Cytochrome P450 4A, peroxisomal enzymes and nicotinamide cofactors in koala liver.
We have examined hepatic levels of microsomal lauric acid hydroxylase activity and cyanide-insensitive palmitoyl coenzyme A oxidative activity in koala (Phascolarctos cinereus) and tammar wallaby (Macropus eugenii) and compared our results to those determined in rat. Microsomal lauric acid hydroxylation was significantly higher in koala than in tammar wallaby or rat. However, cyanide-insensitive palmitoyl-CoA oxidation was absent in the koala. We have also determined the hepatic nicotinamide cofactors in these species. Hepatic nicotinamide-adenine dinucleotide (NAD) and the ratio of NAD/nicotinamide-adenine dinucleotide phosphate (NADP) were higher in koala than in tammar wallaby and rat liver. Reverse transcription of koala liver mRNA, followed by polymerase chain reaction using primers based on highly conserved areas in the CYP4A family led to the cloning of a partial, near full length, cDNA clone with approximately 70% nucleotide and deduced amino acid sequence identity to human CYP4A11. The CYP has been named CYP4A15.
T10 T11 T12 T13 T14 T15 T16 T17 T1 T2 T3 T4 T5 T6 T7 T8 T9
CHEMICAL CHEMICAL GENE-N GENE-Y GENE-N GENE-N GENE-Y GENE-N CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL
amino acid nicotinamide CYP CYP4A15 lauric acid hydroxylase CYP4A human CYP4A11 Cytochrome P450 4A lauric acid lauric acid nicotinamide nicotinamide-adenine dinucleotide NAD NAD nicotinamide-adenine dinucleotide phosphate NADP nucleotide