Biological Assembly 1  

 3D View: Structure | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 24.60 kDa 
• Atom Count: 1715 
• Modelled Residue Count: 188 
• Deposited Residue Count: 205 
• Unique protein chains: 1

1SD5

Crystal structure of Rv1626

• DOI: 10.2210/pdb1SD5/pdb

• Classification: STRUCTURAL GENOMICS, UNKNOWN FUNCTION
• Organism(s): Mycobacterium tuberculosis H37Rv
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-02-13 Released: 2004-09-21 
• Deposition Author(s): Morth, J.P., Feng, V., Perry, L.J., Svergun, D.I., Tucker, P.A., TB Structural Genomics Consortium (TBSGC)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.68 Å
• R-Value Free: 0.216 
• R-Value Work: 0.171 
• R-Value Observed: 0.173 

Literature

The Crystal and Solution Structure of a Putative Transcriptional Antiterminator from Mycobacterium tuberculosis.

Morth, J.P., Feng, V., Perry, L.J., Svergun, D.I., Tucker, P.A.

(2004) Structure 12: 1595-1605

• PubMed: 15341725 
• DOI: 10.1016/j.str.2004.06.018
• Primary Citation of Related Structures:  
  1S8N, 1SD5


• PubMed Abstract: 
  

We describe the crystal structure of Rv1626 from Mycobacterium tuberculosis at 1.48 A resolution and the corresponding solution structure determined from small angle X-ray scattering. The N-terminal domain shows structural homology to the receiver domains found in bacterial two-component systems. The C-terminal domain has high structural homology to a recently discovered RNA binding domain involved in transcriptional antitermination. The molecule in solution was found to be monomeric as it is in the crystal, but in solution it undergoes a conformational change that is triggered by changes in ionic strength. This is the first structure that links the phosphorylation cascade of the two-component systems with the antitermination event in the transcriptional machinery. Rv1626 belongs to a family of proteins, which we propose calling phosphorylation-dependent transcriptional antitermination regulators, so far only found in bacteria, and includes NasT, a protein from the assimilatory nitrate/nitrite reductase operon of Azetobacter vinelandii.

---

Organizational Affiliation: 

EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
putative antiterminator	A	205	Mycobacterium tuberculosis H37Rv	Mutation(s): 0  Gene Names: Rv1626, pdtaR
UniProt
Find proteins for P9WGM3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WGM3  Go to UniProtKB:  P9WGM3

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IOD	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth A], O [auth A], P [auth A]	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.68 Å
• R-Value Free: 0.216 
• R-Value Work: 0.171 
• R-Value Observed: 0.173 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 44.558	α = 90
b = 44.558	β = 90
c = 180.965	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-02-13 
• Released Date: 2004-09-21 
Deposition Author(s): Morth, J.P., Feng, V., Perry, L.J., Svergun, D.I., Tucker, P.A., TB Structural Genomics Consortium (TBSGC)

Revision History  

• Version 1.0: 2004-09-21
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Source and taxonomy, Version format compliance