Crystal structure of a bacterial TPAT family transporter

Experimental Data Snapshot

  • Resolution: 1.03 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.165 

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Structures and Mechanisms of a Novel Bacterial Transport System for Fatty Acids.

Zhai, L.Chou, J.C.Oo, H.Dassama, L.M.K.

(2023) Chembiochem 24: e202300156-e202300156

  • DOI: https://doi.org/10.1002/cbic.202300156
  • Primary Citation of Related Structures:  
    8G52, 8G53

  • PubMed Abstract: 

    Bacterial acquisition of metabolites is largely facilitated by transporters with unique substrate scopes. The tripartite ATP-independent periplasmic (TRAP) transporters comprise a large family of bacterial proteins that facilitate the uptake of a variety of small molecules. It has been reported that some TRAP systems encode a fourth protein, the T component. The T-component, or TatT, is predicted to be a periplasmic-facing lipoprotein that enables the uptake of metabolites from the outer membrane. However, no substrates were revealed for any TatT and their functional role(s) remained enigmatic. We recently identified a homolog in Methylococcus capsulatus that binds to sterols, and herein, we report two additional homologs that demonstrate a preference for long-chain fatty acids. Our bioinformatics, quantitative analyses of protein-ligand interactions, and high-resolution crystal structures suggest that TatTs might facilitate the trafficking of hydrophobic or lipophilic substrates and represent a new class of bacterial lipid and fatty acid transporters.

  • Organizational Affiliation

    Department of Chemistry and Sarafan ChEM-H Institute, Stanford University, Stanford, CA, 94305, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TPR_REGION domain-containing protein218Enhygromyxa salinaMutation(s): 0 
Gene Names: DB30_08039
Find proteins for A0A0C1ZR44 (Enhygromyxa salina)
Explore A0A0C1ZR44 
Go to UniProtKB:  A0A0C1ZR44
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0C1ZR44
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.03 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.945α = 90
b = 59.029β = 90
c = 62.543γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2023-05-24
    Type: Initial release
  • Version 1.1: 2023-08-09
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Refinement description