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Lecture

BIOCH 200 (January 29, 2014) - Protein Structure and Function

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Department
Biochemistry
Course
BIOCH200
Professor
Walter Dixon
Semester
Winter

Description
BIOCH 200 Protein Structure and Function – Amino Acids (con’t) | (January 29, 2014) Polar Amino Acids • *These amino acids ARE reactive due to functional groups o Side chains contain an electronegative atom  *Exception: glycine • *It’s side chain consists of a hydrogen atom only… therefore, glycine is not a particularly good example of a “polar amino acid” since it is only weakly polar • The glycine molecule is also small and therefore flexible • *Is the only achiral amino acid out of the 20 • SERINE (Ser) o Side chain = -CH 2H  *Participate in H-bond as the H-donor  *-OH can be phosphorylated to yield a charged (-) molecule • THREONINE (Thr) o = serine – H (on side chain) + CH3= -CHCH OH3 o This molecule can also be phosphorylated and acts as a H-donor in H-bonds o *Has 2 chiral carbons • *I-Clicker Question: At a pH value below the pKa value an ionizable group will be
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