Macromolecule Content

• Total Structure Weight: 15.62 kDa 
• Atom Count: 1091 
• Residue Count: 134 
• Unique protein chains: 1

2OQP

Solution structure of human interleukin-21

• DOI: 10.2210/pdb2OQP/pdb

• Classification: CYTOKINE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli str. K-12 substr. W3110
• Mutation(s): No 


• Deposited: 2007-02-01 Released: 2007-06-19 
• Deposition Author(s): Bondensgaard, K., Breinholt, J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 64 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

The existence of multiple conformers of interleukin-21 directs engineering of a superpotent analogue.

Bondensgaard, K., Breinholt, J., Madsen, D., Omkvist, D.H., Kang, L., Worsaae, A., Becker, P., Schiodt, C.B., Hjorth, S.A.

(2007) J Biol Chem 282: 23326-23336

• PubMed: 17565991 
• DOI: 10.1074/jbc.M701313200
• Primary Citation of Related Structures:  
  2OQP


• PubMed Abstract: 
  

The high resolution three-dimensional structure of human interleukin (hIL)-21 has been resolved by heteronuclear NMR spectroscopy. Overall, the hIL-21 structure is dominated by a well defined central four-helical bundle, arranged in an up-up-down-down topology, as observed for other cytokines. A segment of the hIL-21 molecule that includes the third helical segment, helix C, is observed to exist in two distinct and interchangeable states. In one conformer, the helix C segment is presented in a regular, alpha-helical conformation, whereas in the other conformer, this segment is largely disordered. A structure-based sequence alignment of hIL-21 with receptor complexes of the related cytokines, interleukin-2 and -4, implied that this particular segment is involved in receptor binding. An hIL-21 analog was designed to stabilize the region around helix C through the introduction of a segment grafted from hIL-4. This novel hIL-21 analog was demonstrated to exhibit a 10-fold increase in potency in a cellular assay.

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Organizational Affiliation: 

Novo Nordisk A/S, Biopharmaceuticals Research Unit, DK-2760 Måløv, Denmark. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Interleukin-21	A	134	Homo sapiens	Mutation(s): 0  Gene Names: IL21
Find proteins for Q9HBE4 (Homo sapiens) Explore Q9HBE4  Go to UniProtKB:  Q9HBE4
NIH Common Fund Data Resources
PHAROS:  Q9HBE4 GTEx:  ENSG00000138684

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 64 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2OQP Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-02-01 
• Released Date: 2007-06-19 
Deposition Author(s): Bondensgaard, K., Breinholt, J.

Revision History 

• Version 1.0: 2007-06-19
  Type: Initial release
  
• Version 1.1: 2007-10-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance