The binding of specific proteins on regulatory DNA sequences can be studied by means of:

Explanation

X-ray crystallography is uniquely suited for studying the binding of proteins on regulatory DNA sequences by providing detailed structural information at the atomic level. By crystallizing the protein-DNA complex and analyzing the diffraction patterns of X-rays, scientists can determine the exact arrangement of atoms and understand the interactions involved. Other methods, like ultra centrifugation, electron microscopy, and light microscopy, do not provide the same level of detail for direct interaction studies. Ultra centrifugation focuses on separating components, electron microscopy on imaging at a high resolution without direct interaction insights, and light microscopy lacks the necessary resolution for atomic-level analysis.