Proteins compute!

"Theoretical physicists in the UK have shown that it should be possible to use clusters of proteins to perform complex logic operations."

It always seemed logical (no pun) that nature's building blocks could perform computations. Now, physicists have shown that proteins may actually be able to perform rudimentary logic operations. If that's true, then of course we may then be able to say that the proteins are a universal computer. It's a stretch now, but why wouldn't nature evolve to that? Seems logical.