quiz 2 - BIBC 100: Structural Biochemistry Spring 2003 1)...

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Silvia Mah sarmimah@yahoo.com 1 BIBC 100: Structural Biochemistry Practice Quiz 2: ANSWERS Spring 2003 Protein secondary structure 1) What kind of bonds do Cys residues make? Why are these important? Cys residues make disulfide bonds (Fig. 1.4). The Cys residues are oxidized to form the bond. The SH group of the Cys residues are involved in the reaction. These groups are oxidized to form one S-S (disulfide) group. This bond stabilizes tertiary structure of mostly extracellular proteins (Fig. 17.3). 2) Give two examples of helix-loop-helix motifs? What types of residues would you find in the different regions of the motif? DNA-binding motif (Fig. 8.9) and Ca-binding motif (i.e. E-F hand). You would find chaarged residues in the loop region and hydrophobic residues in the alpha helices surrounding the loop of the E-F hand motif (Fig. 2.13 and Table 2.2). 3) Name the three types of secondary beta motifs? Beta-loop-Beta, Greek key, and Beta-loop-alpha-loop-Beta motifs
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quiz 2 - BIBC 100: Structural Biochemistry Spring 2003 1)...

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