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Bioorg Med Chem. 2002 Mar;10(3):545-50.

Cloning, isolation and characterization of the Thermotoga maritima KDPG aldolase.

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  • 1Department of Chemistry, Duke University, Durham, NC 27708, USA.

Abstract

The Thermotoga maritima aldolase gene has been cloned into a T7 expression vector and overexpressed in Escherichia coli. The preparation yields 470 UL(-1) of enzyme at a specific activity of 9.4 U mg(-1). During retroaldol cleavage of KDPG, the enzyme shows a k(cat) that decreases with decreasing temperature. A more than offsetting decrease in K(m) yields an enzyme that is more efficient at 40 degrees C than at 70 degrees C. The substrate specificity of the enzyme was evaluated in the synthetic direction with a range of aldehyde substrates. Although the protein shows considerable structural homology to KDPG aldolases from mesophilic sources, significant differences in substrate specificity exist. A preparative scale reaction between 2-pyridine carboxaldehyde and pyruvate provided product of the same absolute configuration as mesophilic enzymes, but with diminished stereoselectivity.

PMID:
11814840
[PubMed - indexed for MEDLINE]
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