10 a. What is the Protein Data Bank (PDB), and how is it used to access 3D protein structure data? 

Answer: The Protein Data Bank (PDB) is a repository of 3D structures of proteins, nucleic acids, and 
other biomolecules. The data in the PDB is essential for understanding the molecular structure and function 
of proteins, enzymes, and other biological macromolecules. In bioinformatics, PDB is used for: 

● Studying protein structure: Researchers access 3D structures to understand how a protein 
functions, interacts with other molecules, and folds into its active shape. 

● Drug design: Structural data from the PDB is used to design drugs that can bind to specific 
proteins, such as enzymes or receptors, by targeting their active sites. 

● Structural bioinformatics: PDB files provide valuable information for predicting the 3D 
structure of proteins based on their sequence.