Consider an amino acid sequence: D1-G2-M3-E4-C5-A5-F7-H8-R9-I10-A11-H12-T13-Y14-G15-F16-P17-E18-A19-A20-M21-C22-K23-W24-E25-A26-Q27-P28 The β-turn structure is likely found at (Write down the residue number). A possible disulfide bond is formed between the residues and . The total number of basic residues are
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Consider an amino acid sequence:
D1-G2-M3-E4-C5-A5-F7-H8-R9-I10-A11-H12-T13-Y14-G15-F16-P17-E18-A19-A20-M21-C22-K23-W24-E25-A26-Q27-P28
The β-turn structure is likely found at (Write down the residue number).
A possible disulfide bond is formed between the residues and .
The total number of basic residues are
The addition of chymotrypsin will result in blank peptide fragment(s).
The addition of trypsin will result in blank peptide fragment(s).
The addition of CNBr will result in blank peptide fragment(s).
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- Consider the following peptide sequence: Lys-Leu-Ile-Cys-Lys What is the net charge of this sequence at physiological pH? a. -2 b. +1 c. 0 d. -1 e. +2Which of the following is an example of an unacceptable missense? a. HbA is converted to Hb Hikari, where the beta chain Lysine at #61 is replaced by Asparagine. b. Hb A, is converted to Hb M (Boston) where the alpha chain Histidine at #58 is replaced by Tyrosine. c. Hb A is converted to Hb S, where the beta chain Glutamate at #6 is replaced by Valine.A peptide with the sequence isoleucine1-aspartate2-valine3-lysine4-proline5-glutamate6 is located at the surface of a protein. Which residues are likely oriented toward the interior of the protein and what is the most likely secondary structure that this peptide is in? a.) Residue numbers 2, 4, 6; alpha helix b.) Residue numbers 1, 3, 5; alpha helix c.) Residue numbers 1, 3, 5; beta sheet d.) Residue numbers 2, 4, 6; beta sheet
- 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?Which of these statements about hemoglobin is NOT true? A) it is a tetrameric globular protein b) it has a prosthetic group called heme c) it’s dominant motif is beta barrel d) its dominant motif is helix-turn-helix The reagent used to break disulfide bonds is: a) urea b) beta-mercaptoethanol c) guanidine hydrochloride d) phosphorus pentachlorideDeduce the amino acid sequence of a polypeptide from the following:1. Acid hydrolysis gives Ala2, Arg, Lys2, Met, Phe, Ser22. Carboxypeptidase gives Ala3. Trypsin digestion gives 4 peptides a) Ala, Arg b) Lys, Phe, Ser c) Lys d) Ala, Met, Ser4. CNBr treatment gives a) Ala, Arg, Lys2, homoserine, Phe, Ser b) Ala, Ser5. Thermolysin is a protease that cuts on the N-terminal side of hydrophobic amino acids (substrate preference is Leu, Ile, Phe, Trp, Tyr, Val). Thermolysin treatment of our polypeptide yields 2 peptides a) Ala, Arg, Ser b) Ala, Lys2, Met, Phe, Ser
- Classify each of the following amino acid as polar or nonpolar. If polar, indicate if the R group is neutral, acidic, it basic. Indicate if each is hydrophobic or hydrophilic. a. lysine b. arginine c. methionine d. tyrosineWhich of the following correctly describes the 3 amino acids that are most likely to undergo phosphorylation? a) Serine, threonine, tyrosine b) Cysteine, tryptophan, tyrosine c) Serine, tyrosine, cysteine d) Tyrosine, asparagine, serineChoose ALL of the charged (+1 or -1) amino acids at aqueous physiological conditions where the ph= 7.0 A) Lysine (K) B) Alanine (A) C) Asparagine (N) D) Aspartic Acid (Q) E) Proline (P) F) Histidine (H)
- Each of the following statements concerning penicillin is correct EXCEPT: a. Penicillin is a bacteriostatic drug because autolytic enzymes are not activated. b. Penicillin inhibits transpeptidases, which are required for cross-linking peptidoglycan. C. The structure of penicillin resembles that of a dipeptide of alanine, which is a component of peptidoglycan. D. An intact β-lactam ring of penicillin is required for its activity.Illustrate the pathways to synthesize the following aminoacids:a. glutamineb. serinec. arginined. glycinee. cysteineFor the amino acids listed below, what tertiary/quaternary interaction can each of the amino acids participate in? 1)Alanine 2)Asparagine 3) Aspartic Acid 4) Arginine