2FF4 image
Entry Detail
PDB ID:
2FF4
Keywords:
Title:
Mycobacterium tuberculosis EmbR in complex with low affinity phosphopeptide
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-12-19
Release Date:
2006-01-24
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.23
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Probable regulatory protein embR
Chain IDs:A, B
Chain Length:388
Number of Molecules:2
Biological Source:Mycobacterium tuberculosis
Polymer Type:polypeptide(L)
Description:DNA repair protein RAD9
Chain IDs:C (auth: E), D (auth: F)
Chain Length:9
Number of Molecules:2
Biological Source:
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
TPO C THR PHOSPHOTHREONINE
Primary Citation
Molecular structure of EmbR, a response element of Ser/Thr kinase signaling in Mycobacterium tuberculosis.
Proc.Natl.Acad.Sci.Usa 103 2558 2563 (2006)
PMID: 16477027 DOI: 10.1073/pnas.0507766103

Abstact

Ser/Thr phosphorylation has emerged as a critical regulatory mechanism in a number of bacteria, including Mycobacterium tuberculosis. This problematic pathogen encodes 11 eukaryotic-like Ser/Thr kinases, yet few substrates or signaling targets have been characterized. Here, we report the structure of EmbR (2.0 A), a putative transcriptional regulator of key arabinosyltransferases (EmbC, -A, and -B), and an endogenous substrate of the Ser/Thr-kinase PknH. EmbR presents a unique domain architecture: the N-terminal winged-helix DNA-binding domain forms an extensive interface with the all-helical central bacterial transcriptional activation domain and is positioned adjacent to the regulatory C-terminal forkhead-associated (FHA) domain, which mediates binding to a Thr-phosphorylated site in PknH. The structure in complex with a phospho-peptide (1.9 A) reveals a conserved mode of phospho-threonine recognition by the FHA domain and evidence for specific recognition of the cognate kinase. The present structures suggest hypotheses as to how EmbR might propagate the phospho-relay signal from its cognate kinase, while serving as a template for the structurally uncharacterized Streptomyces antibiotic regulatory protein family of transcription factors.

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