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Nucleic Acids Research, 2003, Vol. 31, No. 12 3236-3247
© 2003 Oxford University Press

The acidic C-terminal domain and A-box of HMGB-1 regulates p53-mediated transcription

Sourav Banerjee and Tapas K. Kundu

Transcription and Disease Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur, Bangalore 560064, India

*To whom correspondence should be addressed. Tel: +91 80 8462750 57; Fax: +91 80 8462766; Email: tapas{at}jncasr.ac.in

p53 function is modulated by several covalent and non-covalent modifiers. The architectural DNA- binding protein, High Mobility Group protein B-1 is a unique activator of p53. HMGB-1 protein is structured into two HMG-box domains, namely A-box and B-box, connected to a long highly acidic C-terminal domain. Here we report that both the C-terminal domain and A-box of HMGB-1 are critical for stimulation of p53-mediated DNA binding to its cognate site. Though deletion of these domains showed minimal effect in activation of p53-mediated transcription from the DNA template as compared to full-length HMGB-1, truncation of both the domains indeed showed significant reduction of transcriptional activation from the chromatin template as observed in DNA binding. Using transient transfection assays we showed that the C-terminal acidic domain and A-box of HMGB-1 are critical for the enhancement of the p53-mediated transactivation in vivo. Furthermore, the C-terminal domain and A-box deleted HMGB-1 could not activate p53-dependent apoptosis above the basal level. In conclusion, these results elucidate the role of acidic C-terminal domain and A-box of HMGB-1 in p53-mediated transcriptional activation and its further downstream effect.


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