1A54

PHOSPHATE-BINDING PROTEIN MUTANT A197C LABELLED WITH A COUMARIN FLUOROPHORE AND BOUND TO DIHYDROGENPHOSPHATE ION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.177 

Starting Model: experimental
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This is version 2.1 of the entry. See complete history


Literature

Crystal structure of phosphate binding protein labeled with a coumarin fluorophore, a probe for inorganic phosphate.

Hirshberg, M.Henrick, K.Haire, L.L.Vasisht, N.Brune, M.Corrie, J.E.Webb, M.R.

(1998) Biochemistry 37: 10381-10385

  • DOI: https://doi.org/10.1021/bi980428z
  • Primary Citation of Related Structures:  
    1A54, 1A55

  • PubMed Abstract: 

    Crystal structures are presented for the A197C mutant of Escherichia coli phosphate binding protein (PBP) and the same mutant labeled at Cys197 with N-[2-(1-maleimidyl)ethyl]-7-(diethylamino)coumarin-3-carboxamide (MDCC). Both proteins are complexed with inorganic phosphate. The latter molecule, MDCC-PBP, exhibits a large increase in fluorescence on binding inorganic phosphate. The resulting high-fluorescence state of the coumarin and the ability of this coumarin to monitor the conformational changes associated with inorganic phosphate binding are interpreted in terms of the specific interactions of MDCC with the protein. The structure helps to explain why this particular label gives a high-fluorescence state on binding inorganic phosphate, while several other related labels do not, and hence aids our general understanding of environmentally sensitive fluorescence probes on proteins.


  • Organizational Affiliation

    Division of Protein Structure, National Institute for Medical Research, Mill Hill, London, U.K. m-hirshb@anika.nimr.mrc.ac.uk


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphate-binding protein PstS321Escherichia coliMutation(s): 1 
Gene Names: pstSBvCmsKKP036_01783EYX47_15990
UniProt
Find proteins for P0AG82 (Escherichia coli (strain K12))
Explore P0AG82 
Go to UniProtKB:  P0AG82
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AG82
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MDC
Query on MDC

Download Ideal Coordinates CCD File 
C [auth A]N-[2-(1-MALEIMIDYL)ETHYL]-7-DIETHYLAMINOCOUMARIN-3-CARBOXAMIDE
C20 H21 N3 O5
OJBZDUMTXGGVSP-KTKRTIGZSA-N
2HP
Query on 2HP

Download Ideal Coordinates CCD File 
B [auth A]DIHYDROGENPHOSPHATE ION
H2 O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.177 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.498α = 90
b = 62.651β = 90
c = 122.608γ = 90
Software Package:
Software NamePurpose
CCP4model building
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
CCP4phasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-10-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Advisory, Database references, Derived calculations, Other
  • Version 2.0: 2022-08-10
    Changes: Atomic model, Data collection, Database references, Derived calculations, Source and taxonomy, Structure summary
  • Version 2.1: 2023-08-02
    Changes: Refinement description