Biochemical and physiological characterization of the pyruvate formate-lyase Pfl1 of Chlamydomonas reinhardtii, a typically bacterial enzyme in a eukaryotic alga.

ABSTRACT: The unicellular green alga Chlamydomonas reinhardtii has a special type of anaerobic metabolism that is quite unusual for eukaryotes. It has two oxygen-sensitive [Fe-Fe] hydrogenases (EC 1.12.7.2) that are coupled to photosynthesis and, in addition, a formate- and ethanol-producing fermentative metabolism, which was proposed to be initiated by pyruvate formate-lyase (Pfl; EC 2.3.1.54). Pfl enzymes are commonly found in prokaryotes but only rarely in eukaryotes. Both the hydrogen- and the formate/ethanol-producing pathways are involved in a sustained anaerobic metabolism of the alga, which can be induced by sulfur depletion in illuminated cultures. Before now, the presence of a Pfl protein in C. reinhardtii was predicted from formate secretion and the homology of the deduced protein of the

SUBMITTER: Hemschemeier A 

PROVIDER: S-EPMC2268514 | biostudies-literature | 2008 Mar

REPOSITORIES: biostudies-literature