2p7c
From Proteopedia
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|PDB= 2p7c |SIZE=350|CAPTION= <scene name='initialview01'>2p7c</scene> | |PDB= 2p7c |SIZE=350|CAPTION= <scene name='initialview01'>2p7c</scene> | ||
|SITE= | |SITE= | ||
| - | |LIGAND= | + | |LIGAND= <scene name='pdbligand=DA:2'-DEOXYADENOSINE-5'-MONOPHOSPHATE'>DA</scene>, <scene name='pdbligand=DC:2'-DEOXYCYTIDINE-5'-MONOPHOSPHATE'>DC</scene>, <scene name='pdbligand=DG:2'-DEOXYGUANOSINE-5'-MONOPHOSPHATE'>DG</scene>, <scene name='pdbligand=DT:THYMIDINE-5'-MONOPHOSPHATE'>DT</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= blaI, penI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1402 Bacillus licheniformis]) | |GENE= blaI, penI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1402 Bacillus licheniformis]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2p7c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2p7c OCA], [http://www.ebi.ac.uk/pdbsum/2p7c PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2p7c RCSB]</span> | ||
}} | }} | ||
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[[Category: repressor]] | [[Category: repressor]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 04:31:26 2008'' |
Revision as of 01:31, 31 March 2008
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| Ligands: | , , , | ||||||
| Gene: | blaI, penI (Bacillus licheniformis) | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Solution structure of the bacillus licheniformis BlaI monomeric form in complex with the blaP half-operator.
Overview
In absence of beta-lactam antibiotics, BlaI and MecI homodimeric repressors negatively control the expression of genes involved in beta-lactam resistance in Bacillus licheniformis and in Staphylococcus aureus. Subsequently to beta-lactam presence, BlaI/MecI is inactivated by a single-point proteolysis that separates its N-terminal DNA-binding domain to its C-terminal domain responsible for its dimerization. Concomitantly to this proteolysis, the truncated repressor acquires a low affinity for its DNA target that explains the expression of the structural gene for resistance. To understand the loss of the high DNA affinity of the truncated repressor, we have determined the different dissociation constants of the system and solved the solution structure of the B. licheniformis monomeric repressor complexed to the semi-operating sequence OP1 of blaP (1/2OP1blaP) by using a de novo docking approach based on inter-molecular nuclear Overhauser effects and chemical-shift differences measured on each macromolecular partner. Although the N-terminal domain of the repressor is not subject to internal structural rearrangements upon DNA binding, the molecules adopt a tertiary conformation different from the crystallographic operator-repressor dimer complex, leading to a 30 degrees rotation of the monomer with respect to a central axis extended across the DNA. These results open new insights for the repression and induction mechanisms of bacterial resistance to beta-lactams.
About this Structure
2P7C is a Single protein structure of sequence from Bacillus licheniformis. Full crystallographic information is available from OCA.
Reference
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., Boudet J, Duval V, Van Melckebeke H, Blackledge M, Amoroso A, Joris B, Simorre JP, Nucleic Acids Res. 2007;35(13):4384-95. Epub 2007 Jun 18. PMID:17576674
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