4Z0M

EchA5 Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Unsaturated Lipid Assimilation by Mycobacteria Requires Auxiliary cis-trans Enoyl CoA Isomerase

Srivastava, S.Chaudhary, S.Thukral, L.Shi, C.Gupta, R.D.Gupta, R.Priyadarshan, K.Vats, A.Haque, A.S.Sankaranarayanan, R.Natarajan, V.T.Sharma, R.Aldrich, C.C.Gokhale, R.S.

(2015) Chem Biol 22: 1577-1587

  • DOI: https://doi.org/10.1016/j.chembiol.2015.10.009
  • Primary Citation of Related Structures:  
    4Z0M, 5E0N

  • PubMed Abstract: 

    Mycobacterium tuberculosis (Mtb) can survive in hypoxic necrotic tissue by assimilating energy from host-derived fatty acids. While the expanded repertoire of β-oxidation auxiliary enzymes is considered crucial for Mtb adaptability, delineating their functional relevance has been challenging. Here, we show that the Mtb fatty acid degradation (FadAB) complex cannot selectively break down cis fatty acyl substrates. We demonstrate that the stereoselective binding of fatty acyl substrates in the Mtb FadB pocket is due to the steric hindrance from Phe287 residue. By developing a functional screen, we classify the family of Mtb Ech proteins as monofunctional or bifunctional enzymes, three of which complement the FadAB complex to degrade cis fatty acids. Crystal structure determination of two cis-trans enoyl coenzyme A (CoA) isomerases reveals distinct placement of active-site residue in Ech enzymes. Our studies thus reveal versatility of Mtb lipid-remodeling enzymes and identify an essential role of stand-alone cis-trans enoyl CoA isomerases in mycobacterial biology.


  • Organizational Affiliation

    CSIR-Institute of Genomics and Integrative Biology, Mathura Road, New Delhi 110020, India; Academy of Scientific and Innovative Research, Rafi Marg, New Delhi 110001, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Enoyl-CoA hydratase
A, B, C
269Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: echA5Rv0675
EC: 4.2.1.17
UniProt
Find proteins for I6Y4E8 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore I6Y4E8 
Go to UniProtKB:  I6Y4E8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupI6Y4E8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.708α = 90
b = 136.708β = 90
c = 125.802γ = 120
Software Package:
Software NamePurpose
MOSFLMdata processing
SCALAdata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of Science and TechnologyIndiaSB/S2/RJN-14/2013
CSIR Network ProjectsIndiaGenCODE BSC0123

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-03
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Database references, Derived calculations
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Refinement description