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2og5

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[[Image:2og5.gif|left|200px]]
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{{STRUCTURE_2og5| PDB=2og5 | SCENE= }}
{{STRUCTURE_2og5| PDB=2og5 | SCENE= }}
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'''Crystal structure of asparagine oxygenase (AsnO)'''
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===Crystal structure of asparagine oxygenase (AsnO)===
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==Overview==
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Non-ribosomally synthesized lipopeptide antibiotics of the daptomycin type are known to contain unnatural beta-modified amino acids, which are essential for bioactivity. Here we present the biochemical and structural basis for the incorporation of 3-hydroxyasparagine at position 9 in the 11-residue acidic lipopeptide lactone calcium-dependent antibiotic (CDA). Direct hydroxylation of l-asparagine by AsnO, a non-heme Fe(2+)/alpha-ketoglutarate-dependent oxygenase encoded by the CDA biosynthesis gene cluster, was validated by Fmoc derivatization of the reaction product and LC/MS analysis. The 1.45, 1.92, and 1.66 A crystal structures of AsnO as apoprotein, Fe(2+) complex, and product complex, respectively, with (2S,3S)-3-hydroxyasparagine and succinate revealed the stereoselectivity and substrate specificity of AsnO. The comparison of native and product-complex structures of AsnO showed a lid-like region (residues F208-E223) that seals the active site upon substrate binding and shields it from sterically demanding peptide substrates. Accordingly, beta-hydroxylated asparagine is synthesized prior to its incorporation into the growing CDA peptide. The AsnO structure could serve as a template for engineering novel enzymes for the synthesis of beta-hydroxylated amino acids.
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{{ABSTRACT_PUBMED_17373765}}
==About this Structure==
==About this Structure==
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[[Category: Jelly-roll fold]]
[[Category: Jelly-roll fold]]
[[Category: Non-ribosomal peptide synthesis]]
[[Category: Non-ribosomal peptide synthesis]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 10:50:26 2008''
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Revision as of 21:01, 28 July 2008

Image:2og5.png

Template:STRUCTURE 2og5

Crystal structure of asparagine oxygenase (AsnO)

Template:ABSTRACT PUBMED 17373765

About this Structure

2OG5 is a Single protein structure of sequence from Streptomyces coelicolor. Full crystallographic information is available from OCA.

Reference

Mechanistic and structural basis of stereospecific Cbeta-hydroxylation in calcium-dependent antibiotic, a daptomycin-type lipopeptide., Strieker M, Kopp F, Mahlert C, Essen LO, Marahiel MA, ACS Chem Biol. 2007 Mar 20;2(3):187-96. PMID:17373765

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