Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 10-mer - A4B4C2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 10-mer - A2B2C2D2E1F1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 234.79 kDa 
• Atom Count: 14,878 
• Modelled Residue Count: 1,810 
• Deposited Residue Count: 2,016 
• Unique protein chains: 3

 7MQR

The insulin receptor ectodomain in complex with four venom hybrid insulins - symmetric conformation

• PDB DOI: 10.2210/pdb7MQR/pdb
• EM Map EMD-23950: EMDB EMDataResource

• Classification: HORMONE,TOXIN
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): Yes 


• Deposited: 2021-05-06 Released: 2022-03-16 
• Deposition Author(s): Blakely, A.D., Xiong, X., Kim, J.H., Menting, J., Schafer, I.B., Schubert, H.L., Agrawal, R., Gutmann, T., Delaine, C., Zhang, Y., Artik, G.O., Merriman, A., Eckert, D., Lawrence, M.C., Coskun, U., Fisher, S.J., Forbes, B.E., Safavi-Hemami, H., Hill, C.P., Chou, D.H.C.
• Funding Organization(s): Not funded

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Symmetric and asymmetric receptor conformation continuum induced by a new insulin.

Xiong, X., Blakely, A., Kim, J.H., Menting, J.G., Schafer, I.B., Schubert, H.L., Agrawal, R., Gutmann, T., Delaine, C., Zhang, Y.W., Artik, G.O., Merriman, A., Eckert, D., Lawrence, M.C., Coskun, U., Fisher, S.J., Forbes, B.E., Safavi-Hemami, H., Hill, C.P., Chou, D.H.

(2022) Nat Chem Biol 18: 511-519

• PubMed: 35289328 
• DOI: 10.1038/s41589-022-00981-0
• Primary Citation of Related Structures:  
  7MQO, 7MQR, 7MQS


• PubMed Abstract: 
  

Cone snail venoms contain a wide variety of bioactive peptides, including insulin-like molecules with distinct structural features, binding modes and biochemical properties. Here, we report an active humanized cone snail venom insulin with an elongated A chain and a truncated B chain, and use cryo-electron microscopy (cryo-EM) and protein engineering to elucidate its interactions with the human insulin receptor (IR) ectodomain. We reveal how an extended A chain can compensate for deletion of B-chain residues, which are essential for activity of human insulin but also compromise therapeutic utility by delaying dissolution from the site of subcutaneous injection. This finding suggests approaches to developing improved therapeutic insulins. Curiously, the receptor displays a continuum of conformations from the symmetric state to a highly asymmetric low-abundance structure that displays coordination of a single humanized venom insulin using elements from both of the previously characterized site 1 and site 2 interactions.

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Organizational Affiliation: 

Department of Biochemistry, University of Utah, Salt Lake City, UT, USA. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Insulin A chain	A, D [auth C], F [auth G], H [auth I]	24	Homo sapiens	Mutation(s): 1  Gene Names: INS
UniProt & NIH Common Fund Data Resources
Find proteins for P01308 (Homo sapiens) Explore P01308  Go to UniProtKB:  P01308
PHAROS:  P01308

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Insulin B chain	B, E [auth D], G [auth H], I [auth J]	22	Homo sapiens	Mutation(s): 2  Gene Names: INS
UniProt & NIH Common Fund Data Resources
Find proteins for P01308 (Homo sapiens) Explore P01308  Go to UniProtKB:  P01308
PHAROS:  P01308

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Isoform Short of Insulin receptor	C [auth E], J [auth F]	916	Homo sapiens	Mutation(s): 0  Gene Names: INSR EC: 2.7.10.1
UniProt & NIH Common Fund Data Resources
Find proteins for P06213 (Homo sapiens) Explore P06213  Go to UniProtKB:  P06213
PHAROS:  P06213

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	AA [auth F], BA [auth F], CA [auth F], DA [auth F], K [auth E], L [auth E], M [auth E], N [auth E], O [auth E], P [auth E], Q [auth E], R [auth E], S [auth E], T [auth E], U [auth F], V [auth F], W [auth F], X [auth F], Y [auth F], Z [auth F]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX
RECONSTRUCTION	cryoSPARC	3.2

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2022-03-16 
Deposition Author(s): Blakely, A.D., Xiong, X., Kim, J.H., Menting, J., Schafer, I.B., Schubert, H.L., Agrawal, R., Gutmann, T., Delaine, C., Zhang, Y., Artik, G.O., Merriman, A., Eckert, D., Lawrence, M.C., Coskun, U., Fisher, S.J., Forbes, B.E., Safavi-Hemami, H., Hill, C.P., Chou, D.H.C.

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Funding Organization	Location	Grant Number
Not funded		--

Revision History  

• Version 1.0: 2022-03-16
  Type: Initial release
  
• Version 1.1: 2023-03-29
  Changes: Database references