This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

1jwk

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 13:26, 17 July 2019

Murine Inducible Nitric Oxide Synthase Oxygenase Dimer (Delta 65) with W457A Mutation at Tetrahydrobiopterin Binding Site

Structural highlights

1jwk is a 2 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , , ,
Related:	1jwj
Activity:	Nitric-oxide synthase (NADPH dependent), with EC number 1.14.13.39
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[NOS2_MOUSE] Produces nitric oxide (NO) which is a messenger molecule with diverse functions throughout the body. In macrophages, NO mediates tumoricidal and bactericidal actions. Also has nitrosylase activity and mediates cysteine S-nitrosylation of cytoplasmic target proteins such COX2.^[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

To better understand potential roles of conserved Trp457 of the murine inducible nitric oxide synthase oxygenase domain (iNOS(ox); residues 1-498) in maintaining the structural integrity of the (6R)-5,6,7,8-tetrahydrobiopterin (H(4)B) binding site located at the dimer interface and in supporting H(4)B redox activity, we determined crystallographic structures of W457F and W457A mutant iNOS(ox) dimers (residues 66-498). In W457F iNOS(ox), all the important hydrogen-bonding and aromatic stacking interactions that constitute the H(4)B binding site and that bridge the H(4)B and heme sites are preserved. In contrast, the W457A mutation results in rearrangement of the Arg193 side chain, orienting its terminal guanidinium group almost perpendicular to the ring plane of H(4)B. Although Trp457 is not required for dimerization, both Trp457 mutations led to the increased mobility of the N-terminal H(4)B binding segment (Ser112-Met114), which might indicate reduced stability of the Trp457 mutant dimers. The Trp457 mutant structures show decreased pi-stacking with bound pterin when the wild-type pi-stacking Trp457 position is occupied with the smaller Phe457 in W457F or positive Arg193 in W457A. The reduced pterin pi-stacking in these mutant structures, relative to that in the wild-type, implies stabilization of reduced H(4)B and destabilization of the pterin radical, consequently slowing electron transfer to the heme ferrous-dioxy (Fe(II)O(2)) species during catalysis. These crystal structures therefore aid elucidation of the roles and importance of conserved Trp457 in maintaining the structural integrity of the H(4)B binding site and of H(4)B-bound dimers, and in influencing the rate of electron transfer between H(4)B and heme in NOS catalysis.

Structures of tetrahydrobiopterin binding-site mutants of inducible nitric oxide synthase oxygenase dimer and implicated roles of Trp457.,Aoyagi M, Arvai AS, Ghosh S, Stuehr DJ, Tainer JA, Getzoff ED Biochemistry. 2001 Oct 30;40(43):12826-32. PMID:11669619^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Kim SF, Huri DA, Snyder SH. Inducible nitric oxide synthase binds, S-nitrosylates, and activates cyclooxygenase-2. Science. 2005 Dec 23;310(5756):1966-70. PMID:16373578 doi:http://dx.doi.org/10.1126/science.1119407
↑ Aoyagi M, Arvai AS, Ghosh S, Stuehr DJ, Tainer JA, Getzoff ED. Structures of tetrahydrobiopterin binding-site mutants of inducible nitric oxide synthase oxygenase dimer and implicated roles of Trp457. Biochemistry. 2001 Oct 30;40(43):12826-32. PMID:11669619

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1jwk"

@@ Line 1: / Line 1: @@
 ==Murine Inducible Nitric Oxide Synthase Oxygenase Dimer (Delta 65) with W457A Mutation at Tetrahydrobiopterin Binding Site==
-<StructureSection load='1jwk' size='340' side='right' caption='[[1jwk]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
+<StructureSection load='1jwk' size='340' side='right'caption='[[1jwk]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1jwk]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JWK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1JWK FirstGlance]. <br>
@@ Line 15: / Line 15: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/jw/1jwk_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/jw/1jwk_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 30: / Line 30: @@
 </div>
 <div class="pdbe-citations 1jwk" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Nitric Oxide Synthase|Nitric Oxide Synthase]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
+[[Category: Large Structures]]
 [[Category: Lk3 transgenic mice]]
 [[Category: Aoyagi, M]]

1jwk

From Proteopedia

Revision as of 13:26, 17 July 2019

Murine Inducible Nitric Oxide Synthase Oxygenase Dimer (Delta 65) with W457A Mutation at Tetrahydrobiopterin Binding Site

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox