Reference no: EM132440050

Problem 1: A tripeptide HPK structure has been solved: the HPK side chains are not involved in any peptide linkages (thus, HPK only consists of normal Cα-linked peptide bonds).

Ignore the D L configuration. Draw the tri-amino acid chemical structure at pH 13, indicate (with arrow) the psi (ψ) angle of the peptide, the phi angle, circle all charges, the inonizable groups, and label the pKa values used for each group.

Problem 2: One of former Biochemistry 4311-002 students has created a delicious novel curly spaghetti noodle. The pitch for the curly spaghetti noodle is found to be 2.0. Its residue per turn is discovered to be 4.0. We use the Å unit for distance.

(1): show the unit of 'pitch' and 'residue per turn' of the curly spaghetti noodle.

If the answer for either the 'pitch' or 'residue per turn' is wrong, no credit for the question (1), (2) and (3), even if the answers for (2) and (3) are correct.

The unit of pitch:

The unit of residue per turn:

(2): from the given values, set-up the equation to calculate the 'rise per residue' of the curly spaghetti noodle.

(3): show the value of 'rise per residue' of the curly spaghetti noodle with a proper unit.