DsbB3 peptide structure in 70% TFE

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

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Folding determinants of disulfide bond forming protein B explored by solution nuclear magnetic resonance spectroscopy.

Hwang, S.Hilty, C.

(2011) Proteins 79: 1365-1375

  • DOI: https://doi.org/10.1002/prot.22877
  • Primary Citation of Related Structures:  
    2L0L, 2L0M, 2L0N, 2L0O

  • PubMed Abstract: 

    The two-stage model for membrane protein folding postulates that individual helices form first and are subsequently packed against each other. To probe the two-stage model, the structures of peptides representing individual transmembrane helices of the disulfide bond forming protein B have been studied in trifluoroethanol solution as well as in detergent micelles using nuclear magnetic resonance (NMR) and circular dichroism spectroscopy. In TFE solution, peptides showed well-defined α-helical structures. Peptide structures in TFE were compared to the structures of full-length protein obtained by X-ray crystallography and NMR. The extent of α-helical secondary structure coincided well, lending support for the two-stage model for membrane protein folding. However, the conformation of some amino acid side chains differs between the structures of peptide and full-length protein. In micellar solution, the peptides also adopted a helical structure, albeit of reduced definition. Using measurements of paramagnetic relaxation enhancement, peptides were confirmed to be embedded in micelles. These observations may indicate that in the native protein, tertiary interactions additionally stabilize the secondary structure of the individual transmembrane helices.

  • Organizational Affiliation

    Department of Chemistry, Center for Biological NMR, Texas A&M University, College Station, Texas 77843, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oxidoreductase that catalyzes reoxidation of DsbA protein disulfide isomerase I30Escherichia coli BW2952Mutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-05-01
    Changes: Data collection, Database references