Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 8.67 kDa 
• Atom Count: 611 
• Residue Count: 81 
• Unique protein chains: 1

2M67

Full-length mercury transporter protein MerF in lipid bilayer membranes

• DOI: 10.2210/pdb2M67/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Morganella morganii
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-03-27 Released: 2013-07-03 
• Deposition Author(s): Lu, G.J., Tian, Y., Vora, N., Marassi, F.M., Opella, S.J.

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Experimental Data Snapshot

• Method: SOLID-STATE NMR
• Conformers Calculated: 200 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

The Structure of the Mercury Transporter MerF in Phospholipid Bilayers: A Large Conformational Rearrangement Results from N-Terminal Truncation.

Lu, G.J., Tian, Y., Vora, N., Marassi, F.M., Opella, S.J.

(2013) J Am Chem Soc 135: 9299-9302

• PubMed: 23763519 
• DOI: 10.1021/ja4042115
• Primary Citation of Related Structures:  
  2M67


• PubMed Abstract: 
  

The three-dimensional structure of the 81-residue mercury transporter MerF determined in liquid crystalline phospholipid bilayers under physiological conditions by Rotationally Aligned (RA) solid-state NMR has two long helices, which extend well beyond the bilayer, with a well-defined interhelical loop. Truncation of the N-terminal 12 residues, which are mobile and unstructured when the protein is solubilized in micelles, results in a large structural rearrangement of the protein in bilayers. In the full-length protein, the N-terminal helix is aligned nearly parallel to the membrane normal and forms an extension of the first transmembrane helix. By contrast, this helix adopts a perpendicular orientation in the truncated protein. The close spatial proximity of the two Cys-containing metal binding sites in the three-dimensional structure of full-length MerF provides insights into possible transport mechanisms. These results demonstrate that major changes in protein structure can result from differences in amino acid sequence (e.g., full-length vs truncated proteins) as well as the use of a non-native membrane mimetic environment (e.g., micelles) vs liquid crystalline phospholipid bilayers. They provide further evidence of the importance of studying unmodified membrane proteins in near-native bilayer environments in order to obtain accurate structures that can be related to their functions.

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Organizational Affiliation: 

Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0307, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MerF	A	81	Morganella morganii	Mutation(s): 0  Gene Names: merF
Find proteins for Q56446 (Morganella morganii) Explore Q56446  Go to UniProtKB:  Q56446

Experimental Data & Validation

Experimental Data

• Method: SOLID-STATE NMR
• Conformers Calculated: 200 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2M67 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-03-27 
• Released Date: 2013-07-03 
Deposition Author(s): Lu, G.J., Tian, Y., Vora, N., Marassi, F.M., Opella, S.J.

Revision History 

• Version 1.0: 2013-07-03
  Type: Initial release
  
• Version 1.1: 2013-07-10
  Changes: Database references