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Crystal structure of imidazole glycerol-phosphate dehydratase: duplication of an unusual fold.

Identifieur interne : 002414 ( PubMed/Curation ); précédent : 002413; suivant : 002415

Crystal structure of imidazole glycerol-phosphate dehydratase: duplication of an unusual fold.

Auteurs : Sangita C. Sinha [États-Unis] ; Barnali N. Chaudhuri ; John W. Burgner ; Galina Yakovleva ; V Jo Davisson ; Janet L. Smith

Source :

RBID : pubmed:14724278

Descripteurs français

English descriptors

Abstract

Imidazole glycerol-phosphate dehydratase (IGPD) catalyzes the sixth step of histidine biosynthesis. The enzyme is of fundamental biochemical interest, because it catalyzes removal of a non-acidic hydrogen atom in the dehydration reaction. It is also a potential target for development of herbicides. IGPD is a metalloenzyme in which transition metals induce aggregation and are required for catalysis. Addition of 1 equivalent of Mn(2+)/subunit is shown by analytical ultracentrifugation to induce the formation of 24-mers from trimeric IGPD. Two histidine-rich motifs may participate in metal binding and aggregation. The 2.3-A crystal structure of metal-free trimeric IGPD from the fungus Filobasidiella neoformans reveals a novel fold containing an internal repeat, apparently the result of gene duplication. The 95-residue alpha/beta half-domain occurs in a few other proteins, including the GHMP kinase superfamily (galacto-homoserine-mevalonate-phosphomevalonate), but duplication to form a compact domain has not been seen elsewhere. Conserved residues cluster at two types of sites in the trimer, each site containing a conserved histidine-rich motif. A model is proposed for the intact, active 24-mer in which all highly conserved residues, including the histidine-rich motifs in both the N- and C-terminal halves of the polypeptide, cluster at a common site between trimers. This site is a candidate for the active site and also for metal binding leading to aggregation of trimers. The structure provides a basis for further studies of enzyme function and mechanism and for development of more potent and specific herbicides.

