6UCJ

proIAPP in DPC Micelles - Two-Conformer Ensemble Refinement, Open Conformer


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 800 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Pro-islet amyloid polypeptide in micelles contains a helical prohormone segment.

DeLisle, C.F.Malooley, A.L.Banerjee, I.Lorieau, J.L.

(2020) FEBS J 287: 4440-4457

  • DOI: https://doi.org/10.1111/febs.15253
  • Primary Citation of Related Structures:  
    6UCJ, 6UCK

  • PubMed Abstract: 

    Pro-islet amyloid polypeptide (proIAPP) is the prohormone precursor molecule to IAPP, also known as amylin. IAPP is a calcitonin family peptide hormone that is cosecreted with insulin, and largely responsible for hunger satiation and metabolic homeostasis. Amyloid plaques containing mixtures of mature IAPP and misprocessed proIAPP deposit on, and destroy pancreatic β-cell membranes, and they are recognized as a clinical hallmark of type 2 diabetes mellitus. In order to better understand the interaction with cellular membranes, we solved the solution NMR structure of proIAPP bound to dodecylphosphocholine micelles at pH 4.5. We show that proIAPP is a dynamic molecule with four α-helices. The first two helices are contained within the mature IAPP sequence, while the second two helices are part of the C-terminal prohormone segment (Cpro). We mapped the membrane topology of the amphipathic helices by paramagnetic relaxation enhancement, and we used CD and diffusion-ordered spectroscopy to identify environmental factors that impact proIAPP membrane affinity. We discuss how our structural results relate to prohormone processing based on the varied pH environments and lipid compositions of organelle membranes within the regulated secretory pathway, and the likelihood of Cpro survival for cosecretion with IAPP. DATABASE: The assigned resonances have been deposited in the Biological Magnetic Resonance Bank (BMRB) with accession numbers 50007 and 50019 for proIAPP and Cpro, respectively. The lowest energy structures have been deposited in the Protein Data Bank (PDB) with access codes 6UCJ and 6UCK.


  • Organizational Affiliation

    Department of Chemistry, University of Illinois at Chicago, Chicago, IL, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Islet amyloid polypeptide72Homo sapiensMutation(s): 0 
Gene Names: IAPP
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P10997 (Homo sapiens)
Explore P10997 
Go to UniProtKB:  P10997
PHAROS:  P10997
GTEx:  ENSG00000121351 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10997
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 800 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesMCB1651598

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-26
    Type: Initial release
  • Version 1.1: 2020-03-04
    Changes: Database references
  • Version 1.2: 2020-10-28
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Database references, Other