Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 26.44 kDa 
• Atom Count: 1819 
• Residue Count: 228 
• Unique protein chains: 1

4HTS

Crystal Structure of Twin Arginine Translocase Receptor- TatC

• DOI: 10.2210/pdb4HTS/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Aquifex aeolicus VF5
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2012-11-01 Released: 2013-05-01 
• Deposition Author(s): Ramasamy, S., Chartron, J.W., Clemons Jr., W.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 4.00 Å
• R-Value Free: 0.323 
• R-Value Work: 0.288 
• R-Value Observed: 0.292 

Literature

The Glove-like Structure of the Conserved Membrane Protein TatC Provides Insight into Signal Sequence Recognition in Twin-Arginine Translocation.

Ramasamy, S., Abrol, R., Suloway, C.J., Clemons, W.M.

(2013) Structure 21: 777-788

• PubMed: 23583035 
• DOI: 10.1016/j.str.2013.03.004
• Primary Citation of Related Structures:  
  4HTS, 4HTT


• PubMed Abstract: 
  

In bacteria, two signal-sequence-dependent secretion pathways translocate proteins across the cytoplasmic membrane. Although the mechanism of the ubiquitous general secretory pathway is becoming well understood, that of the twin-arginine translocation pathway, responsible for translocation of folded proteins across the bilayer, is more mysterious. TatC, the largest and most conserved of three integral membrane components, provides the initial binding site of the signal sequence prior to pore assembly. Here, we present two crystal structures of TatC from the thermophilic bacteria Aquifex aeolicus at 4.0 Å and 6.8 Å resolution. The membrane architecture of TatC includes a glove-shaped structure with a lipid-exposed pocket predicted by molecular dynamics to distort the membrane. Correlating the biochemical literature to these results suggests that the signal sequence binds in this pocket, leading to structural changes that facilitate higher order assemblies.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sec-independent protein translocase protein TatC	A	236	Aquifex aeolicus VF5	Mutation(s): 2  Gene Names: tatC, aq_1267
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  Sec, Translocase, and Insertase Proteins	Protein:  TatC twin-arginine translocase receptor
Find proteins for O67305 (Aquifex aeolicus (strain VF5)) Explore O67305  Go to UniProtKB:  O67305

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 4.00 Å
• R-Value Free: 0.323 
• R-Value Work: 0.288 
• R-Value Observed: 0.292 
• Space Group: P 4₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 109.78	α = 90
b = 109.78	β = 90
c = 107.02	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PHASER	phasing
REFMAC	refinement
HKL-2000	data reduction
SCALA	data scaling
Blu-Ice	data collection

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-11-01 
• Released Date: 2013-05-01 
Deposition Author(s): Ramasamy, S., Chartron, J.W., Clemons Jr., W.M.

Revision History 

• Version 1.0: 2013-05-01
  Type: Initial release
  
• Version 1.1: 2013-05-29
  Changes: Database references
• Version 1.2: 2019-07-17
  Changes: Advisory, Data collection, Refinement description