5XXP
Crystal structure of CbnR_DBD-DNA complex
Summary for 5XXP
| Entry DOI | 10.2210/pdb5xxp/pdb |
| Descriptor | LysR-type regulatory protein, DNA (25-MER), ... (4 entities in total) |
| Functional Keywords | dna complex, dna binding domain, dna binding protein |
| Biological source | Cupriavidus necator (Alcaligenes eutrophus) More |
| Total number of polymer chains | 4 |
| Total formula weight | 37998.72 |
| Authors | |
| Primary citation | Koentjoro, M.P.,Adachi, N.,Senda, M.,Ogawa, N.,Senda, T. Crystal structure of the DNA-binding domain of the LysR-type transcriptional regulator CbnR in complex with a DNA fragment of the recognition-binding site in the promoter region FEBS J., 285:977-989, 2018 Cited by PubMed Abstract: LysR-type transcriptional regulators (LTTRs) are among the most abundant transcriptional regulators in bacteria. CbnR is an LTTR derived from Cupriavidus necator (formerly Alcaligenes eutrophus or Ralstonia eutropha) NH9 and is involved in transcriptional activation of the cbnABCD genes encoding chlorocatechol degradative enzymes. CbnR interacts with a cbnA promoter region of approximately 60 bp in length that contains the recognition-binding site (RBS) and activation-binding site (ABS). Upon inducer binding, CbnR seems to undergo conformational changes, leading to the activation of the transcription. Since the interaction of an LTTR with RBS is considered to be the first step of the transcriptional activation, the CbnR-RBS interaction is responsible for the selectivity of the promoter to be activated. To understand the sequence selectivity of CbnR, we determined the crystal structure of the DNA-binding domain of CbnR in complex with RBS of the cbnA promoter at 2.55 Å resolution. The crystal structure revealed details of the interactions between the DNA-binding domain and the promoter DNA. A comparison with the previously reported crystal structure of the DNA-binding domain of BenM in complex with its cognate RBS showed several differences in the DNA interactions, despite the structural similarity between CbnR and BenM. These differences explain the observed promoter sequence selectivity between CbnR and BenM. Particularly, the difference between Thr33 in CbnR and Ser33 in BenM appears to affect the conformations of neighboring residues, leading to the selective interactions with DNA. PubMed: 29323785DOI: 10.1111/febs.14380 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.55 Å) |
Structure validation
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