BIOS41_Lecture6_01252008

BIOS41_Lecture6_01252008 - to walk along a filament....

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BIOS 41 Biology Core I Cellular and Molecular Spring 2008 Professor J. A. Sands Lecture 6, January 25 Proteins, continued (Chapter 4, pages 143-159)
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04_30_selective binding.jpg The binding of a protein to another molecule is highly selective.
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04_31_specific ligands.jpg Binding sites allow a protein to interact with specific ligands .
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04_32_antibody.jpg An antibody has two identical binding sites for its antigen .
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04_33_Lysozyme.jpg Lysozyme illustrates how an enzyme works. Lysozyme cleaves a polysaccharide chain. In the active site of lysozyme, bonds are bent and broken (details shown in Figure 4-34).
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04_35_Enzymes.jpg Enzymes can encourage catalysis in several ways.
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04_39_conform.change.jpg Binding of a small regulatory molecule can cause a conformational change.
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04_41_phosphorylation.jpg Protein phosphorylation is a common means of regulating protein activity .
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04_42_molec. switches.jpg GTP-binding proteins form molecular switches.
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04_44_walk along.jpg Changes in conformation can allow a protein
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Unformatted text preview: to walk along a filament. 04_45_motor protein.jpg An allosteric motor protein, driven by ATP hydrolysis, moves in one direction. 04_46_Protein machine.jpg Protein machines can carry out complex functions. Large-Scale Studies of Protein Structure and Function Many future advances may come from proteomics , the large scale study of cellular proteins in which the activities or structures of hundreds of proteins are analyzed at once. (We) might someday be able to monitor all of the proteins that are present in a cell in a single experiment (and) to take any amino acid sequence and predict the structure and function of the protein. These powerful techniques should bring us closer to understanding the fundamental basis of living cells: how proteins work together to make it possible to create and maintain order in a universe that is always tending toward disorder. Essential Cell Biology , pgs. 157 & 158 ....
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BIOS41_Lecture6_01252008 - to walk along a filament....

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