3LFK

A reported archaeal mechanosensitive channel is a structural homolog of MarR-like transcriptional regulators

• PDB DOI: https://doi.org/10.2210/pdb3LFK/pdb

• Classification: UNKNOWN FUNCTION
• Organism(s): Thermoplasma volcanium GSS1
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-01-17 Released: 2010-04-14 
• Deposition Author(s): Liu, Z., Walton, T.A., Rees, D.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.228 
• R-Value Work: 0.211 
• R-Value Observed: 0.211 

Literature

A reported archaeal mechanosensitive channel is a structural homolog of MarR-like transcriptional regulators.

Liu, Z., Walton, T.A., Rees, D.C.

(2010) Protein Sci 19: 808-814

• PubMed: 20162616 
• DOI: https://doi.org/10.1002/pro.360
• Primary Citation of Related Structures:  
  3LFK


• PubMed Abstract: 
  

  Several archaeal mechanosensitive (MS) channels have been reported, including one from Thermoplasma volcanium designated MscTV. Here, we report the crystal structure of MscTV at 1.6-A resolution. Unexpectedly, MscTV was found to be a water-soluble protein exhibiting a winged helix-turn-helix (wHTH) motif, which is the signature of the MarR (multiple antibiotic resistance regulator) family of transcriptional regulators. A cell-based osmotic downshock functional assay demonstrated that MscTV was unable to protect a knockout strain of Escherichia coli from hypoosmotic shock, further indicating that it does not function as a MS channel. We propose this protein be renamed MLPTv for MarR-like protein from T. volcanium.

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Organizational Affiliation: 

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Biological Assembly 3  

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

Biological assembly 3 assigned by authors.

Biological Assembly 4  

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

Biological assembly 4 assigned by authors.

Macromolecule Content

• Total Structure Weight: 58.92 kDa 
• Atom Count: 4,227 
• Modelled Residue Count: 455 
• Deposited Residue Count: 516 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MarR Like Protein, TVG0766549	A, B, C, D	129	Thermoplasma volcanium GSS1	Mutation(s): 0  Gene Names: TV0762, TVG0766549
UniProt
Find proteins for Q97AP8 (Thermoplasma volcanium (strain ATCC 51530 / DSM 4299 / JCM 9571 / NBRC 15438 / GSS1)) Explore Q97AP8  Go to UniProtKB:  Q97AP8

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CIT	I [auth D]	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N
SO4	E [auth A], F [auth B], G [auth B], H [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.228 
• R-Value Work: 0.211 
• R-Value Observed: 0.211 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 65.13	α = 90
b = 88.335	β = 90
c = 115.212	γ = 90

Software Package:

Software Name	Purpose
Blu-Ice	data collection
SHELXS	phasing
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-04-14 
Deposition Author(s): Liu, Z., Walton, T.A., Rees, D.C.

Revision History  

• Version 1.0: 2010-04-14
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2024-02-21
  Changes: Data collection, Database references, Derived calculations