5JYQ

Structure of Conus Geographus insulin G1

  • Classification: HORMONE
  • Organism(s): Conus geographus
  • Mutation(s): No 

  • Deposited: 2016-05-15 Released: 2016-09-07 
  • Deposition Author(s): Lawrence, M.C., Menting, J., Norton, R.S., Safavi-Hemami, H.
  • Funding Organization(s): National Health and Medical Research Council (NHMRC, Australia), European Commission, National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.212 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

A minimized human insulin-receptor-binding motif revealed in a Conus geographus venom insulin.

Menting, J.G.Gajewiak, J.MacRaild, C.A.Chou, D.H.Disotuar, M.M.Smith, N.A.Miller, C.Erchegyi, J.Rivier, J.E.Olivera, B.M.Forbes, B.E.Smith, B.J.Norton, R.S.Safavi-Hemami, H.Lawrence, M.C.

(2016) Nat Struct Mol Biol 23: 916-920

  • DOI: 10.1038/nsmb.3292
  • Primary Citation of Related Structures:  
    5JYQ

  • PubMed Abstract: 
  • Insulins in the venom of certain fish-hunting cone snails facilitate prey capture by rapidly inducing hypoglycemic shock. One such insulin, Conus geographus G1 (Con-Ins G1), is the smallest known insulin found in nature and lacks the C-terminal segment of the B chain that, in human insulin, mediates engagement of the insulin receptor and assembly of the hormone's hexameric storage form ...

    Insulins in the venom of certain fish-hunting cone snails facilitate prey capture by rapidly inducing hypoglycemic shock. One such insulin, Conus geographus G1 (Con-Ins G1), is the smallest known insulin found in nature and lacks the C-terminal segment of the B chain that, in human insulin, mediates engagement of the insulin receptor and assembly of the hormone's hexameric storage form. Removal of this segment (residues B23-B30) in human insulin results in substantial loss of receptor affinity. Here, we found that Con-Ins G1 is monomeric, strongly binds the human insulin receptor and activates receptor signaling. Con-Ins G1 thus is a naturally occurring B-chain-minimized mimetic of human insulin. Our crystal structure of Con-Ins G1 reveals a tertiary structure highly similar to that of human insulin and indicates how Con-Ins G1's lack of an equivalent to the key receptor-engaging residue Phe B24 is mitigated. These findings may facilitate efforts to design ultrarapid-acting therapeutic insulins.


    Organizational Affiliation

    Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin 1A20Conus geographusMutation(s): 0 
Find proteins for A0A0B5AC95 (Conus geographus)
Explore A0A0B5AC95 
Go to UniProtKB:  A0A0B5AC95
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin 1bB23Conus geographusMutation(s): 0 
Find proteins for A0A0B5A8Q2 (Conus geographus)
Explore A0A0B5A8Q2 
Go to UniProtKB:  A0A0B5A8Q2
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
CGU
Query on CGU
AL-PEPTIDE LINKINGC6 H9 N O6GLU
CY3
Query on CY3
AL-PEPTIDE LINKINGC3 H8 N2 O SCYS
HYP
Query on HYP
BL-PEPTIDE LINKINGC5 H9 N O3PRO
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.212 
  • Space Group: P 4 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.91α = 90
b = 74.91β = 90
c = 74.91γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)AustraliaAPP1058233
European CommissionCONBIOS 330486
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM 48677

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-07
    Type: Initial release
  • Version 1.1: 2016-09-14
    Changes: Database references
  • Version 1.2: 2016-09-28
    Changes: Database references
  • Version 1.3: 2016-10-19
    Changes: Database references
  • Version 1.4: 2017-09-20
    Changes: Author supporting evidence, Data collection, Derived calculations
  • Version 1.5: 2019-12-25
    Changes: Author supporting evidence, Derived calculations