1BOM

THREE-DIMENSIONAL STRUCTURE OF BOMBYXIN-II, AN INSULIN-RELATED BRAIN-SECRETORY PEPTIDE OF THE SILKMOTH BOMBYX MORI: COMPARISON WITH INSULIN AND RELAXIN


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional solution structure of bombyxin-II an insulin-like peptide of the silkmoth Bombyx mori: structural comparison with insulin and relaxin.

Nagata, K.Hatanaka, H.Kohda, D.Kataoka, H.Nagasawa, H.Isogai, A.Ishizaki, H.Suzuki, A.Inagaki, F.

(1995) J.Mol.Biol. 253: 749-758

  • DOI: 10.1006/jmbi.1995.0588
  • Primary Citation of Related Structures:  1BON

  • PubMed Abstract: 
  • The three-dimensional solution structure of bombyxin-II, an insulin-like two-chain peptide produced by the brain of the silkworm Bombyx mori, has been determined by simulated annealing calculations based on 535 distance constraints and 24 torsion-ang ...

    The three-dimensional solution structure of bombyxin-II, an insulin-like two-chain peptide produced by the brain of the silkworm Bombyx mori, has been determined by simulated annealing calculations based on 535 distance constraints and 24 torsion-angle constraints derived from NMR data and three distance constraints of the disulfide bonds. To our knowledge, this is the first three-dimensional structure determined for an invertebrate insulin-related peptide. The root-mean-square deviations between the best 10 structures and the mean structure are 0.58(+/- 0.15) A for the backbone heavy atoms (N, C alpha, C) and 1.03(+/- 0.18) A for all non-hydrogen atom if less well-defined N and C termini (A1, A20, B(-2) to B4 and B23 to B25) are excluded. The overall main-chain structure of bombyxin-II is similar to that of insulin. However, there are significant conformational and functional differences in their B-chain C-terminal parts. The B-chain C-terminal part of bombyxin-II adopts an extension of the B-chain central helix like that of relaxin and is not required for bombyxin activity, while the corresponding part of insulin adopts a sharp turn and a beta-strand and is essential for insulin activity. This structure demonstrates that bombyxin-II is more closely related to relaxin than to insulin, and suggests that insulin might have evolved the additional receptor-recognition site in the B-chain C-terminal beta-strand to distinguish itself from bombyxin and relaxin. The structure of bombyxin-II thus provides novel insights into the receptor recognition and divergent molecular evolution of insulin-superfamily peptides.


    Organizational Affiliation

    Department of Molecular Physiology, Tokyo Metropolitan Institute of Medical Science, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BOMBYXIN-II,BOMBYXIN A-2
A
20Bombyx moriGene Names: BBXA2
Find proteins for P15411 (Bombyx mori)
Go to UniProtKB:  P15411
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
BOMBYXIN-II,BOMBYXIN A-6
B
28Bombyx moriGene Names: BBXA6
Find proteins for P26729 (Bombyx mori)
Go to UniProtKB:  P26729
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
B
L-PEPTIDE LINKINGC5 H7 N O3GLU
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-11-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance