Answer
Protein folding (and misfolding) is the activity involved in producing more prion particles.
Prions spread by causing correctly folded proteins around them to adopt the same misfolded shape.
Work Step by Step
Proteins naturally fold into specific shapes. But prions are misfolded versions of a normal protein found in the brain.
Even though they have no DNA or RNA, prions can reproduce by a template mechanism:
A prion (misfolded protein) contacts a normal protein.
It forces the normal protein to change its shape into the misfolded prion shape.
Now both are prions.
This repeats, causing an exponential increase in prion particles.
A prion acts like a “template” that forces normal proteins to copy its misfolded shape.
Here’s what happens step by step:
Step 1 — A prion contacts a normal PrPᶜ protein.
The misfolded prion touches a normal version of the same protein.
Step 2 — The prion “teaches” the normal protein to misfold.
The abnormal shape causes the normal protein to change shape and become abnormal too.
This is possible because proteins are flexible:
They can bend and twist, and sometimes be pushed into a different shape.
Step 3 — Now you have two prions.
Each new prion can convert more normal proteins.
Step 4 — Chain reaction.
The more prions there are, the faster they convert additional proteins.
This creates an exponential increase in prion particles — almost like biological replication, but without genes.
