Catastrophin, or KIF2, is a microtubal

Microtubule

Microtubules are a component of the cytoskeleton. These rope-like polymers of tubulin can grow as long as 25 micrometers and are highly dynamic. The outer diameter of microtubule is about 25 nm. Microtubules are important for maintaining cell structure, providing platforms for intracellular...

 motor protein which causes destabilization, ie. increases dynamic instability, of the microtubule plus (+) end. It is specifically a kinesin-like protein with a motor domain situated in the middle portion of its heavy chain. Contrary to probable belief, the catas- prefix is related to the cata- in catabolism

Catabolism

Catabolism is the set of metabolic pathways that break down molecules into smaller units and release energy. In catabolism, large molecules such as polysaccharides, lipids, nucleic acids and proteins are broken down into smaller units such as monosaccharides, fatty acids, nucleotides, and amino...

while the -troph- is related to the -troph- in atrophy. The -in is merely a the suffix many proteins share.