DOI: 10.1074/jbc.M312733200
PubMed: 14724278

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<nlm:affiliation>Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.</nlm:affiliation>
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<name sortKey="Chaudhuri, Barnali N" sort="Chaudhuri, Barnali N" uniqKey="Chaudhuri B" first="Barnali N" last="Chaudhuri">Barnali N. Chaudhuri</name>
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<name sortKey="Burgner, John W" sort="Burgner, John W" uniqKey="Burgner J" first="John W" last="Burgner">John W. Burgner</name>
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<name sortKey="Yakovleva, Galina" sort="Yakovleva, Galina" uniqKey="Yakovleva G" first="Galina" last="Yakovleva">Galina Yakovleva</name>
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<name sortKey="Davisson, V Jo" sort="Davisson, V Jo" uniqKey="Davisson V" first="V Jo" last="Davisson">V Jo Davisson</name>
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<term>Amino Acid Sequence</term>
<term>Basidiomycota (metabolism)</term>
<term>Binding Sites</term>
<term>Catalysis</term>
<term>Crystallography, X-Ray</term>
<term>Dimerization</term>
<term>Histidine (chemistry)</term>
<term>Hydro-Lyases (chemistry)</term>
<term>Hydrogen (chemistry)</term>
<term>Magnesium (chemistry)</term>
<term>Models, Molecular</term>
<term>Molecular Sequence Data</term>
<term>Multigene Family</term>
<term>Peptides (chemistry)</term>
<term>Protein Conformation</term>
<term>Protein Folding</term>
<term>Protein Structure, Quaternary</term>
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<term>Protein Structure, Tertiary</term>
<term>Sequence Homology, Amino Acid</term>
<term>Ultracentrifugation</term>
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<term>Basidiomycota (métabolisme)</term>
<term>Catalyse</term>
<term>Conformation des protéines</term>
<term>Cristallographie aux rayons X</term>
<term>Dimérisation</term>
<term>Données de séquences moléculaires</term>
<term>Famille multigénique</term>
<term>Histidine ()</term>
<term>Hydro-lyases ()</term>
<term>Hydrogène ()</term>
<term>Magnésium ()</term>
<term>Modèles moléculaires</term>
<term>Motifs d'acides aminés</term>
<term>Peptides ()</term>
<term>Pliage des protéines</term>
<term>Similitude de séquences d'acides aminés</term>
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<term>Structure secondaire des protéines</term>
<term>Structure tertiaire des protéines</term>
<term>Séquence d'acides aminés</term>
<term>Ultracentrifugation</term>
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<term>Hydro-Lyases</term>
<term>Hydrogen</term>
<term>Magnesium</term>
<term>Peptides</term>
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<term>Amino Acid Motifs</term>
<term>Amino Acid Sequence</term>
<term>Binding Sites</term>
<term>Catalysis</term>
<term>Crystallography, X-Ray</term>
<term>Dimerization</term>
<term>Models, Molecular</term>
<term>Molecular Sequence Data</term>
<term>Multigene Family</term>
<term>Protein Conformation</term>
<term>Protein Folding</term>
<term>Protein Structure, Quaternary</term>
<term>Protein Structure, Secondary</term>
<term>Protein Structure, Tertiary</term>
<term>Sequence Homology, Amino Acid</term>
<term>Ultracentrifugation</term>
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<term>Dimérisation</term>
<term>Données de séquences moléculaires</term>
<term>Famille multigénique</term>
<term>Histidine</term>
<term>Hydro-lyases</term>
<term>Hydrogène</term>
<term>Magnésium</term>
<term>Modèles moléculaires</term>
<term>Motifs d'acides aminés</term>
<term>Peptides</term>
<term>Pliage des protéines</term>
<term>Similitude de séquences d'acides aminés</term>
<term>Sites de fixation</term>
<term>Structure quaternaire des protéines</term>
<term>Structure secondaire des protéines</term>
<term>Structure tertiaire des protéines</term>
<term>Séquence d'acides aminés</term>
<term>Ultracentrifugation</term>
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<front>
<div type="abstract" xml:lang="en">Imidazole glycerol-phosphate dehydratase (IGPD) catalyzes the sixth step of histidine biosynthesis. The enzyme is of fundamental biochemical interest, because it catalyzes removal of a non-acidic hydrogen atom in the dehydration reaction. It is also a potential target for development of herbicides. IGPD is a metalloenzyme in which transition metals induce aggregation and are required for catalysis. Addition of 1 equivalent of Mn(2+)/subunit is shown by analytical ultracentrifugation to induce the formation of 24-mers from trimeric IGPD. Two histidine-rich motifs may participate in metal binding and aggregation. The 2.3-A crystal structure of metal-free trimeric IGPD from the fungus Filobasidiella neoformans reveals a novel fold containing an internal repeat, apparently the result of gene duplication. The 95-residue alpha/beta half-domain occurs in a few other proteins, including the GHMP kinase superfamily (galacto-homoserine-mevalonate-phosphomevalonate), but duplication to form a compact domain has not been seen elsewhere. Conserved residues cluster at two types of sites in the trimer, each site containing a conserved histidine-rich motif. A model is proposed for the intact, active 24-mer in which all highly conserved residues, including the histidine-rich motifs in both the N- and C-terminal halves of the polypeptide, cluster at a common site between trimers. This site is a candidate for the active site and also for metal binding leading to aggregation of trimers. The structure provides a basis for further studies of enzyme function and mechanism and for development of more potent and specific herbicides.</div>
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<AbstractText>Imidazole glycerol-phosphate dehydratase (IGPD) catalyzes the sixth step of histidine biosynthesis. The enzyme is of fundamental biochemical interest, because it catalyzes removal of a non-acidic hydrogen atom in the dehydration reaction. It is also a potential target for development of herbicides. IGPD is a metalloenzyme in which transition metals induce aggregation and are required for catalysis. Addition of 1 equivalent of Mn(2+)/subunit is shown by analytical ultracentrifugation to induce the formation of 24-mers from trimeric IGPD. Two histidine-rich motifs may participate in metal binding and aggregation. The 2.3-A crystal structure of metal-free trimeric IGPD from the fungus Filobasidiella neoformans reveals a novel fold containing an internal repeat, apparently the result of gene duplication. The 95-residue alpha/beta half-domain occurs in a few other proteins, including the GHMP kinase superfamily (galacto-homoserine-mevalonate-phosphomevalonate), but duplication to form a compact domain has not been seen elsewhere. Conserved residues cluster at two types of sites in the trimer, each site containing a conserved histidine-rich motif. A model is proposed for the intact, active 24-mer in which all highly conserved residues, including the histidine-rich motifs in both the N- and C-terminal halves of the polypeptide, cluster at a common site between trimers. This site is a candidate for the active site and also for metal binding leading to aggregation of trimers. The structure provides a basis for further studies of enzyme function and mechanism and for development of more potent and specific herbicides.</AbstractText>
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