Crystal structure of Mycobacterium tuberculosis H37Rv orotate phosphoribosyltransferase in complex with 5-phospho-alpha-D-ribosyl 1-diphosphate (PRPP)

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

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Structural investigations on orotate phosphoribosyltransferase from Mycobacterium tuberculosis, a key enzyme of the de novo pyrimidine biosynthesis.

Donini, S.Ferraris, D.M.Miggiano, R.Massarotti, A.Rizzi, M.

(2017) Sci Rep 7: 1180-1180

  • DOI: https://doi.org/10.1038/s41598-017-01057-z
  • Primary Citation of Related Structures:  
    5HKF, 5HKI, 5HKL

  • PubMed Abstract: 

    The Mycobacterium tuberculosis orotate phosphoribosyltransferase (MtOPRT) catalyses the conversion of α-D-5-phosphoribosyl-1-pyrophosphate (PRPP) and orotate (OA) in pyrophosphate and orotidine 5'-monophosphate (OMP), in presence of Mg 2+ . This enzyme is the only responsible for the synthesis of orotidine 5'-monophosphate, a key precursor in the de novo pyrimidine biosynthesis pathway, making MtOPRT an attractive drug target for the development of antitubercular agents. We report the crystal structures of MtOPRT in complex with PRPP (2.25 Å resolution), inorganic phosphate (1.90 Å resolution) and the exogenous compound Fe(III) dicitrate (2.40 Å resolution). The overall structure of the mycobacterial enzyme is highly similar to those described for other OPRTases, with the "flexible loop" assuming a well define conformation and making specific contacts with the Fe(III)-dicitrate complex. The structures here reported add to the knowledge of a potential drug target for tuberculosis, and will provide a useful tool for the structure-based drug design of potent enzyme inhibitors.

  • Organizational Affiliation

    Department of Pharmaceutical Sciences, Università del Piemonte Orientale "A. Avogadro", Largo Donegani 2, 28100, Novara, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Orotate phosphoribosyltransferase
A, B
189Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: pyrEumpARv0382cMTV036.17c
Find proteins for P9WHK9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WHK9 
Go to UniProtKB:  P9WHK9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WHK9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PRP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C5 H13 O14 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.201α = 90
b = 58.629β = 116.86
c = 57.224γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
ARPmodel building

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2017-01-25
    Type: Initial release
  • Version 1.1: 2017-12-06
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary