1dmk: Difference between revisions

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[[Image:1dmk.gif|left|200px]]
{{Seed}}
[[Image:1dmk.png|left|200px]]


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{{STRUCTURE_1dmk|  PDB=1dmk  |  SCENE=  }}  
{{STRUCTURE_1dmk|  PDB=1dmk  |  SCENE=  }}  


'''BOVINE ENDOTHELIAL NITRIC OXIDE SYNTHASE HEME DOMAIN COMPLEXED WITH 4-AMINO-6-PHENYL-TETRAHYDROPTERIDINE'''
===BOVINE ENDOTHELIAL NITRIC OXIDE SYNTHASE HEME DOMAIN COMPLEXED WITH 4-AMINO-6-PHENYL-TETRAHYDROPTERIDINE===




==Overview==
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Pathological nitric oxide (NO) generation in sepsis, inflammation, and stroke may be therapeutically controlled by inhibiting NO synthases (NOS). Here we targeted the (6R)-5,6,7,8-tetrahydro-l-biopterin (H(4)Bip)-binding site of NOS, which, upon cofactor binding, maximally increases enzyme activity and NO production from substrate l-arginine. The first generation of H(4)Bip-based NOS inhibitors employed a 4-amino pharmacophore of H(4)Bip analogous to antifolates such as methotrexate. We developed a novel series of 4-oxo-pteridine derivatives that were screened for inhibition against neuronal NOS (NOS-I) and a structure-activity relationship was determined. To understand the structural basis for pterin antagonism, selected derivatives were docked into the NOS pterin binding cavity. Using a reduced 4-oxo-pteridine scaffold, derivatives with certain modifications such as electron-rich aromatic phenyl or benzoyl groups at the 5- and 6-positions, were discovered to markedly inhibit NOS-I, possibly due to hydrophobic and electrostatic interactions with Phe(462) and Ser(104), respectively, within the pterin binding pocket. One of the most effective 4-oxo compounds and, for comparisons an active 4-amino derivative, were then co-crystallized with the endothelial NOS (NOS-III) oxygenase domain and this structure solved to confirm the hypothetical binding modes. Collectively, these findings suggest (i) that, unlike the antifolate principle, the 4-amino substituent is not essential for developing pterin-based NOS inhibitors and (ii), provide a steric and electrostatic basis for their rational design.
The line below this paragraph, {{ABSTRACT_PUBMED_11590164}}, adds the Publication Abstract to the page
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{{ABSTRACT_PUBMED_11590164}}


==About this Structure==
==About this Structure==
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[[Category: Taghavi-Moghadam, S.]]
[[Category: Taghavi-Moghadam, S.]]
[[Category: Alpha-beta fold]]
[[Category: Alpha-beta fold]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 14:01:24 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 23:17:57 2008''

Revision as of 20:17, 30 June 2008

File:1dmk.png

Template:STRUCTURE 1dmk

BOVINE ENDOTHELIAL NITRIC OXIDE SYNTHASE HEME DOMAIN COMPLEXED WITH 4-AMINO-6-PHENYL-TETRAHYDROPTERIDINE

Template:ABSTRACT PUBMED 11590164

About this Structure

1DMK is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

Reference

Structural basis for pterin antagonism in nitric-oxide synthase. Development of novel 4-oxo-pteridine antagonists of (6R)-5,6,7,8-tetrahydrobiopterin., Kotsonis P, Frohlich LG, Raman CS, Li H, Berg M, Gerwig R, Groehn V, Kang Y, Al-Masoudi N, Taghavi-Moghadam S, Mohr D, Munch U, Schnabel J, Martasek P, Masters BS, Strobel H, Poulos T, Matter H, Pfleiderer W, Schmidt HH, J Biol Chem. 2001 Dec 28;276(52):49133-41. Epub 2001 Oct 5. PMID:11590164

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