2NS8 image
Entry Detail
PDB ID:
2NS8
Keywords:
Title:
How an in vitro selected peptide mimics the antibiotic tetracycline to induce TET repressor
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2006-11-03
Release Date:
2007-07-24
Method Details:
Experimental Method:
Resolution:
2.55 Å
R-Value Free:
0.27
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Tetracycline repressor protein
Mutations:C68S, C88N, C121T, C144S
Chain IDs:A, B, C, D
Chain Length:208
Number of Molecules:4
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Description:16 residue peptide Tip (Transcription inducing peptide)
Chain IDs:E (auth: H), F (auth: E), G (auth: F), H (auth: G), I (auth: Z)
Chain Length:17
Number of Molecules:5
Biological Source:synthetic construct
Ligand Molecules
Primary Citation
How an agonist peptide mimics the antibiotic tetracycline to induce Tet-repressor
J.Mol.Biol. 368 780 790 (2007)
PMID: 17374541 DOI: 10.1016/j.jmb.2007.02.030

Abstact

A 16-residue peptide, called Tip, induces the tetracycline repressor TetR as efficiently as the antibiotic tetracycline when fused to the N or C terminus of another protein. This is unusual because the majority of in vitro selected peptides, such as Tip, inhibit protein function, and agonist peptides are only rarely identified. We elucidated the atomic mechanism of TetR induction by Tip from crystal structures of TetR in complex with Tip and of free TetR. Peptide induction ultimately results in the same movements of DNA reading heads, but Tip accomplishes this by very different molecular interactions from tetracycline involving important contacts to the TetR surface. As a direct consequence, an alternate pathway of allostery becomes possible that makes ample use of intersubunit interactions. For the first time it is possible to show in atomic detail how a small molecule controlled bacterial transcription factor such as TetR becomes responsive to protein-protein interactions, characteristic of gene transcription regulation in higher organisms.

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Primary Citation of related structures