2QIU

Structure of Human Arg-Insulin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.203 

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This is version 1.1 of the entry. See complete history. 


Literature

Structural interpretation of reduced insulin activity as seen in the crystal structure of human Arg-insulin

Sreekanth, R., Pattabhi, V., Rajan, S.S.

(2008) Biochimie 90: 467-473

  • DOI: 10.1016/j.biochi.2007.09.012
  • Primary Citation of Related Structures:  
    2QIU

  • PubMed Abstract: 

    • The N-terminal glycine of the A-chain in insulin is reported to be one of the residues that binds to the insulin receptor. Modifications near this region lead to variations in the biological activity of insulin. One such modification viz., an addition of an arginine at the N-terminal A-chain, was reported to possess two-thirds the activity of native insulin ...

    The N-terminal glycine of the A-chain in insulin is reported to be one of the residues that binds to the insulin receptor. Modifications near this region lead to variations in the biological activity of insulin. One such modification viz., an addition of an arginine at the N-terminal A-chain, was reported to possess two-thirds the activity of native insulin. The crystal structure of 2 zinc human arg (A0) insulin has been elucidated to 2A resolution to understand the mechanism of reduction in insulin activity. A conformational transition from T6 to T3R3(f) and a decrease in the surface accessibility of residues in the so called receptor binding region have been observed. The presence of arginine has also induced distortions in the A chain N-terminal helix. The subtle conformational alterations like decrease in surface accessibility, alterations in the charge surface and changes in the relative orientation of the two helices in the A chain may be responsible for the reduction in activity.

    Related Citations: 
    • Structure of insulin in 4-zinc insulin
      Bentley, G., Dodson, E., Dodson, G., Hodgkin, D., Mercola, D.
      (1976) Nature 261: 166
    Organizational Affiliation: 

    Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai, India.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin A, C22Homo sapiensMutation(s): 0 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS:  P01308
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin B, D30Homo sapiensMutation(s): 0 
Gene Names: INS
Find proteins for P01308 (Homo sapiens)
Explore P01308 
Go to UniProtKB:  P01308
NIH Common Fund Data Resources
PHAROS:  P01308
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download Ideal Coordinates CCD File 
B, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.203 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.491α = 90
b = 80.491β = 90
c = 37.64γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
AUTOMARdata reduction
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Derived calculations, Version format compliance