2K6T

Solution structure of the relaxin-like factor


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Solution structure of a conformationally restricted fully active derivative of the human relaxin-like factor

Bullesbach, E.E.Hass, M.A.S.Jensen, M.R.Hansen, D.F.Kristensen, S.M.Schwabe, C.Led, J.J.

(2008) Biochemistry 47: 13308-13317

  • Primary Citation of Related Structures:  2K6U

  • PubMed Abstract: 
  • Analogous to insulin, the relaxin-like factor (RLF) must undergo a structural transition to the active form prior to receptor binding. Thus, the C-terminus of the B chain of RLF folds toward the surface of the central B chain helix, causing partial o ...

    Analogous to insulin, the relaxin-like factor (RLF) must undergo a structural transition to the active form prior to receptor binding. Thus, the C-terminus of the B chain of RLF folds toward the surface of the central B chain helix, causing partial obliteration of the two essential RLF receptor-binding site residues, valine B19 and tryptophan B27. Via comparison of the solution structure of a fully active C-terminally cross-linked RLF analogue with the native synthetic human RLF (hRLF), it became clear that the cross-linked analogue largely retains the essential folding of the native protein. Both proteins exist in a major and minor conformation, as revealed by multiple resonances from tryptophan B27 and adjacent residues on the B chain helix. Notably, the minor conformation is significantly more highly populated in the chemically cross-linked RLF than it is in the hRLF. In addition, compared to the unmodified molecule, subtle differences are observed within the B chain helix whereby the cross-linked derivative shows a reduced level of hydrogen bonding and significant peak broadening at the binding site residue ValB19. On the basis of these observations, we suggest that the solution structure of the native hormone represents an inactive conformer and that a dynamic equilibrium exists between the C-terminally unfolded binding conformation and the inactive conformation of the RLF.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Medical University of South Carolina, 173 Ashley Avenue, P.O. Box 250509, Charleston, South Carolina 29425, USA. bullesee@musc.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Insulin-like 3 A chain
A
26Homo sapiensGene Names: INSL3 (RLF, RLNL)
Find proteins for P51460 (Homo sapiens)
Go to Gene View: INSL3
Go to UniProtKB:  P51460
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Insulin-like 3 B chain
B
31Homo sapiensGene Names: INSL3 (RLF, RLNL)
Find proteins for P51460 (Homo sapiens)
Go to Gene View: INSL3
Go to UniProtKB:  P51460
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2K6T Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-12-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance