Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C5  (3D View)
Global Stoichiometry: Homo 5-mer - A5 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 30.90 kDa 
• Atom Count: 2135 
• Residue Count: 260 
• Unique protein chains: 1

2M3B

Serine 16 phosphorylated phospholamban pentamer, Hybrid solution and solid-state NMR structural ensemble

• DOI: 10.2210/pdb2M3B/pdb
• BMRB: 18952

• Classification: MEMBRANE PROTEIN
• Organism(s): Oryctolagus cuniculus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2013-01-15 Released: 2013-10-30 
• Deposition Author(s): Vostrikov, V.V., Verardi, R., Veglia, G.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

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• Method: SOLID-STATE NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Literature

Structural Dynamics and Topology of Phosphorylated Phospholamban Homopentamer Reveal Its Role in the Regulation of Calcium Transport.

Vostrikov, V.V., Mote, K.R., Verardi, R., Veglia, G.

(2013) Structure 21: 2119-2130

• PubMed: 24207128 
• DOI: 10.1016/j.str.2013.09.008
• Primary Citation of Related Structures:  
  2M3B


• PubMed Abstract: 
  

Phospholamban (PLN) inhibits the sarco(endo)plasmic reticulum Ca²⁺-ATPase (SERCA), thereby regulating cardiac diastole. In membranes, PLN assembles into homopentamers that in both the phosphorylated and nonphosphorylated states have been proposed to form ion-selective channels. Here, we determined the structure of the phosphorylated pentamer using a combination of solution and solid-state nuclear magnetic resonance methods. We found that the pinwheel architecture of the homopentamer is preserved upon phosphorylation, with each monomer having an L-shaped conformation. The TM domains form a hydrophobic pore approximately 24 Å long and 2 Å in diameter, which is inconsistent with canonical Ca²⁺-selective channels. Phosphorylation, however, enhances the conformational dynamics of the cytoplasmic region of PLN, causing partial unwinding of the amphipathic helix. We propose that PLN oligomers act as storage for active monomers, keeping SERCA function within a physiological window.

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Organizational Affiliation: 

Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cardiac phospholamban	A, B, C, D, E	52	Oryctolagus cuniculus	Mutation(s): 0  Gene Names: PLN
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  P-type ATPase	Protein:  Phospholamban homopentamer in phosphorylated state
Find proteins for P61015 (Oryctolagus cuniculus) Explore P61015  Go to UniProtKB:  P61015

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	A,B,C,D,E	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 
• OLDERADO: 2M3B Olderado

• Method: SOLID-STATE NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-01-15 
• Released Date: 2013-10-30 
Deposition Author(s): Vostrikov, V.V., Verardi, R., Veglia, G.

Revision History 

• Version 1.0: 2013-10-30
  Type: Initial release
  
• Version 1.1: 2013-12-04
  Changes: Database references
• Version 1.2: 2013-12-11
  Changes: Database references