5E0N

Crystal Structure of MSMEG_3139, a monofunctional enoyl CoA isomerase from M.smegmatis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.06 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 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/isomeraseA [auth X]293Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: MSMEG_3139
UniProt
Find proteins for A0QX16 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QX16 
Go to UniProtKB:  A0QX16
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0QX16
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.06 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.601α = 90
b = 102.601β = 90
c = 145.951γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
Cootmodel building
MOLREPphasing
DENZOdata processing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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