Often function as enzymes or transport proteins → globular proteins
peptide chains arranged in long strands, or fibers → fibrous proteins
peptide chains highly folded into spherical shapes → globular proteins
keratins → fibrous proteins
hemoglobin → globular proteins
water-soluble → globular proteins
collagens → fibrous proteins
insoluble in water → fibrous proteins
Polypeptide chains in fibrous proteins are arranged almost parallel along a single axis, resulting in long fibres or broad sheets. These proteins frequently exhibit mechanical strength and resistance to water solubilization. In nature, fibrous proteins frequently perform a structural role.
Soluble in water solutions, globular proteins are often. The wide range of activities carried out by globular proteins, including binding, catalysis, regulation, transport, immunity, and cellular signalling, is reflected in the diversity of protein shapes.
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