Methods and means are provided to alter lipid biosynthesis in eukaryotic organisms by targeting at least two different polypeptides involved in fatty acid or lipid metabolism towards a similar or the same subdomain of an organelle, such as the endoplasmatic reticulum (ER), through fusion of the polypeptides with a similar or the same heterologous polypeptide targeting the chimeric fusion polypeptide to the mentioned subdomain.
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