Expression of individual copies of Methylococcus capsulatus bath particulate methane monooxygenase genes

The expression of the two gene clusters encoding the particulate methane mo nooxygenase (pMMO) in Methylococcus capsulatus Bath was assessed by analysi s of transcripts and by use of chromosomal gene fusions. The results sugges t that the two clusters are functionally redundant but that relative expres sion alters depending on the copper levels available for growth.