For about a decade, Professor Tuller’s laboratory at Tel Aviv University has specialized in the modeling and engineering of gene expression using biophysical simulations, computational modeling of molecular evolution, and machine learning.
Among other things, these models are used to make the production of heterologous proteins (proteins coded by genes that come from another organism) more efficient and thus cheaper. Professor Tuller’s technology has been successfully used in the past to produce vaccines, antibodies, biosensors, and green energy using various organisms such as yeast, bacteria, micro-algae, and even viruses. Professor Tuller and his colleagues are now on the way to conquering a new objective: cow’s milk.
Professor Tuller says: “The genome of every living creature contains genes that encode the recipe for making chains of amino acids that make up proteins. However, it also contains information that encodes the complicated process that is known as ‘gene expression’ — the timing and pace of the creation of the proteins. Gene expression is the process of turning information stored in “inanimate” DNA into proteins that are the ‘essence of life’ and are a major ingredient in every living thing that we know, from human beings to the coronavirus to cow’s milk.
For many years, biotechnology companies have been harnessing the gene expression process in order to produce desirable proteins affordably. They do this by taking a gene from one living organism and implanting it in the genome of another organism that will serve as a ‘factory’ for producing the protein that is encoded in that gene. This technology has been used for many years to produce medications, vaccines, and energy, and it is also used in the food industry.”
Professor Tuller adds: “Theoretically, we can reach a situation in which we can’t tell the difference between cow’s milk that comes from a cow and cow’s milk that comes from yeast. But in order for that to happen in an economical way, we must turn the yeast cells into efficient factories that produce milk proteins – not a simple challenge to solve. Even though we know what the genes that encode the proteins for cow’s milk are, those genes are written in the ‘language’ of cow cells, and need to be rewritten in the ‘language’ of yeast. This will make the production of the milk proteins possible in an appropriate, affordable, and efficient way in the yeast cell ‘factory’.
With the help of models that we developed in the laboratory, we believe that within a fairly short time, we will succeed in making yeast produce milk proteins in an efficient way that will enable affordable, high-quality industrial-scale, production.
There have already been attempts to produce milk from microflora, but the price of producing milk in this way was a far cry from being affordable. I believe that we are on the right path, and within a fairly short time, we will be able to prepare in our own homes, toast with yellow cheese that was made from yeast and not from cow’s milk, without having paid any more for it.”