Methane monooxygenase (MMO), which exists in particulate (pMMO) or soluble forms (sMMO) in methanotrophic bacteria, is an industrially promising enzyme that catalyses oxidation of low-reactive methane and other carbon feedstocks into methanol and their corresponding oxidation products. However, the simple, fast and high-yield production of functionally active MMO, which has so far been unsuccessful despite diverse approaches based on either native methanotroph culture or recombinant expression systems, remains a major challenge for its industrial applications. Here we developed pMMO-mimetic catalytic protein constructs by genetically encoding the beneficial reassembly of catalytic domains of pMMO on apoferritin as a biosynthetic scaffold. This approach resulted in high-yield synthesis of stable and soluble protein constructs in Escherichia coli, which successfully retain enzymatic activity for methanol production with a turnover number comparable to that of native pMMO.
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© 2019, The Author(s), under exclusive licence to Springer Nature Limited.
All Science Journal Classification (ASJC) codes
- Process Chemistry and Technology