2fbz

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[[Image:2fbz.gif|left|200px]]<br /><applet load="2fbz" size="350" color="white" frame="true" align="right" spinBox="true"
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[[Image:2fbz.gif|left|200px]]
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caption="2fbz, resolution 2.10&Aring;" />
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'''Heme-No complex in a bacterial Nitric Oxide Synthase'''<br />
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{{Structure
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|PDB= 2fbz |SIZE=350|CAPTION= <scene name='initialview01'>2fbz</scene>, resolution 2.10&Aring;
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|SITE=
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|LIGAND= <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=H2B:2-AMINO-6-(1,2-DIHYDROXY-PROPYL)-7,8-DIHYDRO-6H-PTERIDIN-4-ONE'>H2B</scene>, <scene name='pdbligand=NO:NITROGEN+OXIDE'>NO</scene> and <scene name='pdbligand=HAR:N-OMEGA-HYDROXY-L-ARGININE'>HAR</scene>
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|ACTIVITY=
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|GENE= nos ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1423 Bacillus subtilis])
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}}
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'''Heme-No complex in a bacterial Nitric Oxide Synthase'''
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==Overview==
==Overview==
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==About this Structure==
==About this Structure==
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2FBZ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with <scene name='pdbligand=HEM:'>HEM</scene>, <scene name='pdbligand=H2B:'>H2B</scene>, <scene name='pdbligand=NO:'>NO</scene> and <scene name='pdbligand=HAR:'>HAR</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FBZ OCA].
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2FBZ is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FBZ OCA].
==Reference==
==Reference==
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Nitrosyl-heme structures of Bacillus subtilis nitric oxide synthase have implications for understanding substrate oxidation., Pant K, Crane BR, Biochemistry. 2006 Feb 28;45(8):2537-44. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16489746 16489746]
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Nitrosyl-heme structures of Bacillus subtilis nitric oxide synthase have implications for understanding substrate oxidation., Pant K, Crane BR, Biochemistry. 2006 Feb 28;45(8):2537-44. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16489746 16489746]
[[Category: Bacillus subtilis]]
[[Category: Bacillus subtilis]]
[[Category: Single protein]]
[[Category: Single protein]]
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[[Category: nitric oxide synthase]]
[[Category: nitric oxide synthase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:19:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 16:50:32 2008''

Revision as of 14:50, 20 March 2008

Image:2fbz.gif


PDB ID 2fbz

Drag the structure with the mouse to rotate
, resolution 2.10Å
Ligands: , , and
Gene: nos (Bacillus subtilis)
Coordinates: save as pdb, mmCIF, xml



Heme-No complex in a bacterial Nitric Oxide Synthase


Overview

The crystal structures of nitrosyl-heme complexes of a prokaryotic nitric oxide synthase (NOS) from Bacillus subtilis (bsNOS) reveal changes in active-site hydrogen bonding in the presence of the intermediate N(omega)-hydroxy-l-arginine (NOHA) compared to the substrate l-arginine (l-Arg). Correlating with a Val-to-Ile residue substitution in the bsNOS heme pocket, the Fe(II)-NO complex with both l-Arg and NOHA is more bent than the Fe(II)-NO, l-Arg complex of mammalian eNOS [Li, H., Raman, C. S., Martasek, P., Masters, B. S. S., and Poulos, T. L. (2001) Biochemistry 40, 5399-5406]. Structures of the Fe(III)-NO complex with NOHA show a nearly linear nitrosyl group, and in one subunit, partial nitrosation of bound NOHA. In the Fe(II)-NO complexes, the protonated NOHA N(omega) atom forms a short hydrogen bond with the heme-coordinated NO nitrogen, but active-site water molecules are out of hydrogen bonding range with the distal NO oxygen. In contrast, the l-Arg guanidinium interacts more weakly and equally with both NO atoms, and an active-site water molecule hydrogen bonds to the distal NO oxygen. This difference in hydrogen bonding to the nitrosyl group by the two substrates indicates that interactions provided by NOHA may preferentially stabilize an electrophilic peroxo-heme intermediate in the second step of NOS catalysis.

About this Structure

2FBZ is a Single protein structure of sequence from Bacillus subtilis. Full crystallographic information is available from OCA.

Reference

Nitrosyl-heme structures of Bacillus subtilis nitric oxide synthase have implications for understanding substrate oxidation., Pant K, Crane BR, Biochemistry. 2006 Feb 28;45(8):2537-44. PMID:16489746

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