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1tym

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{{STRUCTURE_1tym| PDB=1tym | SCENE= }}
{{STRUCTURE_1tym| PDB=1tym | SCENE= }}
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'''THE STRUCTURE OF A COMPLEX OF HEXAMERIC INSULIN AND 4'-HYDROXYACETANILIDE'''
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===THE STRUCTURE OF A COMPLEX OF HEXAMERIC INSULIN AND 4'-HYDROXYACETANILIDE===
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==Overview==
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X-ray crystallographic studies have been carried out on human insulin crystals grown in the presence of 4'-hydroxyacetanilide (Tylenol) and show that this nontoxic phenolic derivative can induce the T--&gt;R transition, producing a T3R3 hexamer. Two different crystals, grown under different conditions, are rhombohedral, space group R3, with cell constants a = 81.11, c = 37.97 and a = 80.88, c = 37.60 A. The T3R3 hexamer is symmetric, resulting from the presence of a crystallographic threefold axis, and the asymmetric unit consists of a TR dimer. Data to a resolution of 1.9 A were measured on a crystal from each of the two crystallizations and the structures have been refined to residuals of 0.168 and 0.173. The guest molecule is bound by the R-state monomer through the formation of two hydrogen bonds from the hydroxy group of Tylenol to the carbonyl oxygen and the nitrogen of A6 Cys and A11 Cys, respectively. Due to steric constraints of the phenolic binding site, the acetamide group of Tylenol is rotated approximately 50 degrees out of the plane of the phenyl group and the methyl group is cis; no hydrogen bonds exist between the acetamide group and the hexamer. Although the zinc ion, which is bound to the R-state trimer, has tetrahedral coordination in both structures, the T-state zinc is observed to have octahedral coordination in one structure but tetrahedral coordination in the other. The side chain of A10 Ile in the R-state monomer adopts a high-energy conformation as a result of close contact to a residue in an adjacent dimer and may explain in part the differences between therapeutic preparations of beef insulin, for which A10 is a Val residue, and human insulin.
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(as it appears on PubMed at http://www.pubmed.gov), where 8090735 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8090735}}
==About this Structure==
==About this Structure==
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[[Category: Smith, G D.]]
[[Category: Smith, G D.]]
[[Category: Hormone]]
[[Category: Hormone]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:31:39 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 22:24:43 2008''

Revision as of 19:25, 28 July 2008

Image:1tym.png

Template:STRUCTURE 1tym

THE STRUCTURE OF A COMPLEX OF HEXAMERIC INSULIN AND 4'-HYDROXYACETANILIDE

Template:ABSTRACT PUBMED 8090735

About this Structure

1TYM is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

The structure of a complex of hexameric insulin and 4'-hydroxyacetanilide., Smith GD, Ciszak E, Proc Natl Acad Sci U S A. 1994 Sep 13;91(19):8851-5. PMID:8090735

Page seeded by OCA on Mon Jul 28 22:24:43 2008

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