5JYQ

Structure of Conus Geographus insulin G1


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.4 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

  • 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 segme ...

    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 PheB24 is mitigated. These findings may facilitate efforts to design ultrarapid-acting therapeutic insulins.


    Organizational Affiliation

    Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Insulin 1
A
20Conus geographusMutation(s): 0 
Find proteins for A0A0B5AC95 (Conus geographus)
Go to UniProtKB:  A0A0B5AC95
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Insulin 1b
B
23Conus geographusMutation(s): 0 
Find proteins for A0A0B5A8Q2 (Conus geographus)
Go to UniProtKB:  A0A0B5A8Q2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
CY3
Query on CY3
A
L-PEPTIDE LINKINGC3 H8 N2 O SCYS
HYP
Query on HYP
B
L-PEPTIDE LINKINGC5 H9 N O3PRO
CGU
Query on CGU
A, B
L-PEPTIDE LINKINGC6 H9 N O6GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.211 
  • Space Group: P 4 3 2
Unit Cell:
Length (Å)Angle (°)
a = 74.910α = 90.00
b = 74.910β = 90.00
c = 74.910γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXrefinement
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (Australia)AustraliaAPP1058233
European CommissionCONBIOS 330486
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM 48677

Revision History 

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