4WNB

Crystal structure of the ChsH1-ChsH2 complex from Mycobacterium tuberculosis bound to 3-OPC-CoA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 

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Literature

A Distinct MaoC-like Enoyl-CoA Hydratase Architecture Mediates Cholesterol Catabolism in Mycobacterium tuberculosis.

Yang, M., Guja, K.E., Thomas, S.T., Garcia-Diaz, M., Sampson, N.S.

(2014) ACS Chem Biol 9: 2632-2645

  • DOI: 10.1021/cb500232h
  • Primary Citation of Related Structures:  
    4W78, 4WNB

  • PubMed Abstract: 

    • The Mycobacterium tuberculosis (Mtb) igr operon plays an essential role in Mtb cholesterol metabolism, which is critical for pathogenesis during the latent stage of Mtb infection. Here we report the first structure of a heterotetrameric MaoC-like enoyl-CoA hydratase, ChsH1-ChsH2, which is encoded by two adjacent genes from the igr operon ...

    The Mycobacterium tuberculosis (Mtb) igr operon plays an essential role in Mtb cholesterol metabolism, which is critical for pathogenesis during the latent stage of Mtb infection. Here we report the first structure of a heterotetrameric MaoC-like enoyl-CoA hydratase, ChsH1-ChsH2, which is encoded by two adjacent genes from the igr operon. We demonstrate that ChsH1-ChsH2 catalyzes the hydration of a steroid enoyl-CoA, 3-oxo-4,17-pregnadiene-20-carboxyl-CoA, in the modified β-oxidation pathway for cholesterol side chain degradation. The ligand-bound and apoenzyme structures of ChsH1-ChsH2(N) reveal an unusual, modified hot-dog fold with a severely truncated central α-helix that creates an expanded binding site to accommodate the bulkier steroid ring system. The structures show quaternary structure shifts that accommodate the four rings of the steroid substrate and offer an explanation for why the unusual heterotetrameric assembly is utilized for hydration of this steroid. The unique αβ heterodimer architecture utilized by ChsH1-ChsH2 to bind its distinctive substrate highlights an opportunity for the development of new antimycobacterial drugs that target a pathway specific to Mtb.

    Organizational Affiliation: 

    Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Hydratase ChsH2A187Mycobacterium tuberculosis KZN 4207Mutation(s): 0 
Gene Names: TBSG_03608, V459_03372
Entity Groups  
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Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Hydratase ChsH1B129Mycobacterium tuberculosis CMutation(s): 0 
Gene Names: TBCG_03470
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
4BN
Query on 4BN
Download Ideal Coordinates CCD File 
E [auth A]3-oxo-4-pregnene-20-carboxyl-Coenzyme A
C43 H66 N7 O18 P3 S
CJJBDUCNUMWUJX-ZKTJOKCMSA-N		 Ligand Interaction
CD
Query on CD
Download Ideal Coordinates CCD File 
C [auth A],
F [auth B]		CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
D [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.882α = 90
b = 51.882β = 90
c = 436.235γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01-GM100021

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-29
    Type: Initial release
  • Version 1.1: 2014-11-26
    Changes: Database references
  • Version 1.2: 2014-12-03
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Derived calculations, Other, Refinement description, Source and taxonomy
  • Version 1.4: 2019-12-25
    Changes: Author supporting evidence