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1sk7

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{{STRUCTURE_1sk7| PDB=1sk7 | SCENE= }}
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'''Structural Basis for Novel Delta-Regioselective Heme Oxygenation in the Opportunistic Pathogen Pseudomonas aeruginosa'''
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===Structural Basis for Novel Delta-Regioselective Heme Oxygenation in the Opportunistic Pathogen Pseudomonas aeruginosa===
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==Overview==
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The Gram-negative bacterium Pseudomonas aeruginosa contains a heme oxygenase (pa-HO) that primarily oxygenates the delta-meso heme carbon [Caignan, G. A., Deshmukh, R., Wilks, A., Zeng, Y., Huang, H. W., Moenne-Loccoz, P., Bunce, R. A., Eastman, M. A., and Rivera, M. (2002) J. Am. Chem. Soc. 124, 14879-14892]. This differs from other previously characterized heme oxygenases, which display regioselectivity for the alpha-meso heme carbon. Here we report the crystal structure of pa-HO at 1.60 A resolution and compare it to the 1.50 A structure of nm-HO from Neisseria meningitidis [Schuller, D. J., Zhu, W., Stojiljkovic, I., Wilks, A., and Poulos, T. L. (2001) Biochemistry 40, 11552-11558]. The crystal structure of pa-HO maintains the same overall fold as other bacterial and mammalian heme oxygenases, including a conserved network of hydrogen-bonded solvent molecules important for dioxygen activation. The novel delta-regioselectivity of heme oxygenation observed by pa-HO is due to the heme being rotated by approximately 100 degrees, which places the delta-meso heme carbon in the same position as the alpha-meso heme carbon in other heme oxygenases. The main interaction in pa-HO that stabilizes the unique heme orientation is a salt bridge between Lys132 and the heme 7-propionate, as well as hydrophobic contacts involving Leu29, Val33, and Phe189 with the heme methyl and vinyl groups.
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==About this Structure==
==About this Structure==
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[[Category: Heme oxygenase]]
[[Category: Heme oxygenase]]
[[Category: Regioselectivity]]
[[Category: Regioselectivity]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 13:10:13 2008''

Revision as of 10:10, 27 July 2008

Image:1sk7.png

Template:STRUCTURE 1sk7

Structural Basis for Novel Delta-Regioselective Heme Oxygenation in the Opportunistic Pathogen Pseudomonas aeruginosa

Template:ABSTRACT PUBMED 15122889

About this Structure

1SK7 is a Single protein structure of sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA.

Reference

Structural basis for novel delta-regioselective heme oxygenation in the opportunistic pathogen Pseudomonas aeruginosa., Friedman J, Lad L, Li H, Wilks A, Poulos TL, Biochemistry. 2004 May 11;43(18):5239-45. PMID:15122889

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