4ICT

Substrate and reaction specificity of Mycobacterium tuberculosis cytochrome P450 CYP121


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Substrate and Reaction Specificity of Mycobacterium tuberculosis Cytochrome P450 CYP121: INSIGHTS FROM BIOCHEMICAL STUDIES AND CRYSTAL STRUCTURES.

Fonvielle, M.Le Du, M.H.Lequin, O.Lecoq, A.Jacquet, M.Thai, R.Dubois, S.Grach, G.Gondry, M.Belin, P.

(2013) J.Biol.Chem. 288: 17347-17359

  • DOI: 10.1074/jbc.M112.443853
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cytochrome P450 CYP121 is essential for the viability of Mycobacterium tuberculosis. Studies in vitro show that it can use the cyclodipeptide cyclo(l-Tyr-l-Tyr) (cYY) as a substrate. We report an investigation of the substrate and reaction specificit ...

    Cytochrome P450 CYP121 is essential for the viability of Mycobacterium tuberculosis. Studies in vitro show that it can use the cyclodipeptide cyclo(l-Tyr-l-Tyr) (cYY) as a substrate. We report an investigation of the substrate and reaction specificities of CYP121 involving analysis of the interaction between CYP121 and 14 cYY analogues with various modifications of the side chains or the diketopiperazine (DKP) ring. Spectral titration experiments show that CYP121 significantly bound only cyclodipeptides with a conserved DKP ring carrying two aryl side chains in l-configuration. CYP121 did not efficiently or selectively transform any of the cYY analogues tested, indicating a high specificity for cYY. The molecular determinants of this specificity were inferred from both crystal structures of CYP121-analog complexes solved at high resolution and solution NMR spectroscopy of the analogues. Bound cYY or its analogues all displayed a similar set of contacts with CYP121 residues Asn(85), Phe(168), and Trp(182). The propensity of the cYY tyrosyl to point toward Arg(386) was dependent on the presence of the DKP ring that limits the conformational freedom of the ligand. The correct positioning of the hydroxyl of this tyrosyl was essential for conversion of cYY. Thus, the specificity of CYP121 results from both a restricted binding specificity and a fine-tuned P450 substrate relationship. These results document the catalytic mechanism of CYP121 and improve our understanding of its function in vivo. This work contributes to progress toward the design of inhibitors of this essential protein of M. tuberculosis that could be used for antituberculosis therapy.


    Organizational Affiliation

    Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), iBiTec-S, Service d'Ingénierie Moléculaire des Protéines, 91191 Gif-sur-Yvette Cedex, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytochrome P450 121
A
394Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: cyp121
EC: 1.14.19.70
Find proteins for P9WPP7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WPP7
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
1ED
Query on 1ED

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Download CCD File 
A
(3S,6S)-3-benzyl-6-(4-hydroxybenzyl)piperazine-2,5-dione
C18 H18 N2 O3
GRWVBLRIPRGGPD-HOTGVXAUSA-N
 Ligand Interaction
HEM
Query on HEM

Download SDF File 
Download CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
1EDKd: 45600 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.178 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 77.808α = 90.00
b = 77.808β = 90.00
c = 264.085γ = 120.00
Software Package:
Software NamePurpose
FFTphasing
SCALAdata scaling
ADSCdata collection
FFTmodel building
MOSFLMdata reduction
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-01
    Type: Initial release
  • Version 1.1: 2013-05-08
    Type: Database references
  • Version 1.2: 2013-07-03
    Type: Database references