Methane-To-Methanol Conversion (IMAGE) Northwestern University Caption The primary metabolic enzyme in methanotrophic bacteria, particulate methane monooxygenase (pMMO), catalyzes the methane-to-methanol conversion at a site with one copper ion. Credit Northwestern University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.