2H8B

Solution structure of INSL3


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations, structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution Structure and Characterization of the LGR8 Receptor Binding Surface of Insulin-like Peptide 3

Rosengren, K.J.Zhang, S.Lin, F.Daly, N.L.Scott, D.J.Hughes, R.A.Bathgate, R.A.D.Craik, D.J.Wade, J.D.

(2006) J.Biol.Chem. 281: 28287-28295

  • DOI: 10.1074/jbc.M603829200

  • PubMed Abstract: 
  • Insulin-like peptide 3 (INSL3), a member of the relaxin peptide family, is produced in testicular Leydig cells and ovarian thecal cells. Gene knock-out experiments have identified a key biological role in initiating testes descent during fetal develo ...

    Insulin-like peptide 3 (INSL3), a member of the relaxin peptide family, is produced in testicular Leydig cells and ovarian thecal cells. Gene knock-out experiments have identified a key biological role in initiating testes descent during fetal development. Additionally, INSL3 has an important function in mediating male and female germ cell function. These actions are elicited via its recently identified receptor, LGR8, a member of the leucine-rich repeat-containing G-protein-coupled receptor family. To identify the structural features that are responsible for the interaction of INSL3 with its receptor, its solution structure was determined by NMR spectroscopy together with in vitro assays of a series of B-chain alanine-substituted analogs. Synthetic human INSL3 was found to adopt a characteristic relaxin/insulin-like fold in solution but is a highly dynamic molecule. The four termini of this two-chain peptide are disordered, and additional conformational exchange is evident in the molecular core. Alanine-substituted analogs were used to identify the key residues of INSL3 that are responsible for the interaction with the ectodomain of LGR8. These include Arg(B16) and Val(B19), with His(B12) and Arg(B20) playing a secondary role, as evident from the synergistic effect on the activity in double and triple mutants involving these residues. Together, these amino acids combine with the previously identified critical residue, Trp(B27), to form the receptor binding surface. The current results provide clear direction for the design of novel specific agonists and antagonists of this receptor.


    Organizational Affiliation

    Department of Chemistry and Biomedical Sciences, University of Kalmar, SE-392 81 Kalmar, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Insulin-like 3
B
31Homo sapiensMutation(s): 0 
Gene 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
A
26Homo sapiensMutation(s): 0 
Gene 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: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations, structures with the lowest energy 
  • Olderado: 2H8B Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-08-01
    Type: Initial release
  • Version 1.1: 2007-10-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance