Quantum Chemical Calculations of the NHA Bound Nitric Oxide Synthase Active Site:  O2Binding and Implications for the Catalytic Mechanism

2004 ◽  
Vol 126 (33) ◽  
pp. 10267-10270 ◽  
Author(s):  
Kyung-Bin Cho ◽  
James W. Gauld
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Quantum Chemical Calculations ◽  
Active Site ◽  
Quantum Chemical ◽  
Catalytic Mechanism ◽  
Oxide Synthase

New hypotheses for the binding mode of 4- and 7-substituted indazoles in the active site of neuronal nitric oxide synthase

2012 ◽  
Vol 20 (17) ◽  
pp. 5296-5304 ◽  
Author(s):  
Elodie Lohou ◽  
Jana Sopkova-de Oliveira Santos ◽  
Pascale Schumann-Bard ◽  
Michel Boulouard ◽  
Silvia Stiebing ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Active Site ◽  
Neuronal Nitric Oxide Synthase ◽  
Binding Mode ◽  
Oxide Synthase

Active-Site Structure Analysis of Recombinant Human Inducible Nitric Oxide Synthase Using Imidazole

Biochemistry ◽  
1996 ◽  
Vol 35 (29) ◽  
pp. 9567-9575 ◽  
Author(s):  
Renee M. Chabin ◽  
Ermenegilda McCauley ◽  
Jimmy R. Calaycay ◽  
Theresa M. Kelly ◽  
Karen L. MacNaul ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Structure Analysis ◽  
Inducible Nitric Oxide Synthase ◽  
Active Site ◽  
Site Structure ◽  
Active Site Structure ◽  
Oxide Synthase ◽  
Inducible Nitric Oxide

Compound I of Nitric Oxide Synthase:  The Active Site Protonation State

2007 ◽  
Vol 129 (11) ◽  
pp. 3182-3188 ◽  
Author(s):  
Kyung-Bin Cho ◽  
Etienne Derat ◽  
Sason Shaik
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Active Site ◽  
Protonation State ◽  
Compound I ◽  
Oxide Synthase

Mapping the active site polarity in structures of endothelial nitric oxide synthase heme domain complexed with isothioureas

2000 ◽  
Vol 81 (3) ◽  
pp. 133-139 ◽  
Author(s):  
Huiying Li ◽  
C.S. Raman ◽  
Pavel Martásek ◽  
Vladimir Král ◽  
Bettie Sue S. Masters ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Active Site ◽  
Endothelial Nitric Oxide Synthase ◽  
Heme Domain ◽  
Oxide Synthase ◽  
Endothelial Nitric Oxide

Interaction of 5-methyltetrahydrofolate and tetrahydrobiopterin on endothelial function

2002 ◽  
Vol 282 (6) ◽  
pp. H2167-H2172 ◽  
Author(s):  
Mathew Eric Hyndman ◽  
Subodh Verma ◽  
Robin J. Rosenfeld ◽  
Todd J. Anderson ◽  
Howard G. Parsons
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Endothelial Function ◽  
Active Site ◽  
Superoxide Production ◽  
Oxide Synthase

The present study was designed to investigate the interaction between 5-methyltetrahydrofolate and tetrahydrobiopterin in modulating endothelial function. Tetrahydrobiopterin is a critical cofactor for nitric oxide synthase and maintains this enzyme as a nitric oxide- versus superoxide-producing enzyme. The structure of 5-methyltetrahydrofolate is similar to tetrahydrobiopterin and both agents have been shown to improve endothelium-dependent vasodilatation. We hypothesized that 5-methyltetrahydrofolate interacts with nitric oxide synthase in a fashion analogous, yet independent, of tetrahydrobiopterin to improve endothelial function. We demonstrate that 5-methyltetrahydrofolate binds the active site of nitric oxide synthase and mimics the orientation of tetrahydrobiopterin. Furthermore, 5-methyltetrahydrofolate attenuates superoxide production (induced by inhibition of tetrahydrobiopterin synthesis) and improves endothelial function in aortae isolated from tetrahydrobiopterin-deficient rats. We suggest that 5-methyltetrahydrofolate directly interacts with nitric oxide synthase to promote nitric oxide (vs. superoxide) production and improve endothelial function. 5-Methyltetrahydrofolate may represent an important strategy for intervention aimed at improving tetrahydrobiopterin bioavailability.

Asymmetric Synthesis of Conformationally Restrictedl-Arginine Analogues as Active Site Probes of Nitric Oxide Synthase

1999 ◽  
Vol 64 (10) ◽  
pp. 3467-3475 ◽  
Author(s):  
Robert N. Atkinson ◽  
Lisa Moore ◽  
Joseph Tobin ◽  
S. Bruce King
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Asymmetric Synthesis ◽  
Active Site ◽  
Oxide Synthase

scholarly journals Calmodulin Induced Changes in the Active Site of Nitric Oxide Synthase

2019 ◽  
Vol 33 (S1) ◽  
Author(s):  
Austin Johnny Sanchez ◽  
Raymond Esquerra ◽  
Ruszel Refuerzo
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Active Site ◽  
Induced Changes ◽  
Oxide Synthase

scholarly journals Probing the heme-thiolate oxygenase domain of inducible nitric oxide synthase with Ru(II) and Re(I) electron tunneling wires

2008 ◽  
Vol 12 (09) ◽  
pp. 971-978 ◽  
Author(s):  
Charlotte A. Whited ◽  
Wendy Belliston-Bittner ◽  
Alexander R. Dunn ◽  
Jay R. Winkler ◽  
Harry B. Gray
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Active Site ◽  
Electron Tunneling ◽  
Reaction Intermediates ◽  
Rapid Generation ◽  
Oxygenase Domain ◽  
Oxide Synthase ◽  
Rate Limiting ◽  
Inducible Nitric Oxide

Nitric oxide synthase (NOS) catalyzes the production of nitric oxide from L-arginine and dioxygen at a thiolate-ligated heme active site. Although many of the reaction intermediates are as yet unidentified, it is well established that the catalytic cycle begins with substrate binding and rate-limiting electron transfer to the heme. Here, we show that Ru (II)-diimine and Re (I)-diimine electron tunneling wires trigger nanosecond photoreduction of the active-site heme in the enzyme. Very rapid generation of a reduced thiolate-ligated heme opens the way for direct observation of short-lived intermediates in the NOS reaction cycle.

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