1qiw
From Proteopedia
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| - | [[Image:1qiw.jpg|left|200px]] | + | [[Image:1qiw.jpg|left|200px]] |
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| - | '''CALMODULIN COMPLEXED WITH N-(3,3,-DIPHENYLPROPYL)-N'-[1-R-(3,4-BIS-BUTOXYPHENYL)-ETHYL]-PROPYLENEDIAMINE (DPD)''' | + | {{Structure |
| + | |PDB= 1qiw |SIZE=350|CAPTION= <scene name='initialview01'>1qiw</scene>, resolution 2.30Å | ||
| + | |SITE= <scene name='pdbsite=A1:Ca+Binding+Site'>A1</scene>, <scene name='pdbsite=A2:Ca+Binding+Site'>A2</scene>, <scene name='pdbsite=A3:Ca+Binding+Site'>A3</scene>, <scene name='pdbsite=A4:Ca+Binding+Site'>A4</scene>, <scene name='pdbsite=B1:Ca+Binding+Site'>B1</scene>, <scene name='pdbsite=B2:Ca+Binding+Site'>B2</scene>, <scene name='pdbsite=B3:Ca+Binding+Site'>B3</scene> and <scene name='pdbsite=B4:Ca+Binding+Site'>B4</scene> | ||
| + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene> and <scene name='pdbligand=DPD:N-(3,3,-DIPHENYLPROPYL)-N'-[1-R-(2 3,4-BIS-BUTOXYPHENYL)-ETHYL]-PROPYLENEDIAMINE'>DPD</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''CALMODULIN COMPLEXED WITH N-(3,3,-DIPHENYLPROPYL)-N'-[1-R-(3,4-BIS-BUTOXYPHENYL)-ETHYL]-PROPYLENEDIAMINE (DPD)''' | ||
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==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1QIW is a [ | + | 1QIW is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QIW OCA]. |
==Reference== | ==Reference== | ||
| - | A new potent calmodulin antagonist with arylalkylamine structure: crystallographic, spectroscopic and functional studies., Harmat V, Bocskei Z, Naray-Szabo G, Bata I, Csutor AS, Hermecz I, Aranyi P, Szabo B, Liliom K, Vertessy BG, Ovadi J, J Mol Biol. 2000 Mar 31;297(3):747-55. PMID:[http:// | + | A new potent calmodulin antagonist with arylalkylamine structure: crystallographic, spectroscopic and functional studies., Harmat V, Bocskei Z, Naray-Szabo G, Bata I, Csutor AS, Hermecz I, Aranyi P, Szabo B, Liliom K, Vertessy BG, Ovadi J, J Mol Biol. 2000 Mar 31;297(3):747-55. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10731425 10731425] |
[[Category: Bos taurus]] | [[Category: Bos taurus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: calcium-binding protein]] | [[Category: calcium-binding protein]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:38:10 2008'' |
Revision as of 11:38, 20 March 2008
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| , resolution 2.30Å | |||||||
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| Sites: | , , , , , , and | ||||||
| Ligands: | and | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CALMODULIN COMPLEXED WITH N-(3,3,-DIPHENYLPROPYL)-N'-[1-R-(3,4-BIS-BUTOXYPHENYL)-ETHYL]-PROPYLENEDIAMINE (DPD)
Overview
An arylalkylamine-type calmodulin antagonist, N-(3, 3-diphenylpropyl)-N'-[1-R-(3, 4-bis-butoxyphenyl)ethyl]-propylene-diamine (AAA) is presented and its complexes with calmodulin are characterized in solution and in the crystal. Near-UV circular dichroism spectra show that AAA binds to calmodulin with 2:1 stoichiometry in a Ca(2+)-dependent manner. The crystal structure with 2:1 stoichiometry is determined to 2.64 A resolution. The binding of AAA causes domain closure of calmodulin similar to that obtained with trifluoperazine. Solution and crystal data indicate that each of the two AAA molecules anchors in the hydrophobic pockets of calmodulin, overlapping with two trifluoperazine sites, i.e. at a hydrophobic pocket and an interdomain site. The two AAA molecules also interact with each other by hydrophobic forces. A competition enzymatic assay has revealed that AAA inhibits calmodulin-activated phosphodiesterase activity at two orders of magnitude lower concentration than trifluoperazine. The apparent dissociation constant of AAA to calmodulin is 18 nM, which is commensurable with that of target peptides. On the basis of the crystal structure, we propose that the high-affinity binding is mainly due to a favorable entropy term, as the AAA molecule makes multiple contacts in its complex with calmodulin.
About this Structure
1QIW is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.
Reference
A new potent calmodulin antagonist with arylalkylamine structure: crystallographic, spectroscopic and functional studies., Harmat V, Bocskei Z, Naray-Szabo G, Bata I, Csutor AS, Hermecz I, Aranyi P, Szabo B, Liliom K, Vertessy BG, Ovadi J, J Mol Biol. 2000 Mar 31;297(3):747-55. PMID:10731425
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