CW35-PE - CHM 2046/Myers WORKSHEET 35 PROTEIN EXAMPLES 1...

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CHM 2046/Myers WORKSHEET 35 APR 14, 2010 PROTEIN EXAMPLES 1. ENZYMES are globular proteins that serve as catalysts. They have an “active site,” a cavity that wraps around and temporarily bonds to a reactant (a “substrate”). Enzymes tend to be very specific about what they catalyze. The substrate must fit properly into the active site. Otherwise nothing happens. Lysozyme is an enzyme that helps decompose certain polysaccharides. 2. HEME PROTEINS contain a heme group, a square planar complex. Heme is a complex of porphyrin, a tetradentate chelate, bonded to an Fe +2 ion. The Fe +2 in a heme unit is also bonded the nitrogen of a histidine (his) R group on the protein chain. An O 2 molecule can bond to the Fe +2 , filling in the 6 th position of an octahedral complex. What is remarkable is that the O 2 binds to the Fe +2 reversibly . The O 2 can bind and then be detached. More normally O 2 oxidizes Fe +2 to Fe +3 . The heme chelate and the protein stabilize the Fe +2 d 6 state. Cytochrome C
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CW35-PE - CHM 2046/Myers WORKSHEET 35 PROTEIN EXAMPLES 1...

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