1DEI image
Deposition Date 1996-05-15
Release Date 1997-06-16
Last Version Date 2024-11-13
Entry Detail
PDB ID:
1DEI
Keywords:
HORMONE
Title:
DESHEPTAPEPTIDE (B24-B30) INSULIN
Biological Source:
Source Organism:
Sus scrofa (Taxon ID: 9823)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.60 Å
R-Value Free:
0.21
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
1DEI validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:INSULIN
Gene (Uniprot):INS
Mutations:CHAIN B, DEL(24-30)
Chain IDs:A, C
Chain Length:21
Number of Molecules:2
Biological Source:Sus scrofa
UniProt ID:P01315
Protein Blast
Polymer Type:polypeptide(L)
Molecule:INSULIN
Gene (Uniprot):INS
Mutations:CHAIN B, DEL(24-30)
Chain IDs:B, D
Chain Length:23
Number of Molecules:2
Biological Source:Sus scrofa
UniProt ID:P01315
Primary Citation
Crystal structure of desheptapeptide(B24-B30)insulin at 1.6 A resolution: implications for receptor binding.
Proc.Natl.Acad.Sci.USA 94 2975 2980 (1997)
PMID: 9096331 DOI: 10.1073/pnas.94.7.2975

Abstact

The crystal structure of desheptapeptide (B24-B30) insulin (DHPI), a virtually inactive analog of insulin, was determined at 1.6 A resolution. In the refined structure model, DHPI retains three alpha-helices (A1-A8, A12-A18, and B9-B19) as its structural framework, while great conformational changes occur in the N and C termini of B-chain. The beta-turn, which lies in B20-B30 in insulin and insulin analogs with high potency, no longer exists in DHPI. Relative motion is observed among the three alpha-helices, each as a rigid functional group. In contrast, a region covering B5-B6 and A6-A11 exhibits a relatively stable conformation. We interpret our results as identifying: (i) the importance of beta-turn in determining the receptor-binding potency of insulin and (ii) a leading role of PheB24 in maintaining the beta-turn structure.

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Primary Citation of related structures
1DEI