structure predictor

A structure predictor is a program that looks only at a sequence—a one-line blueprint—and computes ahead of time what three-dimensional shape that molecule will fold into. Think of it like looking at origami instructions and picturing in your head what the finished shape will look like. A protein is a long, thread-like chain of amino acids, and what it does depends entirely on how that thread twists and folds.

This prediction matters because if you want two molecules to bind tightly to each other, you first need to know each one's shape. Get the shape wrong, and no matter how carefully you design the sequence, the result won't actually bind in the lab. That's why, in the work of designing new proteins, a structure predictor is used together with the task of choosing a sequence.

Recently, rather than being used on its own, this kind of predictor has been evolving to also calculate the shape a target and a new protein form together when they meet. This kind of calculation—folding two structures at once—has its own name, which you can find in a related entry.