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3b98

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{{STRUCTURE_3b98| PDB=3b98 | SCENE= }}
{{STRUCTURE_3b98| PDB=3b98 | SCENE= }}
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'''Crystal structure of zebrafish prostacyclin synthase (cytochrome P450 8A1)'''
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===Crystal structure of zebrafish prostacyclin synthase (cytochrome P450 8A1)===
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==Overview==
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Prostacyclin synthase (PGIS) is a cytochrome P450 (P450) enzyme that catalyzes production of prostacyclin from prostaglandin H(2). PGIS is unusual in that it catalyzes an isomerization rather than a monooxygenation, which is typical of P450 enzymes. To understand the structural basis for prostacyclin biosynthesis in greater detail, we have determined the crystal structures of ligand-free, inhibitor (minoxidil)-bound and substrate analog U51605-bound PGIS. These structures demonstrate a stereo-specific substrate binding and suggest features of the enzyme that facilitate isomerization. Unlike most microsomal P450s, where large substrate-induced conformational changes take place at the distal side of the heme, conformational changes in PGIS are observed at the proximal side and in the heme itself. The conserved and extensive heme propionate-protein interactions seen in all other P450s, which are largely absent in the ligand-free PGIS, are recovered upon U51605 binding accompanied by water exclusion from the active site. In contrast, when minoxidil binds, the propionate-protein interactions are not recovered and water molecules are largely retained. These findings suggest that PGIS represents a divergent evolution of the P450 family, in which a heme barrier has evolved to ensure strict binding specificity for prostaglandin H(2), leading to a radical-mediated isomerization with high product fidelity. The U51605-bound structure also provides a view of the substrate entrance and product exit channels.
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(as it appears on PubMed at http://www.pubmed.gov), where 18032380 is the PubMed ID number.
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{{ABSTRACT_PUBMED_18032380}}
==About this Structure==
==About this Structure==
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[[Category: Isomerase]]
[[Category: Isomerase]]
[[Category: Prostacyclin synthase]]
[[Category: Prostacyclin synthase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Apr 9 14:45:19 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 18:30:18 2008''

Revision as of 15:30, 28 July 2008

Image:3b98.png

Template:STRUCTURE 3b98

Crystal structure of zebrafish prostacyclin synthase (cytochrome P450 8A1)

Template:ABSTRACT PUBMED 18032380

About this Structure

3B98 is a Single protein structure of sequence from Danio rerio. Full crystallographic information is available from OCA.

Reference

Structures of Prostacyclin Synthase and Its Complexes with Substrate Analog and Inhibitor Reveal a Ligand-specific Heme Conformation Change., Li YC, Chiang CW, Yeh HC, Hsu PY, Whitby FG, Wang LH, Chan NL, J Biol Chem. 2008 Feb 1;283(5):2917-26. Epub 2007 Nov 21. PMID:18032380

Page seeded by OCA on Mon Jul 28 18:30:18 2008

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