2VWS image
Entry Detail
PDB ID:
2VWS
Keywords:
Title:
Crystal structure of YfaU, a metal ion dependent class II aldolase from Escherichia coli K12
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2008-06-26
Release Date:
2008-09-09
Method Details:
Experimental Method:
Resolution:
1.39 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:YFAU, 2-KETO-3-DEOXY SUGAR ALDOLASE
Chain IDs:A, B, C
Chain Length:267
Number of Molecules:3
Biological Source:ESCHERICHIA COLI
Primary Citation
Crystal Structure and Functional Assignment of Yfau, a Metal Ion Dependent Class II Aldolase from Escherichia Coli K12.
Biochemistry 47 9955 ? (2008)
PMID: 18754683 DOI: 10.1021/BI800943G

Abstact

One of the major challenges in the postgenomic era is the functional assignment of proteins using sequence- and structure-based predictive methods coupled with experimental validation. We have used these approaches to investigate the structure and function of the Escherichia coli K-12 protein YfaU, annotated as a putative 4-hydroxy-2-ketoheptane-1,7-dioate aldolase (HpcH) in the sequence databases. HpcH is the final enzyme in the degradation pathway of the aromatic compound homoprotocatechuate. We have determined the crystal structure of apo-YfaU and the Mg (2+)-pyruvate product complex. Despite greater sequence and structural similarity to HpcH, genomic context suggests YfaU is instead a 2-keto-3-deoxy sugar aldolase like the homologous 2-dehydro-3-deoxygalactarate aldolase (DDGA). Enzyme kinetic measurements show activity with the probable physiological substrate 2-keto-3-deoxy- l-rhamnonate, supporting the functional assignment, as well as the structurally similar 2-keto-3-deoxy- l-mannonate and 2-keto-3-deoxy- l-lyxonate (see accompanying paper: Rakus, J. F., Fedorov, A. A., Fedorov, E. V., Glasner, M. E., Hubbard, B. K., Delli, J. D., Babbitt, P. C., Almo, S. C., and Gerlt, J. A. (2008) Biochemistry 47, 9944-9954). YfaU has similar activity toward the HpcH substrate 4-hydroxy-2-ketoheptane-1,7-dioate and synthetic substrates 4-hydroxy-2-ketopentanoic acid and 4-hydroxy-2-ketohexanoic acid. This indicates a relaxed substrate specificity that complicates the functional assignment of members of this enzyme superfamily. Crystal structures suggest these enzymes use an Asp-His intersubunit dyad to activate a metal-bound water or hydroxide for proton transfer during catalysis.

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