5DY0

Crystal of AmtR from Corynebacterium glutamicum in complex with DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of AmtR, the global nitrogen regulator of Corynebacterium glutamicum, in free and DNA-bound forms.

Palanca, C.Rubio, V.

(2016) FEBS J 283: 1039-1059

  • DOI: 10.1111/febs.13643
  • Primary Citation of Related Structures:  
    5DXZ, 5DY1, 5DY0

  • PubMed Abstract: 
  • Corynebacterium glutamicum is a bacterium used for industrial amino acid production, and understanding its metabolic pathway regulation is of high biotechnological interest. Here, we report crystal structures of AmtR, the global nitrogen regulator of C. glutamicum, in apo (2 ...

    Corynebacterium glutamicum is a bacterium used for industrial amino acid production, and understanding its metabolic pathway regulation is of high biotechnological interest. Here, we report crystal structures of AmtR, the global nitrogen regulator of C. glutamicum, in apo (2.25-Å and 2.65-Å resolution) and DNA-bound (3-Å resolution) forms. These structures reveal an all-α homodimeric TetR family regulator composed of a helix-turn-helix-hosting N-terminal DNA-binding domain and a C-terminal dimerization domain. AmtR has several unique structural features that appear to be invariant among AmtR proteins, which may be related to its regulation by the nitrogen-sensing trimeric protein GlnK rather than by small-molecule effectors. As compared with other TetR family members, AmtR has an extra C-terminal helix, a large extended external loop that resembles the flexible tranducer T-loop of GlnK in sequence, and a large open cavity towards the intersubunit region that changes shape upon DNA binding. The marked kinking of helix 4 decreases in the DNA-bound form. The binding of one AmtR dimer to its DNA operator involves not only the insertion of helices 3 and 3' in adjacent turns of the double-helix major groove, but also the anchoring of 19-residue, arginine-rich and proline-rich N-terminal extensions to two external minor grooves. Electrophoretic mobility shift assays with a deletion mutant reveal that the 19-residue extension is crucial for AmtR binding to DNA. N-extension anchoring explains the flanking by AT sequences of the recognized target DNA sequence core. The significance of these findings for the entire TetR family of regulators and for GlnK regulation of AmtR is discussed.


    Organizational Affiliation

    Group 739 of the Centro de Investigación Biomédica en Red sobre Enfermedades Raras (CIBERER) del Instituto de Salud Carlos III, Spain.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TetR family transcriptional regulator ABCD230Corynebacterium glutamicumMutation(s): 0 
Gene Names: KIQ_008455
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
DNAE, F, G, H26Corynebacterium glutamicum
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: P 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.731α = 90
b = 137.423β = 90
c = 239.874γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2015-09-24 
  • Released Date: 2016-01-13 
  • Deposition Author(s): Palanca, C., Rubio, V.

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-13
    Type: Initial release
  • Version 1.1: 2016-01-20
    Changes: Database references
  • Version 1.2: 2016-03-30
    Changes: Database references