1PC3

Crystal structure of the extracellular phosphate ABC transport receptor (PstS-1) and immunodominant antigen of M. tuberculosis.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of M tuberculosis ABC phosphate transport receptor: specificity and charge compensation dominated by ion-dipole interactions.

Vyas, N.K.Vyas, M.N.Quiocho, F.A.

(2003) Structure 11: 765-774

  • DOI: 10.1016/s0969-2126(03)00109-6
  • Primary Citation of Related Structures:  
    1PC3

  • PubMed Abstract: 
  • The 2.16 A structure of the phosphate-bound PstS-1, the primary extracellular receptor for the ABC phosphate transporter and immunodominant species-specific antigen of Mycobacterium tuberculosis, has been determined. The phosphate, completely engulfe ...

    The 2.16 A structure of the phosphate-bound PstS-1, the primary extracellular receptor for the ABC phosphate transporter and immunodominant species-specific antigen of Mycobacterium tuberculosis, has been determined. The phosphate, completely engulfed in the cleft between two domains, is bound by 13 hydrogen bonds, 11 of which are formed with NH and OH dipolar donor groups. The further presence of two acidic residues, which serve as acceptors of the protonated phosphate, is key to conferring stringent specificity. The ion-dipole interactions between the phosphate and dipolar groups compensate the ligand's isolated negative charges. Moreover, the surprise finding that the electrostatic surface in and around the cleft is intensely negative demonstrates the power of ion-dipole interactions in anion binding and electrostatic balance. Additional functional features include both the flexible N-terminal segment that tethers PstS-1 on the cell surface and the hinge between the two domains, which should facilitate snaring the phosphate in the medium.


    Organizational Affiliation

    Verna and Marrs McLean Department, Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphate-binding protein 1AB350Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: PSTS1 OR PHOS1 OR RV0934 OR MT0961 OR MTCY08D9.05CpstS1phoS1Rv0934MTCY08D9.05c
Find proteins for P9WGU1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WGU1 
Go to UniProtKB:  P9WGU1
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download CCD File 
A, B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.4α = 90
b = 72.3β = 90
c = 73.4γ = 90
Software Package:
Software NamePurpose
CNSrefinement
STRATEGYdata reduction
SDMSdata scaling
PHASESphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-05-18
    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