CYP175A1 fromThermus thermophilusis a thermophilic cytochrome P450 and has great potential for industrial applications. However, a native elec-tron transport system for CYP175A1 has not been identified. Here, an elec-tron transport system for CYP175A1 was isolated from T. thermophilus HB27 by multistep chromatography, and identified as comprising ferre-doxin (Fdx; locus in the genome, TTC1809) and ferredoxin–NAD(P) + reductase (FNR; locus in the genome, TTC0096) by N-terminal amino acid sequence analysis and MALDI-TOF-MS, respectively. .
