protein domain

A protein domain is a distinct part of a protein's structure that can fold independently and perform a specific function. Think of it as a building block or module within a larger protein. Each domain can have a unique role, such as binding to other molecules or catalyzing chemical reactions. Proteins often consist of multiple domains, allowing them to have complex functions. By understanding these domains, scientists can better grasp how proteins work in biological processes and how they relate to health and disease.