Macromolecule Content

• Total Structure Weight: 30572.88 
• Atom Count: 2110 
• Residue Count: 260 
• Unique protein chains: 1

1ZLL

NMR Structure of Unphosphorylated Human Phospholamban Pentamer

• DOI: 10.2210/pdb1ZLL/pdb

• Classification: MEMBRANE PROTEIN/SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2005-05-06 Released: 2005-08-09 
• Deposition Author(s): Oxenoid, K., Chou, J.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 30 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

The structure of phospholamban pentamer reveals a channel-like architecture in membranes

Oxenoid, K., Chou, J.J.

(2005) Proc.Natl.Acad.Sci.USA 102: 10870-10875

• PubMed: 16043693 
• DOI: 10.1073/pnas.0504920102


• PubMed Abstract: 
  

Contraction and relaxation of heart muscle cells is regulated by cycling of calcium between cytoplasm and sarcoplasmic reticulum. Human phospholamban (PLN), expressed in the sarcoplasmic reticulum membrane as a 30-kDa homopentamer, controls cellular calcium levels by a mechanism that depends on its phosphorylation. Since PLN was discovered approximately 30 years ago, extensive studies have aimed to explain how it influences calcium pumps and to determine whether it acts as an ion channel. We have determined by solution NMR methods the atomic resolution structure of an unphosphorylated PLN pentamer in dodecylphosphocholine micelles. The unusual bellflower-like assembly is held together by leucine/isoleucine zipper motifs along the membrane-spanning helices. The structure reveals a channel-forming architecture that could allow passage of small ions. The central pore gradually widens toward the cytoplasmic end as the transmembrane helices twist around each other and bend outward. The dynamic N-terminal amphipathic helices point away from the membrane, perhaps facilitating recognition and inhibition of the calcium pump.

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Organizational Affiliation: 

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Cardiac phospholamban	A, B, C, D, E	52	Homo sapiens	Mutation(s): 0  Gene Names: PLN (PLB)
Membrane protein mpstruct	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  P-type ATPase	Protein:  Phospholamban homopentamer
Find proteins for P26678 (Homo sapiens) Go to Gene View: PLN Go to UniProtKB:  P26678

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 30 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• Olderado: 1ZLL Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-05-06 
• Released Date: 2005-08-09 
• Deposition Author(s): Oxenoid, K., Chou, J.J.

Revision History 

• Version 1.0: 2005-08-09
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance