set4 - Professor: Chris Chang GSIs: Julian Bigi, Sheel...

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Professor: Chris Chang Due: Thursday, Oct 30, 2008 GSIs: Julian Bigi, Sheel Dodani Chemistry 103 Problem Set #4 1) a) Draw the three most common zinc finger motifs. b) Give the metal oxidation state, the d electron count of the metal, and the total electron count for each motif. c) For each of these motifs, predict what color the transcription factors containing these motifs would be. 2) a) Draw the six most common amino acids used as ligands for metal ions and circle the side chains. b) Provide their protonation state at pH 9.5 c) Predict how the pK a of Cys would change when bound to a metal ion. d) Draw chemical structures and crystal field splitting diagrams of [Cu(S-Cys) 4 ] 2- and [Fe(S-Cys) 4 ] - . For each splitting diagram, fill in the correct number of electrons. Which will have higher or lower pK a for Cys? Give your reasoning. 3) Copper forms stable four-coordinate complexes with 1,10-phenanthrolines. a) Explain how you expect the Cu(II)/(I) reduction potentials for [Cu(dmp)
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This note was uploaded on 02/04/2010 for the course CHEM 103 taught by Professor Chang during the Fall '08 term at Berkeley.

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set4 - Professor: Chris Chang GSIs: Julian Bigi, Sheel...

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