The Ca(2+)-dependent interaction of S100B(beta beta) with a peptide derived from p53 - PubMed
- ️Thu Jan 01 1998
. 1998 Feb 17;37(7):1951-60.
doi: 10.1021/bi972701n.
Affiliations
- PMID: 9485322
- DOI: 10.1021/bi972701n
The Ca(2+)-dependent interaction of S100B(beta beta) with a peptide derived from p53
R R Rustandi et al. Biochemistry. 1998.
Abstract
S100B(beta beta) was found to interact with the tumor suppressor protein, p53, and inhibit its PKC-dependent phosphorylation and tetramer formation [Baudier, J., Delphin, C., Grunwald, D., Khochbin, S., and Lawrence, J. J. (1992) Proc. Natl. Acad. Sci. U.S.A. 89, 11627-11631]. Since PKC-dependent phosphorylation at the C-terminus of p53 is known to effect transcription and p53 tetramer formation [Sakaguchi, K., Sakamoto, H., Lewis, M. S., Anderson, C. W., Erickson, J. W., Appella, E., and Xie, D. (1997) Biochemistry 36, 10117-10124], we examined the interaction of S100B(beta beta) with a peptide derived from the C-terminal regulatory domain of p53 (residues 367-388). In this paper, we report that S100B(beta beta) binds to the p53 peptide (CaK3 < or = 23.5 +/- 6.6 microM) in a Ca(2+)-dependent manner, and that the presence of the p53 peptide was found to increase the binding affinity of Ca2+ to S100B(beta beta) by 3-fold using EPR and PRR methods, whereas the peptide had no effect on Zn2+ binding to S100B(beta beta). Fluorescence and NMR spectroscopy experiments show that the p53 peptide binds to a region of S100B(beta beta) that probably includes residues in the "hinge" (S41, L44, E45, E46, I47), C-terminal loop (A83, C84, H85, E86, F87, F88), and helix 3 (V52, V53, V56, T59). Together these data support the notion that S100B(beta beta) inhibits PKC-dependent phosphorylation by binding directly to the C-terminus of p53.
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