Evidence for an operative glyoxylate cycle in the thermoacidophilic crenarchaeon Sulfolobus acidocaldarius

FEBS Letters
Helge UhrigshardtStefan Anemüller

Abstract

Both key enzymes for the glyoxylate cycle, isocitrate lyase (EC 4.1.3.1) and malate synthase (EC 4.1.3.2), were purified and characterized from the thermoacidophilic crenarchaeon Sulfolobus acidocaldarius. Whereas the former enzyme was copurified with the aconitase, the latter enzyme could be enriched to apparent homogeneity. Amino acid sequencing of three internal peptides of the isocitrate lyase revealed the presence of highly conserved residues. With respect to cofactor requirement and quarternary structure the crenarchaeal malate synthase might represent a novel type of this enzyme family. High activities of both glyoxylate cycle enzymes could already be detected in extracts of glucose grown cells and both increased about two-fold in extracts of acetate grown cells.

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Citations

Aug 26, 2010·The Journal of Biological Chemistry·Charlotte E M NunnMichael J Danson
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