1qfe

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{{STRUCTURE_1qfe| PDB=1qfe | SCENE= }}
{{STRUCTURE_1qfe| PDB=1qfe | SCENE= }}
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'''THE STRUCTURE OF TYPE I 3-DEHYDROQUINATE DEHYDRATASE FROM SALMONELLA TYPHI'''
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===THE STRUCTURE OF TYPE I 3-DEHYDROQUINATE DEHYDRATASE FROM SALMONELLA TYPHI===
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==Overview==
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The structures of enzymes catalyzing the reactions in central metabolic pathways are generally well conserved as are their catalytic mechanisms. The two types of 3-dehydroquinate dehydratase (DHQase) are therefore most unusual since they are unrelated at the sequence level and they utilize completely different mechanisms to catalyze the same overall reaction. The type I enzymes catalyze a cis-dehydration of 3-dehydroquinate via a covalent imine intermediate, while the type II enzymes catalyze a trans-dehydration via an enolate intermediate. Here we report the three-dimensional structures of a representative member of each type of biosynthetic DHQase. Both enzymes function as part of the shikimate pathway, which is essential in microorganisms and plants for the biosynthesis of aromatic compounds including folate, ubiquinone and the aromatic amino acids. An explanation for the presence of two different enzymes catalyzing the same reaction is presented. The absence of the shikimate pathway in animals makes it an attractive target for antimicrobial agents. The availability of these two structures opens the way for the design of highly specific enzyme inhibitors with potential importance as selective therapeutic agents.
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(as it appears on PubMed at http://www.pubmed.gov), where 10360352 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10360352}}
==About this Structure==
==About this Structure==
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[[Category: Dehydratase]]
[[Category: Dehydratase]]
[[Category: Tim barrel]]
[[Category: Tim barrel]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:12:07 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 13:51:08 2008''

Revision as of 10:51, 27 July 2008

Image:1qfe.png

Template:STRUCTURE 1qfe

THE STRUCTURE OF TYPE I 3-DEHYDROQUINATE DEHYDRATASE FROM SALMONELLA TYPHI

Template:ABSTRACT PUBMED 10360352

About this Structure

1QFE is a Single protein structure of sequence from Salmonella typhi. Full crystallographic information is available from OCA.

Reference

The two types of 3-dehydroquinase have distinct structures but catalyze the same overall reaction., Gourley DG, Shrive AK, Polikarpov I, Krell T, Coggins JR, Hawkins AR, Isaacs NW, Sawyer L, Nat Struct Biol. 1999 Jun;6(6):521-5. PMID:10360352

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