4DDQ

Structural plasticity of the Bacillus subtilis GyrA homodimer

Summary for 4DDQ

• Entry DOI: 10.2210/pdb4ddq/pdb
• Descriptor: DNA gyrase subunit A, POTASSIUM ION, 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL, ... (4 entities in total)
• Functional Keywords: topoisomerase ii, gyrase, supercoiling, dna-gate, c-gate, isomerase
• Biological source: Bacillus subtilis
• Cellular location: Cytoplasm : P05653
• Total number of polymer chains: 6
• Total formula weight: 340872.97

Authors

Rudolph, M.G.,Klostermeier, D. (deposition date: 2012-01-19, release date: 2013-02-13, Last modification date: 2023-09-13)

Primary citation

Rudolph, M.G.,Klostermeier, D.
Mapping the Spectrum of Conformational States of the DNA- and C-Gates in Bacillus subtilis Gyrase.
J.Mol.Biol., 425:2632-2640, 2013

PubMed Abstract: Type II DNA topoisomerases alter the supercoiling state of DNA in an ATP-dependent fashion that requires large conformational changes. The directionality of DNA strand transfer is controlled by three transient protein interfaces, termed the N-gate, DNA-gate, and C-gate. Bacterial gyrase is a type II DNA topoisomerase of A2B2 composition. The N-gate is formed by the two GyrB subunits and the GyrA subunits form the DNA- and C-gates. In structures of type II topoisomerase fragments, the DNA- and C-gates delimit a cavity for DNA and can be open or closed. However, the conformational space accessible has not yet been mapped. Here, we describe the crystal structure of the Bacillus subtilis DNA gyrase A subunit lacking the C-terminal DNA-wrapping domains. Five dimeric states of the GyrA N-terminal domain are observed, with their DNA- and C-gates either closed, or open to different extents. All of these conformations can in principle accommodate double-stranded DNA in the central cavity but only one conformation has its DNA-gate open wide enough for DNA to enter. The structure thus reflects the lower limit of DNA-gate opening that must occur during gyrase catalysis. The DNA-gate is formed by two flat surfaces, with few interactions. In contrast, the C-gate exhibits a highly undulated surface and forms a large number of interactions. None of the dimers in the crystal structures display an open C-gate that would allow DNA passage, in agreement with a transient opening of this gate during the catalytic cycle of DNA supercoiling.

PubMed: 23602808
DOI: 10.1016/j.jmb.2013.04.010

Experimental method

X-RAY DIFFRACTION (3.3 Å)