Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10820479 | Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology | 2005 | 8 Pages |
Abstract
Euglena gracilis induced glyoxylate cycle enzymes when ethanol was fed as a sole carbon source. We purified, cloned and characterized a bifunctional glyoxylate cycle enzyme from E. gracilis (EgGCE). This enzyme consists of an N-terminal malate synthase (MS) domain fused to a C-terminal isocitrate lyase (ICL) domain in a single polypeptide chain. This domain order is inverted compared to the bifunctional glyoxylate cycle enzyme in Caenorhabditis elegans, an N-terminal ICL domain fused to a C-terminal MS domain. Purified EgGCE catalyzed the sequential ICL and MS reactions. ICL activity of purified EgGCE increased in the existence of acetyl-CoA at a concentration of micro-molar order. We discussed the physiological roles of the bifunctional glyoxylate cycle enzyme in these organisms as well as its molecular evolution.
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Authors
Masami Nakazawa, Tomomi Minami, Koji Teramura, Shohei Kumamoto, Sayaka Hanato, Shigeo Takenaka, Mitsuhiro Ueda, Hiroshi Inui, Yoshihisa Nakano, Kazutaka Miyatake,