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2isv

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{{STRUCTURE_2isv| PDB=2isv | SCENE= }}
{{STRUCTURE_2isv| PDB=2isv | SCENE= }}
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'''Structure of Giardia fructose-1,6-biphosphate aldolase in complex with phosphoglycolohydroxamate'''
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===Structure of Giardia fructose-1,6-biphosphate aldolase in complex with phosphoglycolohydroxamate===
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==Overview==
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Class I and class II fructose-1,6-bisphosphate aldolases (FBPA), glycolytic pathway enzymes, exhibit no amino acid sequence homology and utilize two different catalytic mechanisms. The mammalian class I FBPA employs a Schiff base mechanism, whereas the human parasitic protozoan Giardia lamblia class II FBPA is a zinc-dependent enzyme. In this study, we have explored the potential exploitation of the Giardia FBPA as a drug target. First, synthesis of FBPA was demonstrated in Giardia trophozoites by using an antibody-based fluorescence assay. Second, inhibition of FBPA gene transcription in Giardia trophozoites suggested that the enzyme is necessary for the survival of the organism under optimal laboratory growth conditions. Third, two crystal structures of FBPA in complex with the transition state analog phosphoglycolohydroxamate (PGH) show that the enzyme is homodimeric and that its active site contains a zinc ion. In one crystal form, each subunit contains PGH, which is coordinated to the zinc ion through the hydroxamic acid hydroxyl and carbonyl oxygen atoms. The second crystal form contains PGH only in one subunit and the active site of the second subunit is unoccupied. Inspection of the two states of the enzyme revealed that it undergoes a conformational transition upon ligand binding. The enzyme cleaves d-fructose-1,6-bisphosphate but not d-tagatose-1,6-bisphosphate, which is a tight binding competitive inhibitor. The essential role of the active site residue Asp-83 in catalysis was demonstrated by amino acid replacement. Determinants of catalysis and substrate recognition, derived from comparison of the G. lamblia FBPA structure with Escherichia coli FBPA and with a closely related enzyme, E. coli tagatose-1,6-bisphosphate aldolase (TBPA), are described.
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{{ABSTRACT_PUBMED_17166851}}
==About this Structure==
==About this Structure==
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[[Category: Glycolytic pathway]]
[[Category: Glycolytic pathway]]
[[Category: X-ray structure]]
[[Category: X-ray structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 07:49:46 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:21:08 2008''

Revision as of 04:21, 29 July 2008

Image:2isv.png

Template:STRUCTURE 2isv

Structure of Giardia fructose-1,6-biphosphate aldolase in complex with phosphoglycolohydroxamate

Template:ABSTRACT PUBMED 17166851

About this Structure

2ISV is a Single protein structure of sequence from Giardia intestinalis. Full crystallographic information is available from OCA.

Reference

Characterization, kinetics, and crystal structures of fructose-1,6-bisphosphate aldolase from the human parasite, Giardia lamblia., Galkin A, Kulakova L, Melamud E, Li L, Wu C, Mariano P, Dunaway-Mariano D, Nash TE, Herzberg O, J Biol Chem. 2007 Feb 16;282(7):4859-67. Epub 2006 Dec 13. PMID:17166851

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