3INS

STRUCTURE OF INSULIN. RESULTS OF JOINT NEUTRON AND X-RAY REFINEMENT

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Work: 0.182 
  • Method: NEUTRON DIFFRACTION
  • Resolution: 2.2 Å

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

Literature

Structure of insulin: results of joint neutron and X-ray refinement.

Wlodawer, A., Savage, H., Dodson, G.

(1989) Acta Crystallogr.,Sect.B 45: 99-107


  • PubMed Abstract: 

    • Neutron diffraction data for porcine 2Zn insulin were collected to 2.2 A resolution from a single crystal deuterated by slow exchange of mother liquor. A joint neutron/X-ray restrained-least-squares refinement was undertaken using the neutron data, a ...

    Neutron diffraction data for porcine 2Zn insulin were collected to 2.2 A resolution from a single crystal deuterated by slow exchange of mother liquor. A joint neutron/X-ray restrained-least-squares refinement was undertaken using the neutron data, as well as the 1.5 A resolution X-ray data collected previously. The final R factors were 0.182 for the X-ray data and 0.191 for the neutron data. Resulting atomic coordinates were compared with the initial X-ray model, showing a total r.m.s. shift of 0.36 A for the protein and 0.6 A for the solvent. Protonation of a number of individual amino acids was investigated by analysis of the neutron maps. No D atoms were found between the carboxylates of Glu B13 which make an intermolecular contact, suggesting nonbonded interaction rather than the predicted hydrogen bond. Amide hydrogen exchange was investigated in a refinement of their atomic occupancies. Regions of unexchanged amide groups were found in the center of the B helices. The results of this study emphasize the limited amount of information available in neutron diffraction studies of proteins at resolution lower than 2 A.

    Related Citations: 
    • Experience with Fast Fourier Least Squares in the Refinement of the Crystal Structure of Rhombohedral 2-Zinc Insulin at 1.5 Angstroms Resolution
      Isaacs, N.W.,Agarwal, R.C.
      (1978) Acta Crystallogr.,Sect.A 34: 782

    Organizational Affiliation: 

    Center for Chemical Physics, National Bureau of Standards, Gaithersburg, MD 20899.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INSULIN (CHAIN A)
A, C
21Sus scrofaMutation(s): 0 
Gene Names: INS
Find proteins for P01315 (Sus scrofa)
Go to Gene View: INS
Go to UniProtKB:  P01315
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
INSULIN (CHAIN B)
B, D
30Sus scrofaMutation(s): 0 
Gene Names: INS
Find proteins for P01315 (Sus scrofa)
Go to Gene View: INS
Go to UniProtKB:  P01315
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
B, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
DOD
Query on DOD
Download SDF File 
Download CCD File 
A, B, C, D
DEUTERATED WATER
D2 O
XLYOFNOQVPJJNP-ZSJDYOACSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Work: 0.182 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 82.500α = 90.00
b = 82.500β = 90.00
c = 34.000γ = 120.00
  • Method: NEUTRON DIFFRACTION
  • Resolution: 2.2 Å
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1989-01-09
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Data collection, Non-polymer description, Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other