4XT7

Crystal structure of Rv2671 from Mycobacterium tuberculosis in complex with NADP+ and trimethoprim


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structural Insights into Mycobacterium tuberculosis Rv2671 Protein as a Dihydrofolate Reductase Functional Analogue Contributing to para-Aminosalicylic Acid Resistance.

Cheng, Y.S.Sacchettini, J.C.

(2016) Biochemistry 55: 1107-1119

  • DOI: https://doi.org/10.1021/acs.biochem.5b00993
  • Primary Citation of Related Structures:  
    4XRB, 4XT4, 4XT5, 4XT6, 4XT7, 4XT8

  • PubMed Abstract: 

    Mycobacterium tuberculosis (Mtb) Rv2671 is annotated as a 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione 5'-phosphate (AROPP) reductase (RibD) in the riboflavin biosynthetic pathway. Recently, a strain of Mtb with a mutation in the 5' untranslated region of Rv2671, which resulted in its overexpression, was found to be resistant to dihydrofolate reductase (DHFR) inhibitors including the anti-Mtb drug para-aminosalicylic acid (PAS). In this study, a biochemical analysis of Rv2671 showed that it was able to catalyze the reduction of dihydrofolate (DHF) to tetrahydrofolate (THF), which explained why the overexpression of Rv2671 was sufficient to confer PAS resistance. We solved the structure of Rv2671 in complex with the NADP(+) and tetrahydrofolate (THF), which revealed the structural basis for the DHFR activity. The structures of Rv2671 complexed with two DHFR inhibitors, trimethoprim and trimetrexate, provided additional details of the substrate binding pocket and elucidated the differences between their inhibitory activities. Finally, Rv2671 was unable to catalyze the reduction of AROPP, which indicated that Rv2671 and its closely related orthologues are not involved in riboflavin biosynthesis.


  • Organizational Affiliation

    Department of Chemistry, Texas A&M University , College Station, Texas 77842, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Rv2671258Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: ribDRv2671RVBD_2671LH57_14640P425_02787
UniProt
Find proteins for P71968 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P71968 
Go to UniProtKB:  P71968
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP71968
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.017α = 90
b = 93.128β = 90
c = 74.572γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
SBC-Collectdata collection
HKL-3000data scaling
MOLREPphasing
HKL-3000data reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesU19AI107774
R.J. Wolfe-Welch FoundationUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-24
    Type: Initial release
  • Version 1.1: 2016-03-09
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description