1SSZ

Conformational mapping of mini-b: an n-terminal/c-terminal construct of surfactant protein b using 13c-enhanced fourier transform infrared (FTIR) spectroscopy


Experimental Data Snapshot

  • Method: INFRARED SPECTROSCOPY

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The role of charged amphipathic helices in the structure and function of surfactant protein B.

Waring, A.J.Walther, F.J.Gordon, L.M.Hernandez-Juviel, J.M.Hong, T.Sherman, M.A.Alonso, C.Alig, T.Braun, A.Bacon, D.Zasadzinski, J.A.

(2005) J.Pept.Res. 66: 364-374

  • DOI: 10.1111/j.1399-3011.2005.00300.x

  • PubMed Abstract: 
  • Surfactant protein B (SP-B) is essential for normal lung surfactant function. Theoretical models predict that the disulfide cross-linked, N- and C-terminal domains of SP-B fold as charged amphipathic helices, and suggest that these adjacent helices p ...

    Surfactant protein B (SP-B) is essential for normal lung surfactant function. Theoretical models predict that the disulfide cross-linked, N- and C-terminal domains of SP-B fold as charged amphipathic helices, and suggest that these adjacent helices participate in critical surfactant activities. This hypothesis is tested using a disulfide-linked construct (Mini-B) based on the primary sequences of the N- and C-terminal domains. Consistent with theoretical predictions of the full-length protein, both isotope-enhanced Fourier transform infrared (FTIR) spectroscopy and molecular modeling confirm the presence of charged amphipathic alpha-helices in Mini-B. Similar to that observed with native SP-B, Mini-B in model surfactant lipid mixtures exhibits marked in vitro activity, with spread films showing near-zero minimum surface tensions during cycling using captive bubble surfactometry. In vivo, Mini-B shows oxygenation and dynamic compliance that compare favorably with that of full-length SP-B. Mini-B variants (i.e. reduced disulfides or cationic residues replaced by uncharged residues) or Mini-B fragments (i.e. unlinked N- and C-terminal domains) produced greatly attenuated in vivo and in vitro surfactant properties. Hence, the combination of structure and charge for the amphipathic alpha-helical N- and C-terminal domains are key to SP-B function.


    Organizational Affiliation

    Department of Medicine, Division of Infectious Diseases, UCLA School of Medicine, Center for Health Sciences, Los Angeles, CA 90095, USA. awaring@ucla.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pulmonary surfactant-associated protein B
A
34Homo sapiensMutation(s): 0 
Gene Names: SFTPB (SFTP3)
Find proteins for P07988 (Homo sapiens)
Go to Gene View: SFTPB
Go to UniProtKB:  P07988
Experimental Data & Validation

Experimental Data

  • Method: INFRARED SPECTROSCOPY

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-06-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance