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- EMDB-9878: Cryo EM density map of Resveratrol-stabilized bioactive insulin o... -

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Basic information

Entry
Database: EMDB / ID: EMD-9878
TitleCryo EM density map of Resveratrol-stabilized bioactive insulin oligomer
Map data
SampleInsulin oligomer and Resveratrol complex:
Insulin A chain / Insulin B chain
Function / homology
Function and homology information


Signaling by Insulin receptor / negative regulation of glycogen catabolic process / alpha-beta T cell activation / Insulin processing / IRS activation / Insulin receptor recycling / negative regulation of NAD(P)H oxidase activity / nitric oxide-cGMP-mediated signaling pathway / negative regulation of feeding behavior / negative regulation of fatty acid metabolic process ...Signaling by Insulin receptor / negative regulation of glycogen catabolic process / alpha-beta T cell activation / Insulin processing / IRS activation / Insulin receptor recycling / negative regulation of NAD(P)H oxidase activity / nitric oxide-cGMP-mediated signaling pathway / negative regulation of feeding behavior / negative regulation of fatty acid metabolic process / regulation of protein secretion / Regulation of gene expression in beta cells / positive regulation of peptide hormone secretion / positive regulation of respiratory burst / negative regulation of respiratory burst involved in inflammatory response / negative regulation of gluconeogenesis / negative regulation of reactive oxygen species biosynthetic process / positive regulation of cellular protein metabolic process / regulation of protein localization to plasma membrane / COPI-mediated anterograde transport / Regulation of insulin secretion / positive regulation of dendritic spine maintenance / Synthesis, secretion, and deacylation of Ghrelin / positive regulation of glycogen biosynthetic process / regulation of cellular amino acid metabolic process / negative regulation of oxidative stress-induced intrinsic apoptotic signaling pathway / positive regulation of nitric oxide mediated signal transduction / FOXO-mediated transcription of oxidative stress, metabolic and neuronal genes / Signal attenuation / negative regulation of lipid catabolic process / negative regulation of protein secretion / positive regulation of lipid biosynthetic process / fatty acid homeostasis / endosome lumen / transport vesicle / positive regulation of insulin receptor signaling pathway / endoplasmic reticulum-Golgi intermediate compartment membrane / neuron projection maintenance / insulin-like growth factor receptor binding / positive regulation of protein autophosphorylation / positive regulation of glycolytic process / negative regulation of acute inflammatory response / regulation of transmembrane transporter activity / positive regulation of cell differentiation / Insulin receptor signalling cascade / positive regulation of mitotic nuclear division / regulation of synaptic plasticity / positive regulation of brown fat cell differentiation / cognition / regulation of protein localization / positive regulation of long-term synaptic potentiation / positive regulation of cytokine production / acute-phase response / activation of protein kinase B activity / positive regulation of glucose import / vasodilation / hormone activity / negative regulation of proteolysis / negative regulation of protein catabolic process / insulin receptor binding / positive regulation of protein localization to nucleus / insulin receptor signaling pathway / glucose metabolic process / Golgi lumen / positive regulation of nitric-oxide synthase activity / cell-cell signaling / glucose homeostasis / wound healing / endoplasmic reticulum to Golgi vesicle-mediated transport / positive regulation of MAPK cascade / PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling / positive regulation of phosphatidylinositol 3-kinase signaling / positive regulation of cell growth / secretory granule lumen / protease binding / positive regulation of NF-kappaB transcription factor activity / positive regulation of cell migration / positive regulation of protein kinase B signaling / Amyloid fiber formation / Golgi membrane / G protein-coupled receptor signaling pathway / amyloid fibril formation / endoplasmic reticulum lumen / regulation of transcription, DNA-templated / positive regulation of gene expression / positive regulation of cell population proliferation / extracellular space / extracellular region / identical protein binding
Similarity search - Function
Insulin / Insulin family / Insulin-like / Insulin / insulin-like growth factor / relaxin family. / Insulin/IGF/Relaxin family / Insulin, conserved site / Insulin-like superfamily / Insulin family signature.
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 14.5 Å
AuthorsSengupta J / Pathak BK / Bhakta S
Funding support India, 3 items
OrganizationGrant numberCountry
Department of Biotechnology (India) India
Council of Scientific & Industrial Research India
Department of Science & Technology (India) India
CitationJournal: J Comput Aided Mol Des / Year: 2020
Title: Resveratrol as a nontoxic excipient stabilizes insulin in a bioactive hexameric form.
Authors: Bani Kumar Pathak / Debajyoti Das / Sayan Bhakta / Partha Chakrabarti / Jayati Sengupta /
Abstract: Insulin aggregation is the leading cause of considerable reduction in the amount of active drug molecules in liquid formulations manufactured for diabetes management. Phenolic compounds, such as ...Insulin aggregation is the leading cause of considerable reduction in the amount of active drug molecules in liquid formulations manufactured for diabetes management. Phenolic compounds, such as phenol and m-cresol, are routinely used to stabilize insulin in a hexameric form during its commercial preparation. However, long term usage of commercial insulin results in various adverse secondary responses, for which toxicity of the phenolic excipients is primarily responsible. In this study we aimed to find out a nontoxic insulin stabilizer. To that end, we have selected resveratrol, a natural polyphenol, as a prospective nontoxic insulin stabilizer because of its structural similarity with commercially used phenolic compounds. Atomic force microscopy visualization of resveratrol-treated human insulin revealed that resveratrol has a unique ability to arrest hINS in a soluble oligomeric form having discrete spherical morphology. Most importantly, resveratrol-treated insulin is nontoxic for HepG2 cells and it effectively maintains low blood glucose in a mouse model. Cryo-electron microscopy revealed 3D morphology of resveratrol-stabilized insulin that strikingly resembles crystal structures of insulin hexamer formulated with m-cresol. Significantly, we found that, in a condition inductive to amyloid fibrillation at physiological pH, resveratrol is capable of stabilizing insulin more efficiently than m-cresol. Thus, this study describes resveratrol as an effective nontoxic natural molecule that can be used for stabilizing insulin in a bioactive oligomeric form during its commercial formulation.
History
DepositionApr 2, 2019-
Header (metadata) releaseApr 22, 2020-
Map releaseApr 22, 2020-
UpdateJul 8, 2020-
Current statusJul 8, 2020Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6jr3
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_9878.map.gz / Format: CCP4 / Size: 8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.89 Å/pix.
x 128 pix.
= 241.92 Å
1.89 Å/pix.
x 128 pix.
= 241.92 Å
1.89 Å/pix.
x 128 pix.
= 241.92 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.89 Å
Density
Contour LevelBy AUTHOR: 0.05 / Movie #1: 0.05
Minimum - Maximum-0.12147528 - 0.2776239
Average (Standard dev.)-0.0000079906 (±0.008368772)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions128128128
Spacing128128128
CellA=B=C: 241.92 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.891.891.89
M x/y/z128128128
origin x/y/z0.0000.0000.000
length x/y/z241.920241.920241.920
α/β/γ90.00090.00090.000
start NX/NY/NZ-200-200-200
NX/NY/NZ401401401
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS128128128
D min/max/mean-0.1210.278-0.000

