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5 Abstract Cytochrome P450 1A1 (CYP1A1) is one of the major isoforms of the cytochrome P450 superfamily. It is primarily an extrahepatic enzyme which is responsible for oxidation of many polycyclic aromatic hydrocarbons and other xenobiotics. Besides of the role in detoxification metabolism CYP1A1 is the one most important isoform involved in activation of procarcinogens. The main aim of this project was preparation of two modifications of the rat CYP1A1 gene with codon optimization for expression in E. coli by gene synthesis. One was wild type (wt1A1) and the other was with modified N-terminal anchor (mod1A1) - for both modifications with or without His Tag at the C-end of CYP1A1. Furthermore, an aim was to compare their level of expression in different strains of E. coli and try to purify and assess enzymatic activity of the gene's products. From pre-prepared oligonucleotides 2 "syntons" (parts of gene) were synthetized and separately inserted into pUC19. After verified sequence of the "syntons" they were cleaved from pUC19 and inserted together into pET-22b. These vectors were prepared for transformation of 3 strains of E. coli (BL-21 (DE3) GOLD, RIL a RIPL). For production of proteins many conditions were tested: temperature (18, 22, 24, 27 a 37 řC), time of production (untill 48 hours), concentration...