BIO3050 Cell & Molecular Biology Protein Homework (20pts) Name : (2pt) You are t

Question

BIO3050 Cell & Molecular Biology Protein Homework (20pts) Name : (2pt) You are trying to determine the structure of your favorite polypeptide. You think that the portion of the polypeptide shown below will form an -helix. which of the following interactions would promote formation of this secondary structure? 1. SLIKSVIEMVDEWFRTFL a. a hydrogen bond between the amino and carboxyl terminal ends of the L at the b. a hydrogen bond between the amino and carboxyl terminal ends of the S at the c. a hydrogen bond between the side chain of the S at the first position and S at the d. a hydrogen bond between the side chain of the L at the second position and the second position and the V at the sixth position first position and the L at the second position fifth position V at the sixth position

Explanation / Answer

Ans: secondary structure is a regular pattern of hydrogen bonds between the NH and the CO components of the amino acids in the polypeptide chain, a helix and b sheets

-formed by hydrogen bonds between the peptide NH and CO groups of amino acids that are often near one another in the linear sequence

-composed of two or more polypeptide chains called B strands
-foremd by linking tow or more B strands lying next to one another through hydrogen bonds
-adjacent chians in a B sheet can run in opposite directions (anti-parallel) or in the same direction (parallel)
-a 4 or 5 strands come together
-can consist of sections of a polypeptide that are not near one another (unlike a-helix)- two b strands that lie next to each other, the last amino acid of one strand and the first amino acid of the adjacent strand are not necessarily neighbors in the amino acid sequence
-broad arrows point in the direction of the carboxyl terminal end to indicate the type of B sheet formed- parallel or anti parallel

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