https://www.nytimes.com/2021/04/05/h...n-vaccine.htmlBut once Dr. McLellan and his colleagues handed off the 2P e to vaccine makers, he turned back to the protein for a closer look. If swapping just two prolines improved a vaccine, surely additional tweaks could improve it even more.
“It made sense to try to have a better vaccine,” said Dr. McLellan, who is now an associate professor at the University of Texas at Austin.
In March, he joined forces with two fellow University of Texas biologists, Ilya Finkelstein and Jennifer Maynard. Their three labs created 100 new es, each with an altered building block. With funding from the Gates Foundation, they tested each one and then combined the promising changes in new es. Eventually, they created a single protein that met their aspirations.
The winner contained the two prolines in the 2P e, plus four additional prolines found elsewhere in the protein. Dr. McLellan called the new e HexaPro, in honor of its total of six prolines.
The structure of HexaPro was even more stable than 2P, the team found. It was also resilient, better able to withstand heat and damaging chemicals. Dr. McLellan hoped that its rugged design would make it potent in a vaccine.