1he4: Difference between revisions

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Revision as of 12:36, 20 March 2008

File:1he4.jpg

, resolution 1.40Å

Sites:

and

Ligands:

and

Activity:

Biliverdin reductase, with EC number 1.3.1.24

Coordinates:

save as pdb, mmCIF, xml

HUMAN BILIVERDIN IX BETA REDUCTASE: NADP/FMN TERNARY COMPLEX

OverviewOverview

Biliverdin IXbeta reductase (BVR-B) catalyzes the pyridine nucleotide-dependent production of bilirubin-IXbeta, the major heme catabolite during early fetal development. BVR-B displays a preference for biliverdin isomers without propionates straddling the C10 position, in contrast to biliverdin IXalpha reductase (BVR-A), the major form of BVR in adult human liver. In addition to its tetrapyrrole clearance role in the fetus, BVR-B has flavin and ferric reductase activities in the adult. We have solved the structure of human BVR-B in complex with NADP+ at 1.15 A resolution. Human BVR-B is a monomer displaying an alpha/beta dinucleotide binding fold. The structures of ternary complexes with mesobiliverdin IValpha, biliverdin IXalpha, FMN and lumichrome show that human BVR-B has a single substrate binding site, to which substrates and inhibitors bind primarily through hydrophobic interactions, explaining its broad specificity. The reducible atom of both biliverdin and flavin substrates lies above the reactive C4 of the cofactor, an appropriate position for direct hydride transfer. BVR-B discriminates against the biliverdin IXalpha isomer through steric hindrance at the bilatriene side chain binding pockets. The structure also explains the enzyme's preference for NADP(H) and its B-face stereospecificity.

About this StructureAbout this Structure

1HE4 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

ReferenceReference

Structure of human biliverdin IXbeta reductase, an early fetal bilirubin IXbeta producing enzyme., Pereira PJ, Macedo-Ribeiro S, Parraga A, Perez-Luque R, Cunningham O, Darcy K, Mantle TJ, Coll M, Nat Struct Biol. 2001 Mar;8(3):215-20. PMID:11224564

Page seeded by OCA on Thu Mar 20 11:35:58 2008

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OCA

@@ Line 1: / Line 1: @@
-[[Image:1he4.jpg|left|200px]]<br /><applet load="1he4" size="350" color="white" frame="true" align="right" spinBox="true"
+[[Image:1he4.jpg|left|200px]]
-caption="1he4, resolution 1.40&Aring;" />
-'''HUMAN BILIVERDIN IX BETA REDUCTASE: NADP/FMN TERNARY COMPLEX'''<br />
+ {{Structure
+|PDB= 1he4 |SIZE=350|CAPTION= <scene name='initialview01'>1he4</scene>, resolution 1.40&Aring;
+|SITE= <scene name='pdbsite=AC1:Nap+Binding+Site+For+Chain+A'>AC1</scene> and <scene name='pdbsite=AC2:Fmn+Binding+Site+For+Chain+A'>AC2</scene>
+|LIGAND= <scene name='pdbligand=NAP:NADP+NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NAP</scene> and <scene name='pdbligand=FMN:FLAVIN MONONUCLEOTIDE'>FMN</scene>
+|ACTIVITY= [http://en.wikipedia.org/wiki/Biliverdin_reductase Biliverdin reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.3.1.24 1.3.1.24]
+|GENE=
+}}
+'''HUMAN BILIVERDIN IX BETA REDUCTASE: NADP/FMN TERNARY COMPLEX'''
 ==Overview==
@@ Line 7: / Line 16: @@
 ==About this Structure==
-HE4 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=NAP:'>NAP</scene> and <scene name='pdbligand=FMN:'>FMN</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Biliverdin_reductase Biliverdin reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.3.1.24 1.3.1.24] Known structural/functional Sites: <scene name='pdbsite=AC1:Nap+Binding+Site+For+Chain+A'>AC1</scene> and <scene name='pdbsite=AC2:Fmn+Binding+Site+For+Chain+A'>AC2</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HE4 OCA].
+HE4 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HE4 OCA].
 ==Reference==
-Structure of human biliverdin IXbeta reductase, an early fetal bilirubin IXbeta producing enzyme., Pereira PJ, Macedo-Ribeiro S, Parraga A, Perez-Luque R, Cunningham O, Darcy K, Mantle TJ, Coll M, Nat Struct Biol. 2001 Mar;8(3):215-20. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11224564 11224564]
+Structure of human biliverdin IXbeta reductase, an early fetal bilirubin IXbeta producing enzyme., Pereira PJ, Macedo-Ribeiro S, Parraga A, Perez-Luque R, Cunningham O, Darcy K, Mantle TJ, Coll M, Nat Struct Biol. 2001 Mar;8(3):215-20. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11224564 11224564]
 [[Category: Biliverdin reductase]]
 [[Category: Homo sapiens]]
@@ Line 33: / Line 42: @@
 [[Category: methaemoglobin reductase]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:00:20 2008''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:35:58 2008''