Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 11.21 kDa 
• Atom Count: 687 
• Modelled Residue Count: 102 
• Deposited Residue Count: 102 
• Unique protein chains: 1

5MN3

NMR structure of the Littorina littorea metallothionein, a snail MT folding into three distinct domains

• DOI: 10.2210/pdb5MN3/pdb
• BMRB: 34076

• Classification: METAL TRANSPORT
• Organism(s): Littorina littorea
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2016-12-12 Released: 2017-12-20 
• Deposition Author(s): Zerbe, O., Jurt, S., Baumann, C.
• Funding Organization(s): Swiss National Science Foundation

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Structural Adaptation of a Protein to Increased Metal Stress: NMR Structure of a Marine Snail Metallothionein with an Additional Domain.

Baumann, C., Beil, A., Jurt, S., Niederwanger, M., Palacios, O., Capdevila, M., Atrian, S., Dallinger, R., Zerbe, O.

(2017) Angew Chem Int Ed Engl 56: 4617-4622

• PubMed: 28332759 
• DOI: 10.1002/anie.201611873
• Primary Citation of Related Structures:  
  5ML1, 5MN3


• PubMed Abstract: 
  

In this study, we present an NMR structure of the metallothionein (MT) from the snail Littorina littorea (LlMT) in complex with Cd ²⁺ . LlMT is capable of binding 9 Zn ²⁺ or 9 Cd ²⁺ ions. Sequence alignments with other snail MTs revealed that the protein is likely composed of three domains. The study revealed that the protein is divided into three individual domains, each of which folds into a single well-defined three-metal cluster. The central α2 and C-terminal β domains are positioned with a unique relative orientation. Two variants with longer and shorter linkers were investigated, which revealed that specific interdomain contacts only occurred with the wild-type linker. Moreover, a domain-swap mutant in which the highly similar α1 and α2 domains were exchanged was structurally almost identical. It is suggested that the expression of a three-domain MT confers an evolutionary advantage on Littorina littorea in terms of coping with Cd ²⁺ stress and adverse environmental conditions.

---

Organizational Affiliation: 

Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
domain-swapped metallothionein from Littorina Littorea	A	102	Littorina littorea	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CD	A	CADMIUM ION Cd WLZRMCYVCSSEQC-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 5MN3 Olderado

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2016-12-12 
• Released Date: 2017-12-20 
Deposition Author(s): Zerbe, O., Jurt, S., Baumann, C.

---

Funding Organization	Location	Grant Number
Swiss National Science Foundation	Switzerland	I 1482-N28

Revision History  

• Version 1.0: 2017-12-20
  Type: Initial release
  
• Version 1.1: 2019-05-08
  Changes: Data collection
• Version 1.2: 2019-07-03
  Changes: Data collection, Database references