1KMR

Solution NMR Structure of Surfactant Protein B (11-25) (SP-B11-25)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 78 
  • Conformers Submitted: 17 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

NMR structure of lung surfactant peptide SP-B(11-25).

Kurutz, J.W.Lee, K.Y.

(2002) Biochemistry 41: 9627-9636

  • DOI: https://doi.org/10.1021/bi016077x
  • Primary Citation of Related Structures:  
    1KMR

  • PubMed Abstract: 

    Surfactant protein B (SP-B) is a 79-residue essential component of lung surfactant, the film of lipid and protein lining the alveoli, and is the subject of great interest for its role in lung surfactant replacement therapies. Here we report circular dichroism results and the solution NMR structure of SP-B(11-25) (CRALIKRIQAMIPKG) dissolved in CD(3)OH at 5 degrees C. This is the first report of NMR data related to the protein SP-B, whose structure promises to help elucidate the mechanism of its function. Sequence-specific resonance assignments were made for all observable (1)H NMR signals on the basis of standard 2D NMR methods. Structures were determined by the simulated annealing method using restraints derived from 2D NOESY data. The calculations yielded 17 energy-minimized structures, three of which were subjected to 0.95 ns of restrained dynamics to assess the relevance of the static structures to more realistic dynamic behavior. Our CD and NMR data confirm that this segment is an amphiphilic alpha helix from approximately residue L14 through M21. The backbone heavy-atom RMSD for residues L14 through M21 is 0.09 +/- 0.12 A, and the backbone heavy-atom RMSD for the whole peptide is 0.96 +/- 2.45 A, the difference reflecting fraying at the termini. Aside from the disordered termini, the minimized structures represent dynamic structures well. Structural similarity to the homologous regions of related saposin-like proteins and the importance of the distribution of polar residues about the helix axis are discussed.


  • Organizational Affiliation

    Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, University of Chicago, 5735 S. Ellis Ave., Chicago, Illinois 60637, USA. jkurutz@uchicago.edu


Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PULMONARY SURFACTANT-ASSOCIATED PROTEIN B15N/AMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P07988 (Homo sapiens)
Explore P07988 
Go to UniProtKB:  P07988
PHAROS:  P07988
GTEx:  ENSG00000168878 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07988
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 78 
  • Conformers Submitted: 17 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-07
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-22
    Changes: Data collection