posted by .

I'm asked to tell which of the following peptide segments is most likely to be part of a stable Alpha Helix at physiological pH? Only 1 can be chosen

1. gly-gly-gly-ala-gly
2. gly-arg-lys-his-gly
3. pro-leu-thr-pro-trp
4. lys-lys-ala-arg-ser
5. glu-leu-ala-lys-phe
6. glu-glu-glu-glu-glu
7. tyr-trp-phe-val-lie

  • Chemistry -


  • Chemistry -

    Tyr-Trp-Phe-Val-iLe is wrong because of the big bulky tyr,trp, and phe.

    Anything with Gly is wrong because gly is too flexible which causes it to form other helicies.

    (This is the feedback given from Sapling)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. bio chem

    5.From the amino acids below, name the amino acids you expect to find in the following regions of an enzyme and explain why. Ala, Val, Leu, Ser, Thr, Asn, Arg, Lys, Met, Pro, Gly, Phe, Cys, His a. Turn b. Interior c. Surface d. Active …
  2. organic

    a peptide contains amino acids Phe,Gly Met,Ala, and Ser. N-terminal analysis yielded the PTH derivative of alanine. Partial hydrolysis of the petapeptide yielded the dipeptides Gly-Ser, Ala-Gly, and Ser-Met. The peptide sequence is …
  3. Biochemistry

    A peptide has the sequence: Glutamate - His - Trp - Ser - Gly - Leu - Arg - Pro - Gly What is the net charge of the molecule at pH 3, 8, and 11?
  4. Biochemistry

    A peptide has the sequence: Glutamate - His - Trp - Ser - Gly - Leu - Arg - Pro - Gly What is the net charge of the molecule at pH 3, 8, and 11?
  5. Biochemistry

    Hello guys, I just wanted some clarification of these question. 1. A sequence of amino acids in a certain protein is found to be -Ser-Pro-Gly-Gly-. The sequence is most probably part of a 1. a-helix 2.b-turn (b-bend) 3. parallel b-pleated …
  6. Biology

    1) What is the minimum number of single nucleotide substitutions that would be necessary for each of the following amino acid replacements?
  7. Biochemistry (Challenging!!)

    A nonapeptide was determined to have the following amino acid composition: (Arg)2, (Gly)2, (Phe)2, His, Leu, Met. 1-fluoro-2,4-dinitrobenzene (FDNB) reacts with free amino (but not amido or guanidino) groups in proteins to produce …
  8. Chemistry

    I'm given sequences and asked to classify them as "Most likely an amphipathic alpha helix", "Most likely an amphipathic beta sheet", "Most likely a turn/loop" or "Not Amphipathic" Sequence 1: Arg-Phe-Gln-Ile-His-Val-Gln-Phe-Glu Sequence …
  9. Chemistry

    Calculate the pI (isoelectric point) of the dipeptide, Lys-Gly, assuming that there is negligible shift in the values of acid dissociation constants from the values of the constituent amino acids. Gly pkA 9.87 an pka 2.35; Lys pka …
  10. Biochemistry

    You are performing site-directed mutagenesis to test predictions about which residues are essential for a protein's function. Which of each pair of amino acid substitutions listed below would you expect to disrupt protein function …

More Similar Questions