Solution structure of the bacillus licheniformis BlaI monomeric form in complex with the blaP half-operator.

Conformational and thermodynamic changes of the repressor/DNA operator complex upon monomerization shed new light on regulation mechanisms of bacterial resistance against beta-lactam antibiotics.

Regulatory protein blaI, Beta-lactamase repressor protein

MKKIPQISDAELEVMKVIWKHSSINTNEVIKELSKTSTWSPKTIQTMLLRLIKKGALNHHKEGRVFVYTPNIDESDYIEV
KS

Chemically synthetized bacillus licheniformis blaP half-operator

The structure was determined using a de novo docking approach.

structures used for refinement were generated from the docking procedure started with intermolecular nOe and ambiguous distance restraints proceeding from chemical shift mapping.
simulated annealing from randomized coordinates followed by restrained molecular dynamics.

2mM 13C,15N BlaI-NTD repressor in complex with blaP half-operator; 50mM NaH2PO4/Na2HPO4, 200mM KCl, 1mM EDTA, 1mM NaN3

0.1mM 13C,15N BlaI-NTD repressor; 50mM NaH2PO4/Na2HPO4, 200mM KCl, 1mM EDTA, 1mM NaN3

PROTEIN-DNA COMPLEX, REPRESSOR, MONOMER, OPERATOR, ANTIBIOTICS, transcription regulator