1hu8

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spinqualitylabelsall models 1hu8, resolution 2.7Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

CRYSTAL STRUCTURE OF THE MOUSE P53 CORE DNA-BINDING DOMAIN AT 2.7A RESOLUTION

Overview

The p53 tumor suppressor is a sequence-specific DNA-binding protein that, activates transcription in response to DNA damage to promote cell cycle, arrest or apoptosis. The p53 protein functions in a tetrameric form in, vivo and contains four domains including an N-terminal transcriptional, activation domain, a C-terminal regulatory domain, a tetramerization, domain, and a central core DNA-binding domain that is the site of the, majority of tumor-derived mutations. Here we report the 2.7-A crystal, structure of the mouse p53 core domain. Like the human p53 core domain in, complex with DNA, the mouse p53 core domain adopts an immunoglobulin-like, beta sandwich architecture with a series of loops and short helices at, opposite ends of the beta sandwich. Comparison of the DNA-bound and, DNA-free p53 core domains reveals that while the central beta sandwich, architecture remains largely unchanged, a loop region important for DNA, binding undergoes significant rearrangement. Although this loop region, mediates major groove DNA contacts in the DNA-bound structure, it adopts a, conformation that is incompatible with DNA binding in the DNA-free, structure. Interestingly, crystals of the DNA-free core domain contain a, noncrystallographic trimer with three nearly identical subunit-subunit, (dimer) contacts. These dimer contacts align the p53 core domains in a way, that is incompatible with simultaneous DNA binding by both protomers of, the dimer. Surprisingly, similar dimer contacts are observed in crystals, of the human p53 core domain with DNA in which only one of the three p53, protomers in the asymmetric unit cell is specifically bound to DNA. We, propose that the p53 core domain dimer that is seen in the crystals, described here represents a physiologically relevant inactive form of p53, that must undergo structural rearrangement for sequence-specific DNA, binding.

About this Structure

1HU8 is a Single protein structure of sequence from Mus musculus with ZN as ligand. Full crystallographic information is available from OCA.

Reference

Crystal structure of the mouse p53 core DNA-binding domain at 2.7 A resolution., Zhao K, Chai X, Johnston K, Clements A, Marmorstein R, J Biol Chem. 2001 Apr 13;276(15):12120-7. Epub 2001 Jan 4. PMID:11152481

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