Acetyl transferases and their use for producing carotenoids
The present invention relates to novel acetyl transferases, nucleic acid sequences coding therefore, expression constructs and vectors comprising these sequences, microorganisms transformed therewith and use thereof.
1. A carotenoid-producing oleaginous fungus or bacterium which has been transformed with and expresses at least one heterologous enzyme having acetyl transferase activity, wherein said enzyme is capable of converting at least one carotenoid selected from the group consisting of zeaxanthin, astaxanthin, lutein, and beta-cryptoxanthin containing at least one ring-associated hydroxyl-group into the corresponding partially or fully acetylated carotenoid molecule in said carotenoid-producing oleaginous fungus or bacterium, said enzyme comprising the amino acid sequence of SEQ ID NO:6.
2. The oleaginous fungus or bacterium of claim 1 whose carotenoid metabolism is different from the corresponding oleaginous fungus or bacterium without expressing the heterologous enzyme.
3. The oleaginous fungus or bacterium of claim 1 , which is a strain of Yarrowia lipolytica.
4. The oleaginous fungus or bacterium of claim 1 , wherein said oleaginous fungus or bacterium is a bacterium.
5. The oleaginous fungus or bacterium of claim 4 , wherein said bacterial strain is a strain of Paracoccus zeaxanthinifaciens.