Which of the following amino acids can form 2 H-bonds within an alpha helix?
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- 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-ValWhich amino acids would you expect to find marked on the alpha helix? Alanine Isoleucine Leucine Methionine Phenylalanine Tryptophan Valine 000000 |||| |||||| ||||||||| 000000 Nonpolar side chains; hydrophobic Side chain (R group) H₂N H₂N C 0 H₂N HO Glycine (Gly or G) CH₂ H₂N CH₂ CH₂ OH CH₂ CH₂ Methionine (Met or M) Polar side chains; hydrophilic HO Alanine (Ala or A) CH₂ H.Nº C C-O HO Phenylalanine (Phe or F) ỖI 0-0 SH он сн CH₂ CH OH₂NCCO H₂N*CCO Acidic (negatively charged) 0 0 Serine Threonine Cysteine (Ser or S) (Thr or T) (Cys or C) Electrically charged side chains; hydrophilic CH₂ CH₂ CH₂ CH₂ CH H₂NCCO H₂NCCO H₂NCC o HO Aspartic acid Glutamic acid (Asp or D) (Glu or E) HO Valine (Val or V) 000000000 ||||| ||||| ||||||| 00000000 NH₂ OH H₂N HẲN Ô CÓ HO Tryptophan (Trp or W) CH₂ H₂N² сCO 0 CH₂ CH₂ H₂NCCO HO Lysine (Lys or K) 0 Leucine (Leu or L) NH CH₂ CH₂ CH CH₂ NH₂ H₂N® CH₂ Tyrosine (Tyr or Y) Asparagine (Asn or N) Basic (positively charged) NH₂ CNH, NH CH₂ CH₂ CH₂ H₂NCCO HO…Changing one amino acid within a protein sequence from a tryptophan to a stop codon would be best classified as Amino acids groups Group Characteristics Names Ala, Val, Leu, Ile, Pro, Phe Trp, Met Ala: A Leu: L non-polar hydrophobic Arg: R Asn: N Lys: K Met: M Asp: D Cys: C Gly: G polar hydrophilic (non-charged) Gly , Ser, Thr, Cys, Tyr, Asn Gln Phe: F Pro: P Ser: S acidic negatively charged Asp, Glu Glu: E Gln: Q Thr: T His: H lle: I Trp: W Туr: Y Val: V basic positively charged Lys, Arg, His A) Conservative missense O B) Nonsense O C) Neutral O D) Non-conservative missense
- Given the structures of the ribonucleotides and deoxyribonucleotides: Adenine Uracil Thymine HN Adenine NH HO-P-0- CH2 HO-P-0 CH2 HO-P-0-CH2 HO-P-0-CH он он он он OH H OH H Cytosine Cytosine Guanine Guanine NH2 NH NH2 CH2 HOo CH2 HO-P-0 -CH2 он он он он OH H OH H • Draw the structure of the polyribonucleotide UAGCCUG. Draw the structure of the polydeoxyribonucleotide CGTAGAT.Within a naturally-occurring polypeptide, under neutral pH conditions (pH = 7.0), which of the following amino acids always has a negatively charged carboxyl group? the first amino acid in the primary structure histidine lysine arginine the last amino acid in the primary structureDraw the structure of the following nucleotide: adenosine 3'-monophosphate or guanosine 2-monophosphate
- Which statement is true regarding an a helix, there are five residues per helical turn. the helix is right-handed there are usually many proline residues present. side chain residues point up and down the axis of the helix.In an alpha helix, the carbonyl oxygen of residue n is hydrogen bonded to the amide proton of residue n+x, where x is equal to 2 3 4The structure of an alpha helix orients the oxygens of the carbonyl group of the peptide bond towards the C-terminal end of the helix while the hydrogens of the NH groups orient toward the N-terminal end, thus imparting a dipole along the length of the helix. As a result, which kinds of amino acids would favor the C-terminal end, and which would favor the N-terminal end? negatively charged, positively charged positively charged, negatively charged negatively charged, hydrophobic positively charged, hydrophobic hydrophobic, negatively charged hydrophobic, positively charged
- Which of the following is/are least likely to be found in an alpha helix because it has an inappropriate Phi angle. a Polar charged amino acids b Proline c Nonpolar amino acids d Glycine e Polar uncharged amino acidsIt is often the case that a helices are positioned in a protein such that one side faces the interior of the protein and the other, the surface of the protein. These are said to be amphiphilic helices because they face different environments. Using a helical wheel projection (shown below), which of the peptide(s) below might form an amphiphilic helix? 8 15 1 12 4 11 16 18 9 7 14 13 10 17 O SLIKSVIEMVDEWFRTFL O FLIRVLRKVFRVLTRILS O RLFRSRVLKIAVIRFLLIWhich amino acid from the following list best fits the alpha helix? lysine alanine glycine serine