3OT9

Phosphopentomutase from Bacillus cereus bound to glucose-1,6-bisphosphate

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.164 

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This is version 1.2 of the entry. See complete history. 


Literature

Bacillus cereus Phosphopentomutase Is an Alkaline Phosphatase Family Member That Exhibits an Altered Entry Point into the Catalytic Cycle.

Panosian, T.D., Nannemann, D.P., Watkins, G.R., Phelan, V.V., McDonald, W.H., Wadzinski, B.E., Bachmann, B.O., Iverson, T.M.

(2011) J Biol Chem 286: 8043-8054

  • DOI: 10.1074/jbc.M110.201350
  • Primary Citation of Related Structures:  
    3M8W, 3M8Y, 3M8Z, 3OT9

  • PubMed Abstract: 

    • Bacterial phosphopentomutases (PPMs) are alkaline phosphatase superfamily members that interconvert α-D-ribose 5-phosphate (ribose 5-phosphate) and α-D-ribose 1-phosphate (ribose 1-phosphate). We investigated the reaction mechanism of Bacillus cereus PPM using a combination of structural and biochemical studies ...

    Bacterial phosphopentomutases (PPMs) are alkaline phosphatase superfamily members that interconvert α-D-ribose 5-phosphate (ribose 5-phosphate) and α-D-ribose 1-phosphate (ribose 1-phosphate). We investigated the reaction mechanism of Bacillus cereus PPM using a combination of structural and biochemical studies. Four high resolution crystal structures of B. cereus PPM revealed the active site architecture, identified binding sites for the substrate ribose 5-phosphate and the activator α-D-glucose 1,6-bisphosphate (glucose 1,6-bisphosphate), and demonstrated that glucose 1,6-bisphosphate increased phosphorylation of the active site residue Thr-85. The phosphorylation of Thr-85 was confirmed by Western and mass spectroscopic analyses. Biochemical assays identified Mn(2+)-dependent enzyme turnover and demonstrated that glucose 1,6-bisphosphate treatment increases enzyme activity. These results suggest that protein phosphorylation activates the enzyme, which supports an intermolecular transferase mechanism. We confirmed intermolecular phosphoryl transfer using an isotope relay assay in which PPM reactions containing mixtures of ribose 5-[(18)O(3)]phosphate and [U-(13)C(5)]ribose 5-phosphate were analyzed by mass spectrometry. This intermolecular phosphoryl transfer is seemingly counter to what is anticipated from phosphomutases employing a general alkaline phosphatase reaction mechanism, which are reported to catalyze intramolecular phosphoryl transfer. However, the two mechanisms may be reconciled if substrate encounters the enzyme at a different point in the catalytic cycle.

    Organizational Affiliation: 

    Department of Pharmacology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PhosphopentomutaseA, B, C399Bacillus cereus ATCC 14579Mutation(s): 0 
Gene Names: BC_4087, deoB
EC: 5.4.2.7
Find proteins for Q818Z9 (Bacillus cereus (strain ATCC 14579 / DSM 31 / JCM 2152 / NBRC 15305 / NCIMB 9373 / NRRL B-3711))
Explore Q818Z9 
Go to UniProtKB:  Q818Z9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
G16
Query on G16
Download Ideal Coordinates CCD File 
 I [auth A]1,6-di-O-phosphono-alpha-D-glucopyranose
C6 H13 O12 P2
RWHOZGRAXYWRNX-VFUOTHLCSA-M		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
 G [auth A], H [auth A], M [auth B]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
MN
Query on MN
Download Ideal Coordinates CCD File 
D [auth A] , E [auth A] , F [auth A] , J [auth B] , K [auth B] , L [auth B] , N [auth C] , O [auth C] , 
D [auth A],  E [auth A],  F [auth A],  J [auth B],  K [auth B],  L [auth B],  N [auth C],  O [auth C],  P [auth C]
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO		A, B, CL-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.164 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.871α = 90
b = 76.582β = 108.73
c = 107.051γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Database references, Derived calculations, Structure summary