* Globular: These proteins are spherical or roughly spherical in shape. They are often soluble in water and perform a variety of functions, such as enzymes, antibodies, and hormones. Examples include hemoglobin, insulin, and lysozyme.
* Fibrous: These proteins are long and thin, like fibers. They are often insoluble in water and provide structural support. Examples include collagen, keratin, and elastin.
* Irregular: Some proteins don't fit neatly into the globular or fibrous categories and have complex, irregular shapes. These proteins often have multiple domains, which are distinct functional units within the protein.
It's important to remember that the shape of a protein is crucial for its function. The specific arrangement of amino acids determines the protein's three-dimensional structure, which in turn dictates how it interacts with other molecules.
