5WBT

Solution Structure and Dynamics of an Ultra-Stable Single-Chain Insulin Analog STUDIES OF AN ENGINEERED MONOMER AND IMPLICATIONS FOR RECEPTOR BINDING

  • Classification: HORMONE
  • Organism(s): Homo sapiens
  • Expression System: Pichia
  • Mutation(s): No 

  • Deposited: 2017-06-29 Released: 2017-11-15 
  • Deposition Author(s): Glidden, M.D., Yang, Y., Wickramasinghe, N.P., Weiss, M.A.
  • Funding Organization(s): National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 98 
  • Conformers Submitted: 19 
  • Selection Criteria: structures with acceptable covalent geometry 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Solution structure of an ultra-stable single-chain insulin analog connects protein dynamics to a novel mechanism of receptor binding.

Glidden, M.D., Yang, Y., Smith, N.A., Phillips, N.B., Carr, K., Wickramasinghe, N.P., Ismail-Beigi, F., Lawrence, M.C., Smith, B.J., Weiss, M.A.

(2018) J Biol Chem 293: 69-88

  • DOI: 10.1074/jbc.M117.808667
  • Primary Citation of Related Structures:  
    5WBT

  • PubMed Abstract: 

    • Domain-minimized insulin receptors (IRs) have enabled crystallographic analysis of insulin-bound "micro-receptors." In such structures, the C-terminal segment of the insulin B chain inserts between conserved IR domains, unmasking an invariant receptor-binding surface that spans both insulin A and B chains ...

    Domain-minimized insulin receptors (IRs) have enabled crystallographic analysis of insulin-bound "micro-receptors." In such structures, the C-terminal segment of the insulin B chain inserts between conserved IR domains, unmasking an invariant receptor-binding surface that spans both insulin A and B chains. This "open" conformation not only rationalizes the inactivity of single-chain insulin (SCI) analogs (in which the A and B chains are directly linked), but also suggests that connecting (C) domains of sufficient length will bind the IR. Here, we report the high-resolution solution structure and dynamics of such an active SCI. The hormone's closed-to-open transition is foreshadowed by segmental flexibility in the native state as probed by heteronuclear NMR spectroscopy and multiple conformer simulations of crystallographic protomers as described in the companion article. We propose a model of the SCI's IR-bound state based on molecular-dynamics simulations of a micro-receptor complex. In this model, a loop defined by the SCI's B and C domains encircles the C-terminal segment of the IR α-subunit. This binding mode predicts a conformational transition between an ultra-stable closed state (in the free hormone) and an active open state (on receptor binding). Optimization of this switch within an ultra-stable SCI promises to circumvent insulin's complex global cold chain. The analog's biphasic activity, which serendipitously resembles current premixed formulations of soluble insulin and microcrystalline suspension, may be of particular utility in the developing world.

    Organizational Affiliation: 

    Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
InsulinA57Homo sapiensMutation(s): 0 
Gene Names: INS
UniProt & NIH Common Fund Data Resources
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
PHAROS:  P01308
Entity Groups  
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UniProt GroupP01308
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 98 
  • Conformers Submitted: 19 
  • Selection Criteria: structures with acceptable covalent geometry 
  • OLDERADO: 5WBT Olderado

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesR01 DK040949
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United StatesR01 DK069764
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)United States1F30DK104618-01
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5T32GM007250-38

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-15
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Database references
  • Version 1.2: 2018-01-17
    Changes: Database references
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence, Data collection