complex on FKBP12 promoter was competed out by Ets-1 consensus probe but not by its mutant probe, indicating that Sp3 and Ets-1 play an essential role in transcription of FKBP12.6 and FKBP12, respectively.

Original languageEnglish
Pages (from-to)55-64
Number of pages10
Issue number1
Publication statusPublished - 2005 Oct 24


  • Cyclic ADP-ribose
  • FKBP12
  • FKBP12.6
  • Gene structure
  • Promoter assay
  • Ryanodine receptor

ASJC Scopus subject areas

  • Genetics


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