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Suppose, the following is a diagram of a protein's polypeptide chain:

enter image description here

What does this diagram represent?

  1. What are the letters A, E, M, W, L, N, S, etc. represent? (I suppose these are amino acid codes. Right?)
  2. Which one is the c-alpha atom here?
  3. What are the sequence numbers i-2, i-1, i, i+1, i+2, etc. represent? Why there are negative and positive increments from i?

The following is a related diagram:

enter image description here

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  1. Yes, those are 1-letter amino acid codes
  2. The image just shows each amino acid as a single point, so it doesn't the individual atoms, including the C−α.
  3. This may require knowing where this figure came from to be more specific, but they seem to be interested in the distance between amino acids before and after some particular point in the chain.
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  • $\begingroup$ i don't know the exact source. all I know is that it's from a book. $\endgroup$
    – user366312
    Aug 23 '21 at 16:09

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