Using enzyme engineering and other capabilities, Sandia National Laboratories will work to engineer pathways from methanotroph organisms into another microbial host that can generate butanol. Butanol has long been considered one of the best biofuel options for transportation energy. (Photo by Dino Vournas)

A new project spearheaded by researchers at Sandia National Laboratories are using their expertise in protein expression, enzyme engineering and high-throughput assays to develop biocatalyst technologies that can convert natural gas to liquid fuel or methane to butanol for transportation. The $34 million project by the Advanced Research Project Agency Energy (ARPA-E) is one of a set of 15 Reducing Emissions using Methanotrophic Organisms for Transportation Energy or REMOTE, projects. Sandia is a part of a two-year award led by MOgene Green Chemicals, a wholly owned subsidiary of St. Louis-based MOgene, LC.

The broad goal of REMOTE is to have another source of energy in the U.S. that doesn’t have to be imported and could lead to lower carbon monoxide emissions than conventional fossil fuels.

Methanotrophs are microbes that can metabolize methane. Sandia’s Blake Simmons, manager of the labs’ biofuels and biomaterial science and technology group, calls this microbe the “poster child” of organisms that are capable of metabolizing and converting methane. The goal of the project is to engineer pathways from these organisms into another microbial host that can generate butanol. Butanol can be used as a fuel in an internal combustion engine and, along with ethanol, has long been considered one of the best biofuel options for transportation energy.

“The need for hydrocarbons that are nonpetroleum in origin is still growing, including applications such as aviation and diesel engines,” said Simmons. “But in its natural state, you’re not going to readily burn natural gas in those types of engines, and the same goes for some combustion engines.” Natural gas, he explained, requires a special modification to be used effectively as a liquid fuel in vehicles, much like biomass needs to be converted before it can be used as a drop-in fuel.

“With biomass, we are essentially taking something that exists in nature and converting it into a low-cost, low-carbon, domestically-sourced fuel. With this project, we’re using natural gas as the input rather than biomass,” Simmons continued. Natural gas extracted from the ground is not renewable, he pointed out, but it is playing an increasingly important role for the Department of Energy and the nation’s energy supply.

Simmons said MOgene brings a great deal of organism expertise to the table, while Sandia offers enzyme engineering and other capabilities.

Using organisms to convert natural gas into liquid transportation fuels isn’t a new objective for the research community, Simmons said. “There have been plenty of investigations into this in the past, since there are plenty of organisms in nature that thrive and survive and multiply off of natural gas metabolism. The problem, though, is that they exist in unique, tailored environments and are typically very slow at what they do.”

ARPA-E’s projects, he said, are hoping to improve upon “what nature has given us” and develop new, more efficient pathways to speed up the process and convert gaseous feedstocks at a pace and scale that is commercially viable. Currently, there are no proven biological methods for converting gaseous inputs such as natural gas into butanol.

“What we and others are doing is looking at the core metabolism of these microbes,” Simmons said. “Then, we can either engineer it to make it faster in native organisms or we can take the metabolism out of those organisms and put it in something more industrially relevant.”

Simmons acknowledges that meeting the objectives will not be a simple endeavor. “People have been trying to express this class of enzymes for a couple of decades so this definitely won’t be a slam dunk. It’s been a confounding scientific challenge for the research community, and this is a notoriously difficult class of proteins. But we have the collective experience and capabilities at Sandia to figure it out.”