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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Mutagenesis and heterologous expression in yeast of a plant Delta6-fatty acid desaturase.

Membrane-bound microsomal fatty acid desaturases are known to have three conserved histidine boxes, comprising a total of up to eight histidine residues. Recently, a number of deviations from this consensus have been reported, with the substitution of a glutamine for the first histidine residue of the third histidine box being present in the so called 'front end' desaturases. These enzymes are also characterized by the presence of a cytochrome b5 domain at the protein N-terminus. Site-directed mutagenesis has been used to probe the functional importance of a number of amino acid residues which comprise the third histidine box of a 'front end' desaturase, the borage Delta6-fatty acid desaturase. This showed that the variant glutamine in the third histidine box is essential for enzyme activity and that histidine is not able to substitute for this residue.[1]


  1. Mutagenesis and heterologous expression in yeast of a plant Delta6-fatty acid desaturase. Sayanova, O., Beaudoin, F., Libisch, B., Castel, A., Shewry, P.R., Napier, J.A. J. Exp. Bot. (2001) [Pubmed]
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