6T84 | pdb_00006t84

crystal structure of the mycobacterial trehalose monomycolate transport factor A, TtfA

• PDB DOI: https://doi.org/10.2210/pdb6T84/pdb

• Classification: LIPID TRANSPORT
• Organism(s): Mycolicibacterium smegmatis MC2 155
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2019-10-24 Released: 2019-12-25 
• Deposition Author(s): Blaise, M.
• Funding Organization(s): French National Research Agency

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 
  0.199 (Depositor), 0.199 (DCC) 
• R-Value Work: 
  0.174 (Depositor), 0.175 (DCC) 
• R-Value Observed: 
  0.175 (Depositor) 

Literature

The crystal structure of the mycobacterial trehalose monomycolate transport factor A, TtfA, reveals an atypical fold.

Ung, K.L., Alsarraf, H.M.A.B., Kremer, L., Blaise, M.

(2020) Proteins 88: 809-815

• PubMed: 31833106 
• DOI: https://doi.org/10.1002/prot.25863
• Primary Citation Related Structures: 
  6T84


• PubMed Abstract: 
  

  Trehalose monomycolate (TMM) represents an essential element of the mycobacterial envelope. While synthesized in the cytoplasm, TMM is transported across the inner membrane by MmpL3 but, little is known regarding the MmpL3 partners involved in this process. Recently, the TMM transport factor A (TtfA) was found to form a complex with MmpL3 and to participate in TMM transport, although its biological role remains to be established. Herein, we report the crystal structure of the Mycobacterium smegmatis TtfA core domain. The phylogenetic distribution of TtfA homologues in non-mycolate containing bacteria suggests that TtfA may exert additional functions.

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Organizational Affiliation: 
• Institut de Recherche en Infectiologie de Montpellier (IRIM), Université de Montpellier, CNRS UMR 9004, Montpellier, France.
Institut de Recherche en Infectiologie de Montpellier (IRIM), INSERM, Montpellier, France.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 21.61 kDa 
• Atom Count: 1,734 
• Modeled Residue Count: 178 
• Deposited Residue Count: 187 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Uncharacterized protein	A	187	Mycolicibacterium smegmatis MC2 155	Mutation(s): 0  Gene Names: MSMEG_0736
UniProt
Find proteins for A0QQF4 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155)) Explore A0QQF4  Go to UniProtKB:  A0QQF4

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free:  0.199 (Depositor), 0.199 (DCC) 
• R-Value Work:  0.174 (Depositor), 0.175 (DCC) 
• R-Value Observed: 0.175 (Depositor) 

Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 62.24	α = 90
b = 70.09	β = 90
c = 86.01	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
AutoSol	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2019-12-25 
Deposition Author(s): Blaise, M.

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Funding Organization	Location	Grant Number
French National Research Agency	France	ANR-17-CE11-0008-01

Revision History  

• Version 1.0: 2019-12-25
  Type: Initial release
  
• Version 1.1: 2020-05-27
  Changes: Database references
• Version 1.2: 2024-05-15
  Changes: Data collection, Database references