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Background  The eukaryotic green alga,  Chlamydomonas reinhardtii , produces H 2  under anaerobic conditions, in a reaction catalysed by a [Fe-Fe] hydrogenase HydA1. For further biochemical and biophysical studies a suitable expression system of this enzyme should be found to overcome its weak expression in the host organism. Two heterologous expression systems used up to now have several advantages. However they are not free from some drawbacks. In this work we use bacterium  Shewanella oneidensis  as a new and efficient system for expression and maturation of HydA1 from  Chlamydomonas reinhardtii .    Results  Based on codon usage bias and hydrogenase maturation ability, the bacterium  S. oneidensis , which possesses putative [Fe-Fe] and [Ni-Fe] hydrogenase operons, was selected as the best potential host for  C. reinhardtii  [Fe-Fe] hydrogenase expression. Hydrogen formation by  S. oneidensis  strain AS52 (Δ hydA Δ hyaB ) transformed with a plasmid bearing  Cr HydA1 and grown in the presence of six different substrates for anaerobic respiration was determined. A significant increase in hydrogen evolution was observed for cells grown in the presence of trimethylamine oxide, dimethylsulfoxide and disodium thiosulfate, showing that the system of  S. oneidensis  is efficient for heterologous expression of algal [Fe-Fe] hydrogenase.    Conclusion  In the present work a new efficient system for heterologous expression and maturation of  C. reinhardtii  hydrogenase has been developed. HydA1 of  C. reinhardtii  was purified and shown to contain 6 Fe atoms/molecule of protein, as expected. Using DMSO, TMAO or thiosulfate as substrates for anaerobic respiration during the cell growth, 0.4 – 0.5 mg l -1 (OD 600  = 1) of catalytically active HydA1 was obtained with hydrogen evolution rate of ~700 μmol H 2  mg -1  min -1 .

Shewanella oneidensis: a new and efficient System for Expression and Maturation of heterologous [Fe-Fe] Hydrogenase from Chlamydomonas reinhardtii