Candida tropicalis cells and use thereof

A method for production of ω-aminocarboxylic acids or ω-aminocarboxylic acid esters, comprising

• a) contacting a Candida tropicalis cell with a medium comprising a carboxylic acid or a carboxylic acid ester,
• b) cultivating the Candida tropicalis cell under conditions that enable the Candida tropicalis cell to form corresponding ω-hydroxycarboxylic acid or ω-hydroxycarboxylic acid esters from the carboxylic acid or the carboxylic acid ester,
• c) optionally isolating the ω-hydroxycarboxylic acid or ω-hydroxycarboxylic acid esters that formed, converting the ω-hydroxycarboxylic acids or corresponding esters into the ω-oxo-carboxylic acids or the corresponding esters and then aminating the oxo-group,
• wherein the Candida tropicalis cell has, compared with its wild type, a reduced activity of at least one of enzyme encoded by an intron-free nucleic acid sequences selected from the group consisting of SEQ ID NO:
• 57 and a sequence that is 95% identical to SEQ ID NO:
• 57.