6TI2

Structure of the Ustilago maydis chorismate mutase 1 in complex with KWL1-b from Zea mays


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

The two paralogous kiwellin proteins KWL1 and KWL1-b from maize are structurally related and have overlapping functions in plant defense.

Altegoer, F.Weiland, P.Giammarinaro, P.I.Freibert, S.A.Binnebesel, L.Han, X.Lepak, A.Kahmann, R.Lechner, M.Bange, G.

(2020) J Biol Chem 295: 7816-7825

  • DOI: https://doi.org/10.1074/jbc.RA119.012207
  • Primary Citation of Related Structures:  
    6TI2

  • PubMed Abstract: 

    Many plant-pathogenic bacteria and fungi deploy effector proteins that down-regulate plant defense responses and reprogram plant metabolism for colonization and survival in planta Kiwellin (KWL) proteins are a widespread family of plant-defense proteins that target these microbial effectors. The KWL1 protein from maize (corn, Zea mays ) specifically inhibits the enzymatic activity of the secreted chorismate mutase Cmu1, a virulence-promoting effector of the smut fungus Ustilago maydis. In addition to KWL1, 19 additional KWL paralogs have been identified in maize. Here, we investigated the structure and mechanism of the closest KWL1 homolog, KWL1-b (ZEAMA_GRMZM2G305329). We solved the Cmu1-KWL1-b complex to 2.75 Å resolution, revealing a highly symmetric Cmu1-KWL1-b heterotetramer in which each KWL1-b monomer interacts with a monomer of the Cmu1 homodimer. The structure also revealed that the overall architecture of the heterotetramer is highly similar to that of the previously reported Cmu1-KWL1 complex. We found that upon U. maydis infection of Z. mays , KWL1-b is expressed at significantly lower levels than KWL1 and exhibits differential tissue-specific expression patterns. We also show that KWL1-b inhibits Cmu1 activity similarly to KWL1. We conclude that KWL1 and KWL1-b are part of a redundant defense system that tissue-specifically targets Cmu1. This notion was supported by the observation that both KWL proteins are carbohydrate-binding proteins with distinct and likely tissue-related specificities. Moreover, binding by Cmu1 modulated the carbohydrate-binding properties of both KWLs. These findings indicate that KWL proteins are part of a spatiotemporally coordinated, plant-wide defense response comprising proteins with overlapping activities.


  • Organizational Affiliation

    SYNMIKRO Research Center and Department of Chemistry, Philipps-University Marburg, Marburg, Germany florian.altegoer@synmikro.uni-marburg.de gert.bange@synmikro.uni-marburg.de.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chromosome 16, whole genome shotgun sequenceA [auth B],
B [auth C]
278Mycosarcoma maydisMutation(s): 0 
Gene Names: UMAG_05731
EC: 5.4.99.5
UniProt
Find proteins for A0A0D1DWQ2 (Ustilago maydis (strain 521 / FGSC 9021))
Explore A0A0D1DWQ2 
Go to UniProtKB:  A0A0D1DWQ2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0D1DWQ2
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ripening-related protein 3C [auth E],
D [auth A]
199Zea maysMutation(s): 0 
Gene Names: 103642133ZEAMMB73_Zm00001d026470
UniProt
Find proteins for K7U7F7 (Zea mays)
Explore K7U7F7 
Go to UniProtKB:  K7U7F7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupK7U7F7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.226 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.74α = 90
b = 124.58β = 96.216
c = 98.21γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Cootmodel building
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-06
    Type: Initial release
  • Version 1.1: 2020-05-13
    Changes: Database references
  • Version 1.2: 2020-06-17
    Changes: Database references
  • Version 1.3: 2024-01-24
    Changes: Data collection, Database references, Refinement description
  • Version 1.4: 2024-10-23
    Changes: Structure summary