Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 27.07 kDa 
• Atom Count: 1839 
• Modelled Residue Count: 225 
• Deposited Residue Count: 238 
• Unique protein chains: 1

2GWR

Crystal structure of the response regulator protein mtrA from Mycobacterium Tuberculosis

• DOI: 10.2210/pdb2GWR/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Mycobacterium tuberculosis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-05-05 Released: 2006-05-23 
• Deposition Author(s): Friedland, N., Mack, T.R., Yu, M., Bursey, E.H., Hung, L.W., Stock, A.M., Waldo, G.S., Terwilliger, T.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.244 
• R-Value Work: 0.204 
• R-Value Observed: 0.204 

Literature

Domain orientation in the inactive response regulator Mycobacterium tuberculosis MtrA provides a barrier to activation.

Friedland, N., Mack, T.R., Yu, M., Hung, L.W., Terwilliger, T.C., Waldo, G.S., Stock, A.M.

(2007) Biochemistry 46: 6733-6743

• PubMed: 17511470 
• DOI: 10.1021/bi602546q
• Primary Citation of Related Structures:  
  2GWR


• PubMed Abstract: 
  

The structure of MtrA, an essential gene product for the human pathogen Mycobacterium tuberculosis, has been solved to a resolution of 2.1 A. MtrA is a member of the OmpR/PhoB family of response regulators and represents the fourth family member for which a structure of the protein in its inactive state has been determined. As is true for all OmpR/PhoB family members, MtrA possesses an N-terminal regulatory domain and a C-terminal winged helix-turn-helix DNA-binding domain, with phosphorylation of the regulatory domain modulating the activity of the protein. In the inactive form of MtrA, these two domains form an extensive interface that is composed of the alpha4-beta5-alpha5 face of the regulatory domain and the C-terminal end of the positioning helix, the trans-activation loop, and the recognition helix of the DNA-binding domain. This domain orientation suggests a mechanism of mutual inhibition by the two domains. Activation of MtrA would require a disruption of this interface to allow the alpha4-beta5-alpha5 face of the regulatory domain to form the intermolecule interactions that are associated with the active state and to allow the recognition helix to interact with DNA. Furthermore, the interface appears to stabilize the inactive conformation of MtrA, potentially reducing the rate of phosphorylation of the N-terminal domain. This combination of effects may form a switch, regulating the activity of MtrA. The domain orientation exhibited by MtrA also provides a rationale for the variation in linker length that is observed within the OmpR/PhoB family of response regulators.

---

Organizational Affiliation: 

Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA-binding response regulator mtrA	A	238	Mycobacterium tuberculosis	Mutation(s): 0  Gene Names: MT3344, MTCY20B11.21c, mtrA, Rv3246c
Find proteins for P9WGM7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WGM7  Go to UniProtKB:  P9WGM7

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	C [auth A], D [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.244 
• R-Value Work: 0.204 
• R-Value Observed: 0.204 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 38.916	α = 90
b = 56.598	β = 90
c = 135.069	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHENIX	refinement
PDB_EXTRACT	data extraction
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-05-05 
• Released Date: 2006-05-23 
Deposition Author(s): Friedland, N., Mack, T.R., Yu, M., Bursey, E.H., Hung, L.W., Stock, A.M., Waldo, G.S., Terwilliger, T.C.

Revision History  

• Version 1.0: 2006-05-23
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2017-10-18
  Changes: Advisory, Refinement description