5Z49 image
Deposition Date 2018-01-10
Release Date 2018-10-10
Last Version Date 2023-11-22
Entry Detail
PDB ID:
5Z49
Keywords:
TRANSCRIPTION
Title:
Crystal structure of the effector-binding domain of Synechococcus elongatus CmpR in complex with ribulose-1,5-bisphosphate
Biological Source:
Source Organism:
Synechococcus elongatus PCC 7942 (Taxon ID: 1140)
Host Organism:
Escherichia coli BL21(DE3)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.15 Å
R-Value Free:
0.24
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 21 21 21
5Z49 validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:HTH-type transcriptional activator CmpR
Gene (Uniprot):cmpR
Chain IDs:A (auth: B), B (auth: A)
Chain Length:239
Number of Molecules:2
Biological Source:Synechococcus elongatus PCC 7942
UniProt ID:Q9F1R2 Pfam ID:PF03466
Ligand Molecules
RUB
Primary Citation
Crystal structure of the effector-binding domain of Synechococcus elongatus CmpR in complex with ribulose 1,5-bisphosphate.
Acta Crystallogr F Struct Biol Commun 74 506 511 (2018)
PMID: 30084400 DOI: 10.1107/S2053230X18008841

Abstact

The CO2-concentrating mechanism (CCM) has evolved to improve the efficiency of photosynthesis in autotrophic cyanobacteria. CmpR, a LysR-type transcriptional regulator (LTTR) from Synechococcus elongatus PCC 7942, was found to regulate CCM-related genes under low-CO2 conditions. Here, the dimeric structure of the effector-binding domain of CmpR (CmpR-EBD) in complex with the co-activator ribulose 1,5-bisphosphate (RuBP) is reported at 2.15 Å resolution. One RuBP molecule binds to the inter-domain cleft between the two subunits of the CmpR-EBD dimer. Structural comparison combined with sequence analyses demonstrated that CmpR-EBD has an overall structure similar to those of LTTRs of known structure, but possesses a distinctly different effector-binding pattern.

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Primary Citation of related structures
5Z49