6CCE

Crystal structure of a Mycobacterium smegmatis RNA polymerase transcription initiation complex with inhibitor Kanglemycin A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Rifamycin congeners kanglemycins are active against rifampicin-resistant bacteria via a distinct mechanism.

Peek, J.Lilic, M.Montiel, D.Milshteyn, A.Woodworth, I.Biggins, J.B.Ternei, M.A.Calle, P.Y.Danziger, M.Warrier, T.Saito, K.Braffman, N.Fay, A.Glickman, M.S.Darst, S.A.Campbell, E.A.Brady, S.F.

(2018) Nat Commun 9: 4147-4147

  • DOI: https://doi.org/10.1038/s41467-018-06587-2
  • Primary Citation of Related Structures:  
    6CCE, 6CCV, 6DCF

  • PubMed Abstract: 

    Rifamycin antibiotics (Rifs) target bacterial RNA polymerases (RNAPs) and are widely used to treat infections including tuberculosis. The utility of these compounds is threatened by the increasing incidence of resistance (Rif R ). As resistance mechanisms found in clinical settings may also occur in natural environments, here we postulated that bacteria could have evolved to produce rifamycin congeners active against clinically relevant resistance phenotypes. We survey soil metagenomes and identify a tailoring enzyme-rich family of gene clusters encoding biosynthesis of rifamycin congeners (kanglemycins, Kangs) with potent in vivo and in vitro activity against the most common clinically relevant Rif R mutations. Our structural and mechanistic analyses reveal the basis for Kang inhibition of Rif R RNAP. Unlike Rifs, Kangs function through a mechanism that includes interfering with 5'-initiating substrate binding. Our results suggest that examining soil microbiomes for new analogues of clinically used antibiotics may uncover metabolites capable of circumventing clinically important resistance mechanisms.


  • Organizational Affiliation

    Laboratory of Genetically Encoded Small Molecules, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RNA polymerase-binding protein RbpAA [auth J]114Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: rbpAMSMEG_3858MSMEI_3768
UniProt
Find proteins for A0QZ11 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
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UniProt GroupA0QZ11
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alphaB [auth A],
C [auth B]
350Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for A0QSL8 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
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UniProt GroupA0QSL8
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit betaD [auth C]1,169Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for P60281 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
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UniProt GroupP60281
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta'E [auth D]1,317Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for A0QS66 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
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UniProt GroupA0QS66
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit omegaF [auth E]107Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for A0QWT1 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
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UniProt GroupA0QWT1
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
RNA polymerase sigma factor SigAG [auth F]466Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: sigAMSMEG_2758
UniProt
Find proteins for A0QW02 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
poly(UNK)I [auth G]19Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
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Entity ID: 7
MoleculeChains LengthOrganismImage
DNA (57-MER)H [auth O]57synthetic construct
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
KNG
Query on KNG

Download Ideal Coordinates CCD File 
J [auth C]Kanglemycin A
C50 H67 N O19
RKRZBNCHQZDJPK-UAXKWEMASA-N
GLU
Query on GLU

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O [auth D]GLUTAMIC ACID
C5 H9 N O4
WHUUTDBJXJRKMK-VKHMYHEASA-N
SO4
Query on SO4

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K [auth C]
L [auth C]
P [auth D]
Q [auth D]
R [auth D]
K [auth C],
L [auth C],
P [auth D],
Q [auth D],
R [auth D],
S [auth D],
T [auth F],
U [auth F]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
ZN
Query on ZN

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M [auth D]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
EDO
Query on EDO

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V [auth F],
W [auth F],
X [auth F]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
N [auth D]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.564α = 90
b = 161.583β = 110.73
c = 135.141γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-15
    Type: Initial release
  • Version 1.1: 2018-11-07
    Changes: Data collection, Source and taxonomy
  • Version 1.2: 2019-02-27
    Changes: Data collection, Database references
  • Version 1.3: 2019-04-24
    Changes: Author supporting evidence, Data collection
  • Version 1.4: 2023-10-04
    Changes: Data collection, Database references, Refinement description