3G7W

Islet Amyloid Polypeptide (IAPP or Amylin) Residues 1 to 22 fused to Maltose Binding Protein

• PDB DOI: https://doi.org/10.2210/pdb3G7W/pdb

• Classification: Sugar binding protein, Hormone
• Organism(s): Escherichia coli K-12, Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2009-02-11 Released: 2009-06-23 
• Deposition Author(s): Wiltzius, J.J.W., Sawaya, M.R., Eisenberg, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.194 
• R-Value Work: 0.170 
• R-Value Observed: 0.171 

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PQS (software)

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 45.54 kDa 
• Atom Count: 3,574 
• Modelled Residue Count: 393 
• Deposited Residue Count: 393 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Maltose-binding periplasmic protein, Islet amyloid polypeptide fusion protein	A	393	Escherichia coli K-12, Homo sapiens This entity is chimeric	Mutation(s): 3  Gene Names: malE, b4034, JW3994, IAPP
UniProt & NIH Common Fund Data Resources
Find proteins for P0AEX9 (Escherichia coli (strain K12)) Explore P0AEX9  Go to UniProtKB:  P0AEX9
Find proteins for P10997 (Homo sapiens) Explore P10997  Go to UniProtKB:  P10997
PHAROS:  P10997 GTEx:  ENSG00000121351
UniProt Groups	P0AEX9P10997

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose	B	3		N/A
Glycosylation Resources
GlyTouCan:  G96370VA GlyCosmos:  G96370VA GlyGen:  G96370VA

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth A], O [auth A], P [auth A], Q [auth A], R [auth A], S [auth A], T [auth A], U [auth A], V [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
GOL	W [auth A], X [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900009	B	alpha-maltotriose	Oligosaccharide / Nutrient

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.194 
• R-Value Work: 0.170 
• R-Value Observed: 0.171 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 84.495	α = 90
b = 84.495	β = 90
c = 144.292	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
BOS	data collection

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-06-23 
Deposition Author(s): Wiltzius, J.J.W., Sawaya, M.R., Eisenberg, D.

Revision History  

• Version 1.0: 2009-06-23
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Derived calculations, Version format compliance
• Version 1.2: 2017-08-16
  Changes: Refinement description, Source and taxonomy
• Version 1.3: 2017-11-01
  Changes: Refinement description
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary
• Version 2.1: 2021-10-20
  Changes: Database references, Structure summary
• Version 2.2: 2023-09-06
  Changes: Data collection, Refinement description