Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 42.93 kDa 
• Atom Count: 2988 
• Modelled Residue Count: 390 
• Deposited Residue Count: 406 
• Unique protein chains: 1

3MH8

Crystal structure of LprG from Mycobacterium tuberculosis

• DOI: 10.2210/pdb3MH8/pdb

• Classification: LIPID BINDING PROTEIN
• Organism(s): Mycobacterium tuberculosis H37Rv
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-04-07 Released: 2010-09-01 
• Deposition Author(s): Tsai, H.-C., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.278 
• R-Value Work: 0.229 
• R-Value Observed: 0.232 

Literature

Mycobacterium tuberculosis lipoprotein LprG (Rv1411c) binds triacylated glycolipid agonists of Toll-like receptor 2.

Drage, M.G., Tsai, H.C., Pecora, N.D., Cheng, T.Y., Arida, A.R., Shukla, S., Rojas, R.E., Seshadri, C., Moody, D.B., Boom, W.H., Sacchettini, J.C., Harding, C.V.

(2010) Nat Struct Mol Biol 17: 1088-1095

• PubMed: 20694006 
• DOI: 10.1038/nsmb.1869
• Primary Citation of Related Structures:  
  3MHA, 3MH8, 3MH9


• PubMed Abstract: 
  

Knockout of lprG results in decreased virulence of Mycobacterium tuberculosis (MTB) in mice. MTB lipoprotein LprG has TLR2 agonist activity, which is thought to be dependent on its N-terminal triacylation. Unexpectedly, here we find that nonacylated LprG retains TLR2 activity. Moreover, we show LprG association with triacylated glycolipid TLR2 agonists lipoarabinomannan, lipomannan and phosphatidylinositol mannosides (which share core structures). Binding of triacylated species was specific to LprG (not LprA) and increased LprG TLR2 agonist activity; conversely, association of glycolipids with LprG enhanced their recognition by TLR2. The crystal structure of LprG in complex with phosphatidylinositol mannoside revealed a hydrophobic pocket that accommodates the three alkyl chains of the ligand. In conclusion, we demonstrate a glycolipid binding function of LprG that enhances recognition of triacylated MTB glycolipids by TLR2 and may affect glycolipid assembly or transport for bacterial cell wall biogenesis.

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Organizational Affiliation: 

Department of Pathology, Case Western Reserve University/University Hospitals Case Medical Center, Cleveland, Ohio, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Lipoprotein lprG	A, B	203	Mycobacterium tuberculosis H37Rv	Mutation(s): 0  Gene Names: lpp-27, lprG, MT1455, MTCY21B4.28c, Rv1411c
UniProt
Find proteins for P9WK45 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WK45  Go to UniProtKB:  P9WK45

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.278 
• R-Value Work: 0.229 
• R-Value Observed: 0.232 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 95.296	α = 90
b = 71.887	β = 106.32
c = 61.266	γ = 90

Software Package:

Software Name	Purpose
CrystalClear	data collection
SHARP	phasing
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-04-07 
• Released Date: 2010-09-01 
Deposition Author(s): Tsai, H.-C., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

Revision History  

• Version 1.0: 2010-09-01
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance