1oah: Difference between revisions

Revision as of 03:35, 3 May 2008

CYTOCHROME C NITRITE REDUCTASE FROM DESULFOVIBRIO DESULFURICANS ATCC 27774: THE RELEVANCE OF THE TWO CALCIUM SITES IN THE STRUCTURE OF THE CATALYTIC SUBUNIT (NRFA).

OverviewOverview

The gene encoding cytochrome c nitrite reductase (NrfA) from Desulfovibrio desulfuricans ATCC 27774 was sequenced and the crystal structure of the enzyme was determined to 2.3-A resolution. In comparison with homologous structures, it presents structural differences mainly located at the regions surrounding the putative substrate inlet and product outlet, and includes a well defined second calcium site with octahedral geometry, coordinated to propionates of hemes 3 and 4, and caged by a loop non-existent in the previous structures. The highly negative electrostatic potential in the environment around hemes 3 and 4 suggests that the main role of this calcium ion may not be electrostatic but structural, namely in the stabilization of the conformation of the additional loop that cages it and influences the solvent accessibility of heme 4. The NrfA active site is similar to that of peroxidases with a nearby calcium site at the heme distal side nearly in the same location as occurs in the class II and class III peroxidases. This fact suggests that the calcium ion at the distal side of the active site in the NrfA enzymes may have a similar physiological role to that reported for the peroxidases.

About this StructureAbout this Structure

1OAH is a Single protein structure of sequence from Desulfovibrio desulfuricans. Full crystallographic information is available from OCA.

ReferenceReference

Cytochrome c nitrite reductase from Desulfovibrio desulfuricans ATCC 27774. The relevance of the two calcium sites in the structure of the catalytic subunit (NrfA)., Cunha CA, Macieira S, Dias JM, Almeida G, Goncalves LL, Costa C, Lampreia J, Huber R, Moura JJ, Moura I, Romao MJ, J Biol Chem. 2003 May 9;278(19):17455-65. Epub 2003 Mar 4. PMID:12618432 Page seeded by OCA on Sat May 3 03:35:41 2008

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OCA

@@ Line 1: / Line 1: @@
 [[Image:1oah.jpg|left|200px]]
- {{Structure
+<!--
-|PDB= 1oah |SIZE=350|CAPTION= <scene name='initialview01'>1oah</scene>, resolution 2.3&Aring;
+The line below this paragraph, containing "STRUCTURE_1oah", creates the "Structure Box" on the page.
-|SITE= <scene name='pdbsite=AC1:Cl+Binding+Site+For+Chain+A'>AC1</scene>
+You may change the PDB parameter (which sets the PDB file loaded into the applet)
-|LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>
+or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Nitrite_reductase_(cytochrome;_ammonia-forming) Nitrite reductase (cytochrome; ammonia-forming)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.7.2.2 1.7.2.2] </span>
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-|GENE=
+-->
-|DOMAIN=
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-|RELATEDENTRY=
-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1oah FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1oah OCA], [http://www.ebi.ac.uk/pdbsum/1oah PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1oah RCSB]</span>
-}}
 '''CYTOCHROME C NITRITE REDUCTASE FROM DESULFOVIBRIO DESULFURICANS ATCC 27774: THE RELEVANCE OF THE TWO CALCIUM SITES IN THE STRUCTURE OF THE CATALYTIC SUBUNIT (NRFA).'''
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 Cytochrome c nitrite reductase from Desulfovibrio desulfuricans ATCC 27774. The relevance of the two calcium sites in the structure of the catalytic subunit (NrfA)., Cunha CA, Macieira S, Dias JM, Almeida G, Goncalves LL, Costa C, Lampreia J, Huber R, Moura JJ, Moura I, Romao MJ, J Biol Chem. 2003 May 9;278(19):17455-65. Epub 2003 Mar 4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12618432 12618432]
 [[Category: Desulfovibrio desulfuricans]]
-[[Category: Nitrite reductase (cytochrome; ammonia-forming)]]
 [[Category: Single protein]]
 [[Category: Almeida, G.]]
@@ Line 37: / Line 33: @@
 [[Category: Moura, J J.G.]]
 [[Category: Romao, M J.]]
-[[Category: cytochrome c]]
+[[Category: Cytochrome c]]
-[[Category: nitrite reductase]]
+[[Category: Nitrite reductase]]
-[[Category: nitrogen cycle]]
+[[Category: Nitrogen cycle]]
-[[Category: respiratory nitrite ammonification]]
+[[Category: Respiratory nitrite ammonification]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 03:35:41 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:42:18 2008''