In terms of secondary structures, where is the amino acid at position 368 (TYR) located?
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Q: Where is the amino acid located at position 368 (TYR) in relation to secondary structures?
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In terms of secondary structures, where is the amino acid at position 368 (TYR) located?
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- Where is the amino acid located at position 368 (TYR) in relation to secondary structures?How is the peptide shown named (give each 3-letter name for the amino acids present)? Whichamino acid is at the N-terminal? Which amino acid is at the C-terminal?Since among the 64 codons of mRNA 61 codify amino acids that form polypeptide chains what are the functions of the three remaining codons?
- I have four amino acids: serine, histidine, alanine, and tyrosine. How many different primary structures are possible if every amino acid is used only once and tyrosine must be at the N-terminus?Consider a short peptide that forms an alpha-helix within a larger protein structure. Suppose that one glutamate residue at some specific position in the helix were mutated to a leucine residue. The mutation could either make the helix more stable, or less stable. i) Describe two situations in which a Glu-to-Leu mutation could make the helix more stable. ii) Describe two situations in which the Glu-to-Leu mutation could make the helix less stable. Explain briefly the basis for the stabilizing and destabilizing effect in all cases.Amino acids project from each polypeptide backbone in a β-sheet in an alternating fashion (oneabove the plane and the next below the plane – see Fig 3.8B). Consider the following proteinsequence: Leu-Lys-Val-Asp-Ile-Ser-Leu-Arg-Leu-Lys-Ile-Arg-Phe-Glu.a. Is there a pattern to these amino acids? If so, what is it? b. What does this sequence of amino acids mean for the hydrophobicity/hydrophilicity of theresulting β-sheet? c. Can you make a prediction about how the β-sheet will be arranged in higher levels of protein structure? If so, what prediction would you make?
- How would a substitution mutation in the third nucleotide position of the codons for alanine and valine affect the resulting protein?Assume that the number of different types of bases in RNA is four. What would be the minimum codon size (number of nucleotides) required to specify all amino acids if the number of different types of amino acids in proteins were (a) 2, (b) 8, (c) 17, (d) 45, (e) 75?Compare the codons with a pyrimidine, either U or C, as the second base. Do the majority of the amino acids specified by these codons have hydrophobic or hydrophilic side chains?
- According to wobble rules, what codons should be recognized by the follow- ing anticodons? What amino acid residues do these correspond to? (а) 5' —1CC—3' (b) 5'-GCU-3'Isoleucine is encoded by three codons (5')AUU, (5')AUC, and (5')AUA. These three codons are recognized by a single tRNAle molecule. Based on the wobble hypothesis, the anticodon sequence in tRNAle must be O (5')AUI O (5')UAG O (5')IAU O (5')UAI O (5')GAUIf an Arg residue in a protein was replaced with either Lys or Glu amino acid, whichsubstitution would you expect to result in the greatest structural change and why?