Final answer:
The protein Dynein is mutated in a syndrome that causes ciliary immotility, as dynein is a motor protein essential for the movement of cilia and flagella.
Step-by-step explanation:
The protein mutated in a disease syndrome that causes ciliary immotility is Dynein. Dynein is a motor protein involved in the movement of cilia and flagella. In the structure known as axonemes, which is part of cilia and flagella, dynein arms attached to the microtubules play a crucial role.
These arms walk along the adjacent microtubules, and this movement is necessary for the bending and proper function of cilia and flagella. When mutations occur in dynein, this action is disrupted, leading to immotile cilia syndrome, which is characterized by an inability of the cilia to move properly.