The structure of a -sheet is shown below. The sheet consists of 4 peptide strand

Question

The structure of a -sheet is shown below. The sheet consists of 4 peptide strands that are interacting via hydrogen bonds (light gray lines connecting the N and O). This drawing represents only a small portion of a long polypeptide chain that is connected by loops of amino acids that are not shown in the figure. The directionality of strand 1 is indicated, running NC terminus from the top to the bottom. The "N" in the drawing indicates and amino groups and the "O" indicates the carbonyl oxygen of the peptide strand (NOT side chains). 4. (2pts) Which of the red letters on the figure indicates a peptide bond? (a c) (b) ld) 5. (3pts) On the image of the B-sheet draw arrows that indicate the direction of strands 2-4 from N to C termini. (3pts) Use "parallel" or "antiparallel" to describe the relationship between each of the following: 6. a. strand 1 and strand 2 b. strand 2 and strand 3 c. strand 1 and strand 4

Explanation / Answer

Answer 4) The red letter a on the figure indicates a peptide bond.

Answer 6) Strand 1 and 2 are antiparallel. Strand 2 and 3 are parallel. Strand 1 and 4 are antiparallel.

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