Reconstitution and properties of a coenzyme F420-mediated formate hydrogenlyase system in Methanobacterium formicicum

S. F. Baron, J. G. Ferry

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Formate hydrogenlyase activity in a cell extract of Methanobacterium formicicum was abolished by removal of coenzyme F420; addition of purified coenzyme F420 restored activity. Formate hydrogenlyase activity was reconstituted with three purified components from M. formicicum: coenzyme F420-reducing hydrogenase, coenzyme F420-reducing formate dehydrogenase, and coenzyme F420. The reconstituted system required added flavin adenine dinucleotide (FAD) for maximal activity. Without FAD, the formate dehydrogenase and hydrogenase rapidly lost coenzyme F420-dependent activity relative to methyl viologen-dependent activity. Immunoadsorption of formate dehydrogenase or coenzyme F420-reducing hydrogenase from the cell extract greatly reduced formate hydrogenlyase activity; addition of the purified enzymes restored activity. The formate hydrogenlyase activity was reversible, since both the cell extract and the reconstituted system produced formate from H2 plus CO2 and HCO3-.

Original languageEnglish (US)
Pages (from-to)3854-3859
Number of pages6
JournalJournal of bacteriology
Issue number7
StatePublished - 1989

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Molecular Biology

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