7ZKZ

Crystal structure of cystinosin from Arabidopsis thaliana bound to two nanobodies


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.236 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

Structural basis for proton coupled cystine transport by cystinosin.

Lobel, M.Salphati, S.P.El Omari, K.Wagner, A.Tucker, S.J.Parker, J.L.Newstead, S.

(2022) Nat Commun 13: 4845-4845

  • DOI: https://doi.org/10.1038/s41467-022-32589-2
  • Primary Citation of Related Structures:  
    7ZK1, 7ZKW, 7ZKZ

  • PubMed Abstract: 

    Amino acid transporters play a key role controlling the flow of nutrients across the lysosomal membrane and regulating metabolism in the cell. Mutations in the gene encoding the transporter cystinosin result in cystinosis, an autosomal recessive metabolic disorder characterised by the accumulation of cystine crystals in the lysosome. Cystinosin is a member of the PQ-loop family of solute carrier (SLC) transporters and uses the proton gradient to drive cystine export into the cytoplasm. However, the molecular basis for cystinosin function remains elusive, hampering efforts to develop novel treatments for cystinosis and understand the mechanisms of ion driven transport in the PQ-loop family. To address these questions, we present the crystal structures of cystinosin from Arabidopsis thaliana in both apo and cystine bound states. Using a combination of in vitro and in vivo based assays, we establish a mechanism for cystine recognition and proton coupled transport. Mutational mapping and functional characterisation of human cystinosin further provide a framework for understanding the molecular impact of disease-causing mutations.


  • Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford, UK.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cystinosin homolog277Arabidopsis thalianaMutation(s): 0 
Gene Names: At5g40670MNF13.23
Membrane Entity: Yes 
UniProt
Find proteins for P57758 (Arabidopsis thaliana)
Explore P57758 
Go to UniProtKB:  P57758
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP57758
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Llama nanobody128Lama glamaMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
nanobody123Lama glamaMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.33 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.236 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 210.281α = 90
b = 77.457β = 93.25
c = 46.303γ = 90
Software Package:
Software NamePurpose
xia2data scaling
BUSTERrefinement
PDB_EXTRACTdata extraction
DIALSdata reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom215519/Z/19/Z

Revision History  (Full details and data files)

  • Version 1.0: 2022-08-31
    Type: Initial release
  • Version 1.1: 2024-01-31
    Changes: Data collection, Refinement description