Question
Draw a diagram of a bZIP protein interacting with its DNA-binding site.
Step 1
A bZIP (Basic Leucine Zipper) protein has two main structural features: a basic region and a leucine zipper region. The basic region is involved in DNA binding, while the leucine zipper facilitates dimerization of the protein. Show more…
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In the image below, you see a section of DNA interacting with a DNA-binding protein. A portion of the DNA-binding protein forms a leucine zipper structure and, as the name implies, relies on the amino acid leucine for its proper structure. N = N-terminus and C = C-terminus. Describe the DNA-binding protein structure, making sure to reference any primary, secondary, tertiary, or quaternary levels you are seeing. In the leucine zipper structure, describe where you are more likely to find leucine. Explain your reasoning. Hint: Think about the name. Propose one amino acid substitution that would disrupt the leucine zipper structure and explain why.
Figure 1.1: The experimentally determined 3D structure of the protein TATA-Binding Protein (colored in blue) bound to DNA (backbone colored in grey and bases in turquoise). The structure was determined by X-ray crystallography.
Draw a picture of a G-C base pair. Mark the atoms of the bases that can participate in hydrogen bonds with a DNA binding protein in the major groove or the minor groove of the DNA.
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