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| | {{STRUCTURE_3mth| PDB=3mth | SCENE= }} | | {{STRUCTURE_3mth| PDB=3mth | SCENE= }} |
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| - | '''X-RAY CRYSTALLOGRAPHIC STUDIES ON HEXAMERIC INSULINS IN THE PRESENCE OF HELIX-STABILIZING AGENTS, THIOCYANATE, METHYLPARABEN AND PHENOL'''
| + | ===X-RAY CRYSTALLOGRAPHIC STUDIES ON HEXAMERIC INSULINS IN THE PRESENCE OF HELIX-STABILIZING AGENTS, THIOCYANATE, METHYLPARABEN AND PHENOL=== |
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| - | ==Overview==
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| - | Three X-ray crystallographic studies have been carried out on pig insulin in the presence of three ligands, thiocyanate, methylparaben (methyl p-hydroxybenzoate), and phenol. In each case, rhombohedral crystals were obtained, which diffracted to 1.8, 1.9, and 2.3 A, respectively. Each crystal structure was very similar to that of 4-zinc pig insulin, which was used as a starting model for PROLSQ refinement (Collaborative Computational Project, Number 4, 1994). The R factors for the refined structures of thiocyanate insulin, methylparaben insulin, and phenol insulin were 19.6, 18.4, and 19.1, respectively. Each crystal structure consists of T3R3f insulin hexamers with two zinc ions per hexamer. In the R3f trimer of the thiocyanate insulin hexamer, one thiocyanate ion is coordinated to the zinc on the hexamer 3-fold axis, but there is no evidence of zinc ion binding in the off-axis zinc ion sites seen in the 4-zinc pig insulin structure. In the methylparaben insulin and phenol insulin hexamers, the phenolic ligands are bound at the dimer-dimer interfaces in the R3f trimers in a manner similar to that of phenol in R6 phenol insulin. The binding of methylparaben appears to make the hexamer more compact by drawing the A and the B chains closer together in the binding site. In all three structures presented herein, the conformations of the first three residues of the B chain in the R3f trimer are extended rather than alpha-helical, as is seen in R6 phenol insulin. The energetics of ligand binding in the insulin hexamer are discussed.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_7492558}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 7492558 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_7492558}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Whittingham, J L.]] | | [[Category: Whittingham, J L.]] |
| | [[Category: Hormone]] | | [[Category: Hormone]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:07:40 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 12:56:49 2008'' |
Revision as of 09:56, 3 July 2008
Template:STRUCTURE 3mth
X-RAY CRYSTALLOGRAPHIC STUDIES ON HEXAMERIC INSULINS IN THE PRESENCE OF HELIX-STABILIZING AGENTS, THIOCYANATE, METHYLPARABEN AND PHENOL
Template:ABSTRACT PUBMED 7492558
About this Structure
3MTH is a Protein complex structure of sequences from Sus scrofa. This structure supersedes the now removed PDB entry 2mth. Full crystallographic information is available from OCA.
Reference
X-ray crystallographic studies on hexameric insulins in the presence of helix-stabilizing agents, thiocyanate, methylparaben, and phenol., Whittingham JL, Chaudhuri S, Dodson EJ, Moody PC, Dodson GG, Biochemistry. 1995 Nov 28;34(47):15553-63. PMID:7492558
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