Misfolding of a Human Islet Amyloid Polypeptide at the Lipid Membrane Populates through β-Sheet Conformers without Involving α-Helical Intermediates

2019 ◽  
Vol 141 (5) ◽  
pp. 1941-1948 ◽  
Author(s):  
Junjun Tan ◽  
Jiahui Zhang ◽  
Yi Luo ◽  
Shuji Ye
Keyword(s):  
Lipid Membrane ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide ◽  
Β Sheet

scholarly journals Lipid Modulation in the Formation of β-Sheet Structures. Implications for De Novo Design of Human Islet Amyloid Polypeptide and the Impact on β-Cell Homeostasis

Biomolecules ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1201 ◽  
Author(s):  
Israel Martínez-Navarro ◽  
Raúl Díaz-Molina ◽  
Angel Pulido-Capiz ◽  
Jaime Mas-Oliva ◽  
Ismael Luna-Reyes ◽  
...  
Keyword(s):  
Insulin Secretion ◽  
Membrane Lipids ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Β Cells ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide ◽  
Insulin Granules ◽  
The Impact ◽  
Β Sheet

Human islet amyloid polypeptide (hIAPP) corresponds to a 37-residue hormone present in insulin granules that maintains a high propensity to form β-sheet structures during co-secretion with insulin. Previously, employing a biomimetic approach, we proposed a panel of optimized IAPP sequences with only one residue substitution that shows the capability to reduce amyloidogenesis. Taking into account that specific membrane lipids have been considered as a key factor in the induction of cytotoxicity, in this study, following the same design strategy, we characterize the effect of a series of lipids upon several polypeptide domains that show the highest aggregation propensity. The characterization of the C-native segment of hIAPP (residues F23-Y37), together with novel variants F23R and I26A allowed us to demonstrate an effect upon the formation of β-sheet structures. Our results suggest that zwitterionic phospholipids promote adsorption of the C-native segments at the lipid-interface and β-sheet formation with the exception of the F23R variant. Moreover, the presence of cholesterol did not modify this behavior, and the β-sheet structural transitions were not registered when the N-terminal domain of hIAPP (K1-S20) was characterized. Considering that insulin granules are enriched in phosphatidylserine (PS), the property of lipid vesicles containing negatively charged lipids was also evaluated. We found that these types of lipids promote β-sheet conformational transitions in both the C-native segment and the new variants. Furthermore, these PS/peptides arrangements are internalized in Langerhans islet β-cells, localized in the endoplasmic reticulum, and trigger critical pathways such as unfolded protein response (UPR), affecting insulin secretion. Since this phenomenon was associated with the presence of cytotoxicity on Langerhans islet β-cells, it can be concluded that the anionic lipid environment and degree of solvation are critical conditions for the stability of segments with the propensity to form β-sheet structures, a situation that will eventually affect the structural characteristics and stability of IAPP within insulin granules, thus modifying the insulin secretion.

scholarly journals Bleomycin modulates amyloid aggregation in β-amyloid and hIAPP

RSC Advances ◽  
2020 ◽  
Vol 10 (43) ◽  
pp. 25929-25946 ◽  
Author(s):  
Anchala Kumari ◽  
Ritika Sharma ◽  
Nidhi Shrivastava ◽  
Pallavi Somvanshi ◽  
Abhinav Grover
Keyword(s):  
Islet Amyloid Polypeptide ◽  
Amyloid Β ◽  
Human Islet ◽  
Amyloid Aggregation ◽  
Islet Amyloid ◽  
Dual Inhibitor ◽  
Human Islet Amyloid Polypeptide ◽  
Β Amyloid ◽  
Β Sheet

Bleomycin acts as a dual inhibitor against both amyloid β and human islet amyloid polypeptide by binding to the β-sheet grooves considered as the amyloids hotspot.

Identification of a novel human islet amyloid polypeptide β-sheet domain and factors influencing fibrillogenesis

2001 ◽  
Vol 308 (3) ◽  
pp. 515-525 ◽  
Author(s):  
Emma T.A.S Jaikaran ◽  
Claire E Higham ◽  
Louise C Serpell ◽  
Jesús Zurdo ◽  
Michael Gross ◽  
...  
Keyword(s):  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide ◽  
Factors Influencing ◽  
Β Sheet

Human islet amyloid polypeptide accumulates at similar sites in islets of transgenic mice and humans

Diabetes ◽  
1994 ◽  
Vol 43 (5) ◽  
pp. 640-644 ◽  
Author(s):  
E. J. de Koning ◽  
J. W. Hoppener ◽  
J. S. Verbeek ◽  
C. Oosterwijk ◽  
K. L. van Hulst ◽  
...  
Keyword(s):  
Transgenic Mice ◽  
Islet Amyloid Polypeptide ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

scholarly journals The flanking peptides issue from the maturation of the human islet amyloid polypeptide (hIAPP) slightly modulate hIAPP-fibril formation but not hIAPP-induced cell death

Biochimie ◽  
2020 ◽  
Vol 170 ◽  
pp. 26-35 ◽  
Author(s):  
Shadai Salazar Vazquez ◽  
Bertrand Blondeau ◽  
Pierre Cattan ◽  
Mathieu Armanet ◽  
Ghislaine Guillemain ◽  
...  
Keyword(s):  
Cell Death ◽  
Islet Amyloid Polypeptide ◽  
Fibril Formation ◽  
Human Islet ◽  
Islet Amyloid ◽  
Human Islet Amyloid Polypeptide

scholarly journals Regulation of divalent metal ions to the aggregation and membrane damage of human islet amyloid polypeptide oligomers

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12815-12825
Author(s):  
Yajie Wang ◽  
Feihong Meng ◽  
Tong Lu ◽  
Chunyun Wang ◽  
Fei Li
Keyword(s):  
Metal Ions ◽  
Metal Binding ◽  
Membrane Damage ◽  
Islet Amyloid Polypeptide ◽  
Divalent Metal ◽  
Human Islet ◽  
Divalent Metal Ions ◽  
Islet Amyloid ◽  
Induced Membrane ◽  
Human Islet Amyloid Polypeptide

Their is a counteraction between a decrease in the disruptive ability of metal-associated oligomer species and an increase in the quantity of oligomers promoted by the metal binding in the activity of hIAPP induced membrane damage.

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