1e4a: Difference between revisions

Revision as of 00:07, 1 July 2008

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File:1e4a.png

Template:STRUCTURE 1e4a

L-FUCULOSE 1-PHOSPHATE ALDOLASE FROM ESCHERICHIA COLI MUTANT DEL(27)L-FUCULOSE 1-PHOSPHATE ALDOLASE FROM ESCHERICHIA COLI MUTANT DEL(27)

Template:ABSTRACT PUBMED 11054289

About this StructureAbout this Structure

1E4A is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

ReferenceReference

Structures of l-fuculose-1-phosphate aldolase mutants outlining motions during catalysis., Joerger AC, Mueller-Dieckmann C, Schulz GE, J Mol Biol. 2000 Nov 3;303(4):531-43. PMID:11054289

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OCA

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 {{STRUCTURE_1e4a|  PDB=1e4a  |  SCENE=  }}
-'''L-FUCULOSE 1-PHOSPHATE ALDOLASE FROM ESCHERICHIA COLI MUTANT DEL(27)'''
+===L-FUCULOSE 1-PHOSPHATE ALDOLASE FROM ESCHERICHIA COLI MUTANT DEL(27)===
-==Overview==
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-The crystal structures of l-fuculose-1-phosphate aldolase (FucA) with and without a ligated analogue of dihydroxyacetone phosphate (DHAP) and of a number of active center mutants have resulted in a model of the catalytic mechanism. This model has now been confirmed by structural analyses of further mutations at the zinc coordination sphere and at the phosphate site. In addition, these mutants have revealed new aspects of the catalysis: the hydroxyl group of Tyr113' (from a neighboring subunit), which sits just outside the zinc coordination sphere, steers DHAP towards a productive binding mode at the zinc ion; Glu73 contacts zinc in between the two ligand positions intended for the DHAP oxygen atoms and thus avoids blocking of these positions by a tetrahedrally coordinated hydroxy ion; the FucA polypeptide does not assume its minimum energy state but oscillates between two states of elevated energy as demonstrated by a mutant in a minimum energy state. The back and forth motion involves a mobile loop connecting the phosphate site with intersubunit motions and thus with the Brownian motion of the solvent. The phosphate group is bound strongly at a given distance to the zinc ion, which prevents the formation of too tight a DHAP:zinc complex. This observation explains our failure to find mutants that accept phosphate-free substitutes for DHAP. The FucA zinc coordination sphere is compared with that of carbonic anhydrase.
+The line below this paragraph, {{ABSTRACT_PUBMED_11054289}}, adds the Publication Abstract to the page
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+{{ABSTRACT_PUBMED_11054289}}
 ==About this Structure==
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 [[Category: Cleavage of l-fuculose 1-phosphate to dihydroxyacetone phosphate and l-lactaldehyde]]
 [[Category: Mutant structure]]
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