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Supplemental data

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Sample components

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Entire Insulin oligomer and Resveratrol complex

EntireName: Insulin oligomer and Resveratrol complex / Number of Components: 3

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Component #1: protein, Insulin oligomer and Resveratrol complex

ProteinName: Insulin oligomer and Resveratrol complex / Recombinant expression: No
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Saccharomyces cerevisiae (baker's yeast)

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Component #2: protein, Insulin A chain

ProteinName: Insulin A chain / Number of Copies: 6 / Recombinant expression: No
MassTheoretical: 2.383698 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Saccharomyces cerevisiae (baker's yeast)

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Component #3: protein, Insulin B chain

ProteinName: Insulin B chain / Number of Copies: 6 / Recombinant expression: No
MassTheoretical: 3.433953 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Saccharomyces cerevisiae (baker's yeast)

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Experimental details

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Sample preparation

SpecimenSpecimen State: Particle / Method: cryo EM
Sample solutionpH: 7.4
VitrificationCryogen Name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company
ImagingMicroscope: FEI POLARA 300
Electron gunElectron Source: FIELD EMISSION GUN / Accelerating Voltage: 300 kV / Electron Dose: 10 e/Å2 / Illumination Mode: FLOOD BEAM
LensImaging Mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: FEI EAGLE (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Number of Projections: 11000
3D reconstructionSoftware: SPIDER / Resolution: 14.5 Å / Resolution Method: FSC 0.143 CUT-OFF
FSC plot (resolution estimation)

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Atomic model buiding

Modeling #1Input PDB model: 1EV6
Output model

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