1LQT

A covalent modification of NADP+ revealed by the atomic resolution structure of FprA, a Mycobacterium tuberculosis oxidoreductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.05 Å
  • R-Value Free: 0.153 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.134 

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This is version 1.3 of the entry. See complete history


Literature

A covalent modification of NADP+ revealed by the atomic resolution structure of FprA, a Mycobacterium tuberculosis oxidoreductase.

Bossi, R.T.Aliverti, A.Raimondi, D.Fischer, F.Zanetti, G.Ferrari, D.Tahallah, N.Maier, C.S.Heck, A.J.R.Rizzi, M.Mattevi, A.

(2002) Biochemistry 41: 8807-8818

  • DOI: 10.1021/bi025858a
  • Primary Citation of Related Structures:  
    1LQU, 1LQT

  • PubMed Abstract: 
  • FprA is a mycobacterial oxidoreductase that catalyzes the transfer of reducing equivalents from NADPH to a protein acceptor. We determined the atomic resolution structure of FprA in the oxidized (1.05 A resolution) and NADPH-reduced (1.25 A resolution) forms ...

    FprA is a mycobacterial oxidoreductase that catalyzes the transfer of reducing equivalents from NADPH to a protein acceptor. We determined the atomic resolution structure of FprA in the oxidized (1.05 A resolution) and NADPH-reduced (1.25 A resolution) forms. The comparison of these FprA structures with that of bovine adrenodoxin reductase showed no significant overall differences. Hence, these enzymes, which belong to the structural family of the disulfide oxidoreductases, are structurally conserved in very distant organisms such as mycobacteria and mammals. Despite the conservation of the overall fold, the details of the active site of FprA show some peculiar features. In the oxidized enzyme complex, the bound NADP+ exhibits a covalent modification, which has been identified as an oxygen atom linked through a carbonylic bond to the reactive C4 atom of the nicotinamide ring. Mass spectrometry has confirmed this assignment. This NADP+ derivative is likely to form by oxidation of the NADP+ adduct resulting from nucleophilic attack by an active-site water molecule. A Glu-His pair is well positioned to activate the attacking water through a mechanism analogous to that of the catalytic triad in serine proteases. The NADP+ nicotinamide ring exhibits the unusual cis conformation, which may favor derivative formation. The physiological significance of this reaction is presently unknown. However, it could assist with drug-design studies in that the modified NADP+ could serve as a lead compound for the development of specific inhibitors.


    Organizational Affiliation

    Dipartimento di Genetica e Microbiologia, Università di Pavia, via Abbiategrasso 207, 27100 Pavia, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FprAA, B456Mycobacterium tuberculosisMutation(s): 0 
EC: 1.18.1.2
UniProt
Find proteins for P9WIQ3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WIQ3 
Go to UniProtKB:  P9WIQ3
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
H [auth A], P [auth B]FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
ODP
Query on ODP

Download Ideal Coordinates CCD File 
I [auth A], Q [auth B]4-OXO-NICOTINAMIDE-ADENINE DINUCLEOTIDE PHOSPHATE
C21 H29 N7 O18 P3
PIXSDSMVQQICPA-BYJCYCELSA-O
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
C [auth A] , D [auth A] , E [auth A] , F [auth A] , G [auth A] , J [auth B] , K [auth B] , L [auth B] , 
C [auth A],  D [auth A],  E [auth A],  F [auth A],  G [auth A],  J [auth B],  K [auth B],  L [auth B],  M [auth B],  N [auth B],  O [auth B]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.05 Å
  • R-Value Free: 0.153 
  • R-Value Work: 0.134 
  • R-Value Observed: 0.134 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.335α = 90
b = 89.215β = 90
c = 160.873γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
BEASTmodel building
REFMACrefinement
CCP4data scaling
BEASTphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-07-31
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description