A homopolymer of histidine (polyhistidine) adopts an alpha helix structure at pH 9 but is unfolded at a pH of 4. Explain why using chemical details
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unfolded at a pH of 4. Explain why using chemical details
Amino acids combine together to form proteins and thus are the basic blocks that build up the body. All the amino acids are essential for body growth. Alanine, arginine, glycine & Histidine are some examples of amino acids.
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- List the pyrimidine bases, the purine bases, and the base-pairing rules for DNA.Describe the steric interactions that determine the conformations that pyrimidine nucleosides assume.Poly- L -leucine in an organic solvent such as dioxane is α helical, whereas poly- L -isoleucine is not. Why do these amino acids with the same number and kinds of atoms have different helix-forming tendencies?
- Why does enzyme x catalyze the formation of the phosphodiester bond and please explain how nucleas recognizes phospjodiester bondsPolyglycine, a simple polypeptide, can form a helix with φ = -80°, ψ = +150°. From the Ramachandran plot (as shown), describe this helix with respect to handedness.Would a homopolymer of alanine be more likely to form an α helix in water or in a hydrophobic medium? Explain.
- In the following polypeptide, which amino acid would be participating in hydrogen bonding with alanine, given this sequence forms an alpha helix? Please write out the full amino acid name, not the abbreviation. Met-Ala-Leu-Glu-Lys-Thr-Leu-ValDespite being hydrophobic, why is methionine (Met) not located within a protein?In pyrimidine nucleosides the anti conformation predominates because of steric interactions with pentose. Do thepurine nucleosides have similar interactions?
- In a gel electropherosis, Glutamate and valine created a double bond. How is that possible?The purine and pyrimidine rings are built from the amino acids aspartate,glutamine, and glycine. Why is serine required for the synthesis of deoxyribonucleotides?Proline is known as a beta sheet and alpha helix "breaker ," therefore proline is rarely found in beta sheets or alpha helices. why do you think this is? In your explanation, you should describe the specific molecular interactions necessary for the formation of alpha-helices and beta-sheets. Please be as specific as possible.