Primary Citation of Related Structures: 2TRT, 2XB5
PubMed Abstract:
The most frequently occurring resistance of Gram-negative bacteria against tetracyclines is triggered by drug recognition of the Tet repressor. This causes dissociation of the repressor-operator DNA complex and enables expression of the resistance protein TetA, which is responsible for active efflux of tetracycline ...
The most frequently occurring resistance of Gram-negative bacteria against tetracyclines is triggered by drug recognition of the Tet repressor. This causes dissociation of the repressor-operator DNA complex and enables expression of the resistance protein TetA, which is responsible for active efflux of tetracycline. The 2.5 angstrom resolution crystal structure of the homodimeric Tet repressor complexed with tetracycline-magnesium reveals detailed drug recognition. The orientation of the operator-binding helix-turn-helix motifs of the repressor is inverted in comparison with other DNA binding proteins. The repressor-drug complex is unable to interact with DNA because the separation of the DNA binding motifs is 5 angstroms wider than usually observed.
Related Citations:
Identification and Nucleotide Sequence of the Class E Tet Regulatory Elements and Operator and Inducer Binding of the Encoded Purified Tet Repressor Tovar, K., Ernst, A., Hillen, W. (1988) Mol Gen Genet 215: 76
Organizational Affiliation:
Institut für Kristallographie, Freie Universität Berlin, Germany.
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