3. Amino Acids

Draw the predominate structures of K at the indicated sections of its titration curve. Mark the pI on the curve.

Label each arrow on Asp's titration curve & draw its predominate structure at each colored region.

A) Amino group pK_a.

B) Carboxyl group pK_a.

C) R-group pK_a (pK_a = 3.9).

D) Amino group equivalence point.

E) Carboxyl group equivalence point.

F) R-group equivalence point.

Determine the pI of Glu & mark it on the provided titration curve.

a. 6.96

b. 5.93

c. 7.48

d. 3.22

Use the titration curve to draw the predominate structures of Glu at pH = 1.0, pH = 3.0, pH = 7.0, & pH = 11.0.

Glu at pH = 1.0 Glu at pH = 3.0 Glu at pH = 7.0 Glu at pH = 11.0